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Avaya Configuring LLC Services User's Manual

1. RFC 1490 bridging standard RFC 1490 routing standard SNA mainframe e a V NN e aA V XA N SNA mainframe B UC jm IBM 3745 IBM 3745 6 Communications Communications controller controller running NCP running NCP 7 1 or higher Frame Relay network Frame Relay network E E j Bay Networks router Router removes FR GRE with single switch DLSw Operating as FRAD Ethernet E d SDLC E I 1 een t Router encapsulates l Data in FR headers 1 To remote Sites E 1 H LLC EJ Token Ring m Token Ring i Ss LLC I ES SR over FR End station End station E EX EX LLC0013A Figure 2 6 RFC 1490 Bridging and Routing Standards for SNA 2 12 303533 A Rev 00 LLC2 Routed over Frame Relay For More Information about LLC2 over Frame Relay The following publications give technical detail on LLC2 over Frame Relay Bradley Terry Brown Caralyn and Malis Andrew G Multiprotocol Interconnect over Frame Relay RFC 1490 Wellfleet Communications and Ascom Timplex Inc July 1993 Rao Cherukuri
2. ssssseeeenenne 4 5 LLC2 Interface Configuration Window Bottom sssss 4 5 vii Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 2 1 Table A 1 Table A 2 303533 A Rev 00 Tables LLG Command POUS 2 otra trt e i ex Ri P RR ote 1 9 PDU Format and Function 2 iai pee rero S EERe ebd d da Te pi ER SAEC Eom x dE Ex veta aa 1 13 Control Field Bits and Functions 1 pausd ce uice EMI aiaeeiiee teati 1 15 Command Names and Definitions essssesssesssseeeeeren enn 1 16 Virtual MAC to Frame Relay Topology Tn LEG Global Parameter ascia ta etie atate a rre ers Pea A 1 LEGS Interface Parameters 1 2scexeien in Euren t tlg ce bh FR aA tk Rit RR A 1 Preface This guide describes Logical Link Control LLC services and what you do to start and customize ATM services on a Bay Networks router By customizing your router for LLC services you open your network to LAN Network Manager LNM servers Data Link Switching DLS w services and Advanced Peer to Peer Networking APPN Before You Begin Before using this guide you must complete the following procedures For a new router Install the router see the installation guide that came with your router e Connect the router to the network and create a pilot configuration file see Quick Starting Routers Configuring BayStack Remote Access or Connecting ASN Routers to a Network Make sure t
3. 40 seconds If you increase the Ack Timer for Xmt parameter value then you should consider decreasing the Inactivity Timer parameter value 1 3 6 1 4 1 18 3 5 1 6 2 1 18 Max Links 255 logical connections 4 to 5000 Specifies the maximum number of logically independent end to end connections the local LLC2 interface can allocate Enter any valid number of end to end connections from 4 to 5000 Choose a value that is appropriate for the aggregate performance requirements of all applications this LLC2 interface supports Be aware that higher settings reduce the amount of available memory 1 3 6 1 4 1 18 3 5 1 6 2 1 20 303533 A Rev 00 Editing LLC Parameters Parameter Default Options Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Frame Relay Virtual MAC Address Mask 0x400000FF Octal string This mask specifies the upper 2 to 4 bytes of a virtual destination MAC address The lower remaining bytes specify the DLCI to be used Select a mask that is unique within your network The mask should be the upper 2 to 4 bytes of a standard MSB Token Ring MAC address 1 3 6 1 4 1 18 3 5 1 6 2 1 26 Virtual Ring Number None Ox1 to Oxfff Indicates a ring number for LLC to use if you configure APPN with source route bridging The ring number must be unique in the SRB network Select a hexadecimal number from 0x1 to Oxfff that is unique in
4. Configuring LLC Services BayRS Version 13 00 Site Manager Software Version 7 00 Part No 303533 A Rev 00 October 1998 CES Bay Networks Where Information Flows Bay Networks Where Information Flows 4401 Great America Parkway 8 Federal Street Santa Clara CA 95054 Billerica MA 01821 Copyright 1998 Bay Networks Inc All rights reserved Printed in the USA October 1998 The information in this document is subject to change without notice The statements configurations technical data and recommendations in this document are believed to be accurate and reliable but are presented without express or implied warranty Users must take full responsibility for their applications of any products specified in this document The information in this document is proprietary to Bay Networks Inc The software described in this document is furnished under a license agreement and may only be used in accordance with the terms of that license A summary of the Software License is included in this document Trademarks ACE AFN AN BCN BLN BN BNX CN FRE LN Optivity PPX Quick2Config and Bay Networks are registered trademarks and Advanced Remote Node ANH ARN ASN BayRS BaySecure BayStack BayStream BCC BCNX BLNX EZ Install EZ Internetwork EZ LAN FN IP AutoLearn PathMan RouterMan SN SPEX Switch Node System 5000 and the Bay Networks logo are trademarks of Bay Networks Inc Microsoft MS MS DOS Win32
5. 7 PDUs 1 to 127 Specifies a maximum number of unacknowledged Information PDUs that LLC can receive LLC drops frames it receives outside this window and recovers them via timers Enter any valid value from 1 to 127 LLC PDUs For sessions that do not negotiate XIDs SNA PU 2 0 and NetBIOS set the router Receive Window to the largest endstation s send window If the Receive Window is too small the router discards frames it receives outside this window Timers recover these frames and dropping these frames degrades performance On a mainframe s front end processor the Max Out parameter in the NCP controls the front end s transmit window Therefore if the Max Out in the NCP is set to 127 you should set the router Receive Window to 127 For sessions which negotiate XIDs SNA PU 2 1 the Receive Window sets dynamically during connection establishment The router uses the value specified here as an upper limit and negotiates down Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 22 4 8 303533 A Rev 00 Editing LLC Parameters Parameter Default Range Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Send Window 7 PDUs 1 to 127 Specifies a maximum number of Information PDUs that can be outstanding at any given time The value serves as a default Send window size when no other size ha
6. 2 command PDUs and their counterpart response PDUs Type 1 operations do not include definition of an Acknowledgment PDU Type 2 operations do not include a command PDU counterpart for the FRMR response PDU Table 1 1 LLC Command PDUs Operation Type Command Response Type 1 Unnumbered Information UI No response Exchange Identification XID Exchange Identification XID Test TEST Test TEST continued 303533 A Rev 00 Configuring LLC Services Table 1 1 LLC Command PDUs continued Operation Type Command Response Type 2 Information I Information I Receiver Ready RR Receiver Ready RR Receiver Not Ready RNR Receiver Not Ready RNR Reject REJ Reject REJ Set Asynchronous Balanced Mode Extended SABME Unnumbered Acknowledgment UA Disconnect DISC Disconnected Mode DM No command Frame Reject FRMR LLC Protocol Data Unit Formats The LLC protocol data unit PDU contains fields for addressing control and data as shown in Figure 1 3 This section provides additional information on each field of the LLC PDU DSAP SSAP Control Information Field 8 bits 8 bits 8 or 16 bits Variable 8 bits each packet Figure 1 3 LLC PDU Structure Destination SAP DSAP The DSAP Address field identifies one or more service access points SAPs for which the LLC PDU is intended The
7. 802 2 LLC Data Link MAC Physical Physical LLC0002A Figure 1 2 The LLC Sublayer in the IEEE 802 x and OSI Models You can add an IEEE 802 2 compliant LLC interface to any physical circuit attached directly to an 8802 x 802 x LAN segment Each interface services higher level clients networking protocols and applications and is serviced by lower level protocols media access control MAC and physical layers operating within the router LLC Service Classes The 802 2 LLC recommendations support three service classes e Connectionless Unacknowledged Class 1 or LLC1 1 6 303533 A Rev 00 Logical Link Control Overview e Connection Oriented Class 2 or LLC2 e Connectionless Acknowledged Class 3 or LLC3 Note Bay Networks LLC does not support the LLC3 service class LLC1 Connectionless Service LLC1 is a datagram service that sends and receives LLC frames called link service data units LSDUs without requiring acknowledgment from the peer to assure delivery LLCI supports all forms of communication point to point multipoint multicast and broadcast This service is appropriate for protocols that provide addressing routing recovery and sequencing services at a higher layer LLC2 Connection Oriented Service LLC2 secures a point to point virtual circuit connection between link service access points LSAPs The LLC2 protocol e Responds to a request from a higher level protocol to o
8. a 2 12 For More Information about LLC2 over Frame Relay sssssscesssseeessrinsrsrrreserernessrrnneens 2 13 Chapter 3 Enabling LLC Services Using the Parameter DoschNUODI cin sucscecnesececesnsieccedsenetucrvone pb ree cix P Prada aai 3 1 Enaring ELS on AM Wiehe nariu a petia d e taa Cp ea 3 2 Enabling LLC2 Services over Native Frame Relay eeeseeeeeeeseeeeeeeee OTO aus dd M Dots m 3 4 For PIE NONOKE e 3 5 Chapter 4 Editing LLC Parameters KOM LLG PHISITIBIBES cuestan idee d EY RM d p gb e RA UN MIUV AUC Mens 4 2 Editing b L62 Global Parameters socdutbeniisiaibenisaddentepaioqapE eed od Up aire Editing LLO2 Intertace POTmeglal screenen e EEEE 4 4 Editing Frame Relay PAAR GINS acis aiste dace ted DRE Un ced EXER eset URP ia ER e ott e b c da 4 13 Deleting an LLC2 Interface END ET nome FE Banting LLG2 Inbousd Tanie FIBER Guru cerei te RED qui par ideas 4 14 Deleting LLC2 from the Node acutacsscet ecc esent elo o a CLE Nea 4 14 Appendix A LLC2 Default Settings Index vi 303533 A Rev 00 Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 1 6 Figure 1 7 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 303533 A Rev 00 Figures Sample Frame Relay Network iissee
9. addresses but any application can use a SAP to send or receive data via the LLC sublayer The LLC SAP function sorts frames coming up from the MAC layer and directs them to the appropriate application or protocol software entity Figure 1 6 illustrates some SAPs published for NetBIOS and SNA The xx denotes all other published and unpublished SAPs NetBIOS SNA LAN path network Control Managemt For LAN Used by attached DLSw devices and LLC0005A Figure 1 6 SAPs for LLC Clients 1 12 303533 A Rev 00 Logical Link Control Overview SAP addresses can be e Individual Designates a single SAP The individual address is usable as both an SSAP and a DSAP The individual SAP has an Address Designation bit value of 0 e Group Designates a group of DSAPs The group DSAP has an Address Designation bit value of 1 e Global Designates a group consisting of all DSAPs that the underlying MAC SAP addresses actively service The global DSAP has a value of all 1s e Null Designates the SAP of the underlying MAC sublayer and does not identify any SAP to the network layer or any SAP to an associated layer management function The Null address is usable as both an SSAP and a DSAP The Null SAP has a value of all Os Control Field The Control field consists of one or two octets that designate command and response functions It also contains sequence numbers when required The format of the Control field of the LLC P
10. and other LLC2 clients may be configured on the same physical circuits and therefore share the same LLC interfaces In such cases you can determine a compromise profile of LLC2 parameter settings that satisfy the combined recommendations of the LLC2 clients To access and edit LLC2 interface parameters begin at the Configuration Manager window and proceed as follows 1 Select Protocols gt LLC2 gt Interfaces The LLC2 Interface Configuration window appears Figure 4 3 4 4 303533 A Rev 00 Editing LLC Parameters pullo mmm Do E42 Lice Be lets i lie Sf 11c2 palig Help Erusile Men Octete in LIT Hox Dctetn in I Foe ee belt aches erus bhi rima Hm Retry After Tiedt Figure 4 3 LLC2 Interface Configuration Window Use the scroll bar on the lower right of your screen to view more parameters including Frame Relay Virtual MAC Address Mask Figure 4 4 Frame Relay Virtual HAC Ardress Haski Virtual Ring Haber hex Figure 4 4 LLC2 Interface Configuration Window Bottom 303533 A Rev 00 4 5 Configuring LLC Services The LLC2 Interface Configuration window contains the following information fields e The upper left quarter contains a window that lists all LLC2 interfaces configured on physical circuits belonging to this node This list does not appear in the Edit LLC2 Interface window e The lower left quarter lists parameters you can alter to suit your network configurati
11. balanced mode extended SABME 1 17 test TEST 1 16 unnumbered information UI 1 16 Configuration Manager window 4 2 configuring parameters in PDU control field 1 13 to 1 15 303533 A Rev 00 Index control field formats information T 1 13 to 1 15 supervisory S 1 13 to 1 15 unnumbered U 1 13 to 1 15 control field parameters poll final bit 1 14 1 15 receive sequence number bit 1 14 1 15 send sequence number bit 1 14 1 15 conventions text xii D defaults for LLC2 parameters A 1 deleting LLC2 from a single interface 4 14 from all interfaces 4 14 DLCI choice 3 7 DLCIs mapping to MACs 2 4 to 2 11 documentation additional 1 19 2 13 E educational services xv Enable global parameter 4 3 to 4 4 Enable interface parameter 4 7 enabling LLC services 3 1 enabling LLC2 services 3 2 F FRAD frame relay access device use of in LLC2 2 1 2 4 Frame Relay 1 3 to 1 5 Frame Relay Mappings window 3 6 Index 1 Frame Relay to Frame Relay addressing 2 10 Frame Relay to Physical MAC addressing 2 9 Frame Relay to Virtual MAC addressing 2 7 Frame Relay Virtual MAC Address parameter 4 13 IBM NCP compatibility 2 1 Inactivity Timer parameter 4 12 inbound traffic filters editing 4 14 information field formats 1 18 interface parameters Ack Timer for Xmt 4 10 Busy Timer 4 11 Enable interface 4 7 Frame Relay Virtual MAC Address 4 13 Inactivity Timer 4 12
12. necessary Refer to the description of the Enable parameter which follows this procedure 3 Click on OK to save your change and exit the Edit LLC2 Global Parameters window 303533 A Rev 00 4 3 Configuring LLC Services Parameter Default Options Function Instructions MIB Object ID Enable Enable Enable Disable Globally enables or disables the system software mechanisms that in turn allow or do not allow users to add an LLC2 interface to any 802 x LAN physical circuit You can configure only one LLC2 interface per physical LAN circuit Other significant actions the system software performs when you choose a setting for the LLC Enable parameter include Disable Forces every LLC2 interface on this node into the inoperative down state Enable Reinitializes every LLC2 interface on this node with each interface maintaining the most recent setting of its own interface Enable parameter The actual operating state of each interface further depends on the current up down state of the associated physical circuit Select Disable to force every LLC2 interface existing on this node into the inoperative down state Select Enable only when an existing LLC2 interface is in the Disabled state 1 3 6 1 4 1 18 3 5 1 6 1 2 Editing LLC2 Interface Parameters Use the Configuration Manager to access and customize LLC2 interface parameters for specific clients such as DLSw and LAN Network Manager These
13. per virtual circuit The XID response PDU identifies the responding LLC and conveys to the source LLC The types of LLC services the destination LLC supports The receive window size the destination LLC supports per datalink connection per virtual circuit Test OxF3 The TEST command PDU causes the destination LLC TEST or to respond with the TEST response PDU it performs a OxE3 loopback test of the LLC to LLC transmission paths The TEST command PDU also initiates the establishment of an LLC1 logical link across a network to another LLC entity The TEST response PDU confirms the establishment of an LLC1 link Information I 6xXxx0 The command PDU indicates to the destination LLC or The sequence number for each command PDU xx even The I PDU sequence number the destination LLC expects next The command PDU also serves as an response PDU by indicating to the destination LLC that the source LLC has received PDUs up to a designated number from that destination LLC continued 303533 A Rev 00 Logical Link Control Overview Table 1 4 Command Names and Definitions continued Control Command Field Response Value Definition Receiver Ready 01xx The RR command PDU indicates that the source LLC is RR ready to receive an PDU The sending LLC then considers PDUs sent prior to the RR condition as acknowledged Receiver Not 05xx The RNR command PDU notifies the destination L
14. previously and now want to re enable the interface on its associated LAN physical circuit Select Disable if you want to disable this LLC2 interface on its associated LAN physical circuit 1 3 6 1 4 1 18 3 5 1 6 2 1 2 Max Octets in UI 5128 octets 1 to 5128 Specifies in octets the maximum size of an Unnumbered Information UI PDU this LLC2 interface sends or receives Enter a valid value from 1 octet 8 bits to 5128 octets Choose a value that is appropriate for the applications LLC2 supports The LLC sublayer imposes no restrictions However all MAC sublayers must be capable of accommodating UI PDUs with Information fields up to 128 octets in length 1 3 6 1 4 1 18 3 5 1 6 2 1 6 303533 A Rev 00 4 7 Configuring LLC Services Parameter Default Range Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Max Octets in I 5128 octets 1 to 5128 Specifies in octets the size of an Information I PDU this LLC2 interface sends or receives Enter any valid value from 1 octet 8 bits to 5128 octets Choose a value that is appropriate for the applications LLC2 supports Refer to the various MAC descriptions to determine the precise value you should select for the given medium All MACs must be capable of accommodating I format PDUs with Information fields up to 5128 octets in length 1 3 6 1 4 1 18 3 5 1 6 2 1 9 Receive Window
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16. scitur tto tcn 1 3 Boundary cops Nodo nunnana i pde ceder ca acu RS DA P us adt cad due 1 4 LLO SEO U et NC ANS EE c MEM TN Ie HESS REDI ert Perce eR PrP Terre eee CeE S 1 6 LECT Connectionless BORE secrecion inie e a ataei 1 7 LLC2 Connection Oriented SOPVIQB cascos acsecuur eon somot retis cpoc vasca pur tasso s E esen 1 7 HESSE DINE MTS 1 8 D AT helt M Tdv mE WPO 2 OPaOS carena a E 1 8 EEG FIDON AT Gopi pialussteanutelua ieamtetabinatgaliatalaanaunls 1 9 LLC Protocol Data Unit Formats Lettres TOM T TM pisse pu T d RicuppisiEe sl ibi MS 1 10 SUCE Cre ee SA SAA EESAN RT P 1 11 eene 1 12 pg p Me ERAT D errr DU DU ee 1 13 Control Field Fornmmals sisisi TET E E HATO PEON zr e 1 18 303533 A Rev 00 V For Mare Information about Logical Link Control sia eset er d rur eR Ri 1 19 Chapter 2 LLC2 Routed over Frame Relay Mes eil Ez DEM i 2 1 Compatibility with IBM NCP 7 1 and Higher eaae sesenta e ntantnakennin 2 1 gioi iar idi dE memet RE o t oT E 2 4 Mapping DLCIS T3 MAC AddrossoS acra pr RA tana aa AM Rer exee 2 4 Router Mapping 22 018 He em enii face eenniarre rere sree a pranrn Tracer Ts 2 5 Virtual MAC to Frame acria tO mm 2 6 Frame Relay to DIU MAG m 2 7 Physical MAC to Frame Rolay e PT c 2 8 Frame Relay to Physical MAC areae cupi peace buez tp p bue turbae cH pRP Pea eaaa 2 9 Frame Relay t Frame Polay ee UT 2 10 LLC2 over Frame Relay Routed versus Bridged eese
17. terminating the LLC2 session at the router and providing a local acknowledgment to SNA NetBIOS workstations The LLC2 subsystem provides these services The Bay Networks implementation of the LLC protocol consists of LLC Class 1 LLC1 a connectionless service and LLC Class 2 LLC2 a connection oriented service The subsystems that require LLC2 services are e DLSw APPN LAN Network Manager LNM Most other protocols use LLCI or connectionless delivery services Generally there is no need to change the LLC2 default settings in Site Manager However you can tune the network by changing these default settings In Site Manager you should not select LLC2 on an interface without also selecting one of the preceding protocols 303533 A Rev 00 1 1 Configuring LLC Services Using LLC2 with SNA and NetBIOS SNA needs a connection oriented datalink layer for end to end packet sequencing and error control Over wide area networks WANs the Synchronous Data Link Control SDLC protocol has traditionally met this need However in a LAN environment front end processors FEPs controllers and NetBIOS client server stations commonly use an LLC2 layer for this purpose To support communication among these devices you can add LLC2 interfaces to a router configuration SNA devices and NetBIOS PCs use LLC when they establish sessions through a LAN topology SNA and NetBIOS need LLC2 connection oriented circuits to provide higher
18. the destination MAC address equal to the local MAC address from the mapping table Router B always sets the source MAC address equal to the virtual MAC address even if there is a remote MAC address configured in the mapping table Note This mapping does not work with applications that check the source MAC address against configured remote host addresses 303533 A Rev 00 2 9 Configuring LLC Services Configuration at PC Remote host 1 400000000001 Remote host 2 400000000002 PC MAC 400000000003 DLCI 100 Token Ring Frame Relay UL IT DLCI 101 DLSw m i Router A Router B Connection request Mapping Table for Router B Remote MAC Local MAC DLCI Source MAC smac virtual 400000000003 100 Destination MAC dmac 400000000003 400000000003 101 LLC0011A Figure 2 4 Frame Relay to Physical MAC Topology Frame Relay to Frame Relay Figure 2 5 illustrates a sample Frame Relay DLCI to Frame Relay DLCI mapping In this network the PC makes connection requests to both Host 1 and Host 2 The workstation administrator has configured the PC with Remote Host 1 and Remote Host 2 equal to the assigned DLCIs Router A requires a mapping table to map Remote Host 1 and 2 DLCIs to a virtual MAC address corresponding to Host 1 or Host 2 DLCI Router creates a connection request with th
19. 00000F F0064 4000000000038 Figure 3 6 LLC2 Frame Relay Mapping Add Window 5 Specify the DLCI Remote MAC and Local MAC parameters as follows Parameter Default Options Function Instructions MIB Object ID DLCI None Standard Data Link Connection Identifier numbers Provides the number of the virtual circuit to which you are mapping the local or remote MAC address Enter a decimal DLCI number assigned by your system administrator or Frame Relay provider 1 3 6 1 4 1 18 3 5 1 6 9 1 3 303533 A Rev 00 3 7 Configuring LLC Services Parameter Remote MAC Default None Options Standard MSB Token Ring MAC addresses Function Provides the remote MAC address mapping outgoing requests to the DLCI value The remote MAC address must be unique with only DLCI mapping for a specific MAC address Instructions If you need to specify the real hardware address of the host enter it as an MIB Object ID octal string 1 3 6 1 4 1 18 3 5 1 6 9 1 5 Parameter Local MAC Default None Options Standard MSB Token Ring MAC addresses Function This parameter provides the local MAC address mapping incoming requests on this DLCI to that address The local MAC address must be unique with only DLCI mapping for a specific MAC address Instructions If the incoming connections are valid enter the MAC address of the MIB Object ID recipient 1 3 6 1 4 1 18 3 5 1 6 9 1 4 6 Click on OK The Configurat
20. DSAP field contains 7 bits of actual address and 1 Address Designation bit to indicate an Individual I destination address or a Group G destination address as shown in Figure 1 4 303533 A Rev 00 Logical Link Control Overview Address designation bit DDDDDDD V G LLC0003A Figure 1 4 DSAP Address Field e A value of 0 for the Address Designation bit indicates that the PDU is destined for an individual SAP e A value of 1 for the Address Designation bit indicates that the PDU is destined for a group level SAP Source SAP SSAP The SSAP Address field identifies the specific service access point that initiated the PDU The SSAP field contains 7 bits of actual address and 1 Command Response Identifier bit to indicate that the LLC PDU is a Command C PDU or a Response R PDU as shown in Figure 1 5 Command response identifier bit SSSSSSS C R LLC0004A Figure 1 5 SSAP Address Field 303533 A Rev 00 1 11 Configuring LLC Services e A value of 0 for the Command Response Identifier bit indicates that the PDU is a Command PDU e A value of 1 for the Command Response Identifier bit indicates that the PDU is a Response PDU SAP Addressing Scheme All of the 802 2 LLC protocols provide a SAP addressing scheme that lets multiple applications and protocol entities in a single machine share a MAC address Popular network protocols such as LAN Network Manager NetBIOS and SNA all have published SAP
21. DU defines the type of operation Type 1 versus Type 2 Information an I format PDU e Supervisory an S format PDU Unnumbered a U format PDU Figure 1 7 shows the three Control field formats 303533 A Rev 00 1 13 Configuring LLC Services format PDU Information Transfer Commands Responses S format PDU Supervisory Commands Responses U format PDU Unnumbered Commands Responses Send Sequence Number Receive Sequence Number Supervisory function bit Modifier function bit Reserved and set to zero Poll Final bit LLC0006A Figure 1 7 LLC PDU Control Field Format Control Field Formats Table 1 2 further defines the purpose of the three PDU types where the specific format in the PDU Control field determines the type 1 14 303533 A Rev 00 Logical Link Control Overview Table 1 2 PDU Format and Function Format Function Information The format PDU performs a numbered information transfer in Type Transfer 2 operation Except for the Ul TEST FRMR and XID command Format I response PDUs the format PDU is the only LLC PDU that can contain an Information field Refer to Information Field later in this chapter for more details Supervisory The S format PDU performs datalink supervisory control functions in Format S Type 2 operation such as acknowledging format PDUs requesting retransmission of format PDUs and requesting a temporary suspension of transmiss
22. IES AND ARE IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Licensee is responsible for the security of 303533 A Rev 00 iii its own data and information and for maintaining adequate procedures apart from the Software to reconstruct lost or altered files data or programs 4 Limitation of liability IN NO EVENT WILL BAY NETWORKS OR ITS LICENSORS BE LIABLE FOR ANY COST OF SUBSTITUTE PROCUREMENT SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES RESULTING FROM INACCURATE OR LOST DATA OR LOSS OF USE OR PROFITS ARISING OUT OF OR IN CONNECTION WITH THE PERFORMANCE OF THE SOFTWARE EVEN IF BAY NETWORKS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN NO EVENT SHALL THE LIABILITY OF BAY NETWORKS RELATING TO THE SOFTWARE OR THIS AGREEMENT EXCEED THE PRICE PAID TO BAY NETWORKS FOR THE SOFTWARE LICENSE 5 Government Licensees This provision applies to all Software and documentation acquired directly or indirectly by or on behalf of the United States Government The Software and documentation are commercial products licensed on the open market at market prices and were developed entirely at private expense and without the use of any U S Government funds The license to the U S Government is granted only with restricted rights and use duplication or disclosure by the U S Government is subject to the restrictions set f
23. LC Ready that the originating LLC is busy and temporarily unable RNR to receive PDUs RNRs combined with RRs control flow between source and destination LLC interfaces Reject 09xx The REJ command PDU conveys a request to the peer REJ LLC to retransmit PDUs starting with the PDU that the REJ command designates Set 7F The SABME command PDU establishes an LLC2 Asynchronous or connection to the destination LLC The connection Balanced Mode 6F operates in asynchronous balanced mode Extended SABME If the destination LLC receives from its network layer a DataLink Connect request the destination LLC responds to the SABME PDU with a UA PDU If the destination LLC receives from its network layer a DataLink Disconnect request it does not send a UA PDU Disconnect 53 The DISC response PDU closes an open connection by DISC or initiating a SABME command The DISC PDU informs 43 the destination LLC that the source LLC is suspending the datalink connection and the destination LLC should assume the Disconnected Mode Prior to acting on the DISC command the destination LLC must confirm the acceptance of the DISC command PDU by sending a UA response PDU PDUs sent previously but not acknowledged remain unacknowledged continued 303533 A Rev 00 Configuring LLC Services Table 1 4 Command Names and Definitions continued Control Command Field Response Value Definition Unnumbered 73 Th
24. Max Links 4 12 Max Octets in I 4 8 Max Octets in UI 4 7 Max Retry After Time Out max number of transmissions 4 9 Receive Window 4 8 Reject Timer 4 11 Send Window 4 9 Virtual Ring Number 4 13 L LLC parameters descriptions of 3 1 LLC2 defaults A 1 LLC2 Frame Relay Mappings window 3 6 LLC2 Global Parameters window 4 3 LLC2 Interface Configuration window 4 4 Logical Link Control LLC and SNA protocols 1 2 classes of service in 1 6 to 1 8 functionality of 1 9 overview of 1 1 to 1 19 protocols requiring 1 1 types of operations in 1 8 to 1 18 Index 2 MAC addresses real and virtual 2 4 mapping DLCIs to MAC addresses 2 4 to 2 11 mask for frame relay MAC address 4 13 Max Links parameter 4 12 Max Octets in I parameter 4 8 Max Octets in UI parameter 4 7 Max Retry After Time Out parameter max number of transmissions 4 9 N NCP compatibility 2 1 Oo operation types numbered acknowledged type 2 1 8 to 1 18 unnumbered unacknowledged type 1 1 8 to 1 18 overview of LLC services supported 1 1 to 1 19 P parameters Ack Timer for Xmt 4 10 Busy Timer 4 11 DLCI 3 7 editing 4 1 to 4 13 Enable global 4 4 Enable interface 4 7 Frame Relay Virtual MAC Address Mask 4 13 Inactivity Timer 4 12 Local MAC 3 8 Max Links 4 12 Max Octets in I 4 8 Max Octets in UI 4 7 Max Retry After Time Out max number of transmissions 4 9 Receive Window 4 8 Reject Time
25. PDU sent during the timer window A response PDU with the F bit set Enter a valid value from 1 to 15 The default value 1s works with most environments but may be too small if the LLC connection is over Frame Relay a source route network with multiple hops or if the endstation responds slowly to I Frames Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 13 4 10 303533 A Rev 00 Editing LLC Parameters Parameter Default Range Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Reject Timer ls to 30 Specifies the amount of time in seconds during which the local LLC expects to receive a reply to a REJ PDU Frame Reject response PDU If the Reject timer expires and no reply has been received for the REJ PDU sent by the local LLC the local Reject timer restarts and LLC retransmits the REJ PDU The total number of times that a specific REJ PDU can be retransmitted depends on the setting of the Max Retry After TimeOut parameter Enter any valid value from 1 to 30 The default value 1s works with most environments but may be too small if the LLC connection is over Frame Relay a source route network with multiple hops or if the endstation responds slowly to I Frames Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 14 Busy Tim
26. R SRB WAN Frame Relay Access Device Institute of Electrical and Electronic Engineers International Standards Organization Local Area Network Logical Link Control LAN Network Manager Link Service Access Point least significant bit Link Service Data Unit Media Access Control most significant bit Network Communications Program Network Basic Input Output System Open Systems Interconnection Protocol Data Unit Request for Comment Service Access Point Synchronous Data Link Control Systems Network Architecture source routing source route bridging wide area network xiv 303533 A Rev 00 Preface Bay Networks Technical Publications You can now print Bay Networks technical manuals and release notes free directly from the Internet Go to support baynetworks com library tpubs Find the Bay Networks product for which you need documentation Then locate the specific category and model or version for your hardware or software product Using Adobe Acrobat Reader you can open the manuals and release notes search for the sections you need and print them on most standard printers You can download Acrobat Reader free from the Adobe Systems Web site www adobe com You can purchase Bay Networks documentation sets CDs and selected technical publications through the Bay Networks Collateral Catalog The catalog is located on the World Wide Web at support baynetworks com catalog html and is divided into sections arranged al
27. The description covers both bridging and routing standards The Bay Networks router implementation of LLC exceeds RFC 1490 SNA encapsulation in Frame Relay only by complying with the Frame Relay Forum s Protocol Encapsulation over Frame Relay Implementation Agreements The latter description not only defines how routed SNA traffic traverses a Frame Relay network but also adds RFC 1490 support for Frame Relay to DLSw and APPN This feature allows native SNA traffic originating from SDLC Token Ring or Ethernet attached devices to communicate over public or private Frame Relay networks directly with IBM 3745 or 3746 communications controllers It operates on all Bay Networks routers that include a Frame Relay interface Devices can communicate with intermediate routing nodes or in a single switch configuration similar to a standalone Frame Relay Access Device FRAD Compatibility with IBM NCP 7 1 and Higher LLC2 routed over Frame Relay is fully compatible with IBM NCP 7 1 and higher and with existing or new IBM equipment The service has passed IBM interoperability testing You can use it without upgrading your LAN based downstream physical units DSPUs or network type such as APPN or IP 303533 A Rev 00 2 1 Configuring LLC Services DSPUs attached to the router retain full visibility for IBM NetView management The router passes through all NetView commands for the DSPUs and any Alerts generated by the DSPUs You can conf
28. Windows and Windows NT are registered trademarks of Microsoft Corporation All other trademarks and registered trademarks are the property of their respective owners Restricted Rights Legend Use duplication or disclosure by the United States Government is subject to restrictions as set forth in subparagraph c 1 i1 of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 Notwithstanding any other license agreement that may pertain to or accompany the delivery of this computer software the rights of the United States Government regarding its use reproduction and disclosure are as set forth in the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 Statement of Conditions In the interest of improving internal design operational function and or reliability Bay Networks Inc reserves the right to make changes to the products described in this document without notice Bay Networks Inc does not assume any liability that may occur due to the use or application of the product s or circuit layout s described herein Portions of the code in this software product may be Copyright O 1988 Regents of the University of California AII rights reserved Redistribution and use in source and binary forms of such portions are permitted provided that the above copyright notice and this paragraph are duplicated in all such forms and that any documentation advertising materials and other materials
29. ame Relay interface e Use the endstation s physical or locally configured MAC address In this case be aware that if you change your hardware or endstation configuration you have to reconfigure the DLCI mapping table 2 4 303533 A Rev 00 LLC2 Routed over Frame Relay When the router receives an LLC frame from the DLSw network with a dmac not starting with the virtual MAC mask the mapping table at the Frame Relay interface translates the dmac into a DLCI SDLC single switched over LLC does not require address mapping if a virtual MAC address is used to access the host But you still have to define DLCIs Usually you configure only the remote MAC in the mapping table setting it equal to the remote host MAC address A host may be an IBM mainframe You must configure the local MAC in the mapping table only if the Frame Relay interface receives connection requests Usually only local workstation nodes will request a connection so you configure only the remote MAC address Router Mapping Examples Some sample network configurations with associated mapping tables follow including e Virtual MAC to Frame Relay e Frame Relay to Virtual MAC e Physical MAC to Frame Relay e Frame Relay to Physical MAC Frame Relay to Frame Relay Although these network configurations illustrate topologies with two routers the same principles apply for DLSw operating in single switch mode Instead of configuring a single interface on each rout
30. at the Configuration Manager window Figure 4 1 and select the Protocols LLC2 menu path local LOCAL FILE 1 tmp mnt usrz Backin Link F wH 00 Description EI Gerd Syme T H5 Quad Ethernet Empty Siar Empty Slot EL Mo aM le Figure 4 1 Configuration Manager Window Alternatively you can access LLC parameter windows by highlighting a circuit in the Configuration Manager window and then selecting Edit Circuit to invoke the Circuit Definition window This window is described in Configuring and Managing Routers with Site Manager Use the LLC Circuit menu to access LLC parameters You can select either LLC1 Circuit or LLC2 Circuit from either menu If you select LLC1 from the menu the screen displays a list of interfaces that use LLC1 only such as Source Routing Bridge If you select LLC2 the screen displays a list of interfaces that require the services of LLC2 such as APPN DLS w and the LNM Servers 4 2 303533 A Rev 00 Editing LLC Parameters Editing LLC2 Global Parameters Only the Enable parameter is visible at the global router level for LLC To change the setting of the Enable parameter begin at the Configuration Manager window Figure 4 1 and proceed as follows 1 Select Protocols LLC2 Global The Edit LLC2 Global Parameters window appears Figure 4 2 Cancel E 3 Figure 4 2 Edit LLC2 Global Parameters Window 2 Change the Enable parameter to Disable if
31. cqniemii m emm RE REL ERR Hp c oe RR RR 1 5 The LLC Sublayer in the IEEE 802 x and OSI Models 1 6 LEG IBI 1 10 DSAP Address Field iuicsuiesst uu Mica abbace d ista SER nc nA LAUR 1 11 SSAP Address Field i Qa E n a IO LLG GITE C 1 12 LLG PDU Control Field Format iussisse trae bnt 1 14 Sample Frame Relay Network Using LLC2 eeessesss 2 3 Frame Relay to Virtual MAG Topology iisessextiisse teni erre nets nta dos ceto 2 7 Physical MAC to Frame Relay Topology seen 2 8 Frame Relay to Physical MAC Topology eene 2 10 Frame Relay to Frame Relay Topology esee 2 11 RFC 1490 Bridging and Routing Standards for SNA 2 12 Select Protocols Window LLG DUNT ucsissikeesce bp rapi e ci eae 3 2 WAN Protocols Window Frame Relay ssssssseeee 3 3 Gelect deines WINdOW M M 3 4 source Route Encapsulation Dialog BOX n nnne 3 4 LLC2 Frame Relay Mappings Window eeeeeeeeeeeseeess 9 70 LLC2 Frame Relay Mapping Add Window eeeeeeeese 3 7 LLC2 Frame Relay Mappings Window with DLCI Added 3 9 Configuration Manager Window ER pibus a Edit LLC2 Global Parameters WINdOW Lucena rantes 4 3 LLC2 Interface Configuration Window
32. d the remote host addresses as virtual MAC addresses corresponding to the DLCIS assigned to the hosts At Router B a mapping table maps the Host 1 and Host 2 DLCIs to the PC MAC address Router B first creates a connection request with the source MAC addresses equal to the virtual MAC address corresponding to the Host 1 and Host 2 DLCIs Router B then creates a connection request with the destination MAC equal to the local MAC address from the mapping table Router B always sets the source MAC address equal to the virtual MAC address even if there is a remote MAC address configured in the mapping table Configuration at PC Remote Host 1 400000FF0064 64 Hex 100 Decimal Remote Host 2 400000FF0065 65 Hex 101 Decimal PC MAC 400000000003 DLCI 100 Frame Relay LJ e prio 101 Token Ring Router A loc Router B Connection request Mapping Table for Router B DLCI Remote MAC Local MAC Source MAC smac virtual 100 400000000003 Destination MAC dmac 400000000003 101 400000000003 LLC0009A Figure 2 2 Frame Relay to Virtual MAC Topology 303533 A Rev 00 2 7 Configuring LLC Services Physical MAC to Frame Relay Figure 2 3 illustrates a sample physical MAC address to Frame Relay DLCI mapping In this network the PC makes connection requests to Host 1 and Host 2 The workstation administrator does not have control over the PC co
33. derivative works from the Software or user manuals or any copy in whole or in part Except as expressly provided in this Agreement Licensee may not copy or transfer the Software or user manuals in whole or in part The Software and user manuals embody Bay Networks and its licensors confidential and proprietary intellectual property Licensee shall not sublicense assign or otherwise disclose to any third party the Software or any information about the operation design performance or implementation of the Software and user manuals that is confidential to Bay Networks and its licensors however Licensee may grant permission to its consultants subcontractors and agents to use the Software at Licensee s facility provided they have agreed to use the Software only in accordance with the terms of this license 3 Limited warranty Bay Networks warrants each item of Software as delivered by Bay Networks and properly installed and operated on Bay Networks hardware or other equipment it is originally licensed for to function substantially as described in its accompanying user manual during its warranty period which begins on the date Software is first shipped to Licensee If any item of Software fails to so function during its warranty period as the sole remedy Bay Networks will at its discretion provide a suitable fix patch or workaround for the problem that may be included in a future Software release Bay Networks further warrants to Licensee tha
34. e 1 License Grant Bay Networks Inc Bay Networks grants the end user of the Software Licensee a personal nonexclusive nontransferable license a to use the Software either on a single computer or if applicable on a single authorized device identified by host ID for which it was originally acquired b to copy the Software solely for backup purposes in support of authorized use of the Software and c to use and copy the associated user manual solely in support of authorized use of the Software by Licensee This license applies to the Software only and does not extend to Bay Networks Agent software or other Bay Networks software products Bay Networks Agent software or other Bay Networks software products are licensed for use under the terms of the applicable Bay Networks Inc Software License Agreement that accompanies such software and upon payment by the end user of the applicable license fees for such software 2 Restrictions on use reservation of rights The Software and user manuals are protected under copyright laws Bay Networks and or its licensors retain all title and ownership in both the Software and user manuals including any revisions made by Bay Networks or its licensors The copyright notice must be reproduced and included with any copy of any portion of the Software or user manuals Licensee may not modify translate decompile disassemble use for any competitive analysis reverse engineer distribute or create
35. e UA response PDU acknowledges the receipt and Acknowledg me or acceptance of a SABME or DISC command PDU nt 63 relating to a specific datalink connection to be opened UA or closed as appropriate for the type of command PDU it has received Disconnected 1F The DM response PDU indicates that the LLC sending Mode DM or the response is logically disconnected from the datalink OF connection Frame Reject 97 The FRMR command PDU reports to the sending LLC FRMR or that an uncorrectable condition was detected in a 87 received frame The FRMR PDU includes an information field that indicates the reason for the PDU rejection The LLC receiving the FRMR PDU Initiates the appropriate mode setting Initiates corrective action by reinitializing transmission in both directions on the datalink connection using the SABME and DISC command PDUS as appropriate Information Field The contents of the Information field depend on the type of PDU in which it appears as follows e The Information field of an I format PDU contains only user data e The Information field of a UI command response PDU also contains only user data e The Information field of a TEST command response PDU is optional and contains a test pattern used for LLC loopback testing e The Information field of an XID command response PDU contains An 8 bit XID format identifier field A 16 bit parameter field encoded to identify the LLC services
36. e source MAC address equal to the virtual MAC address corresponding to the Remote Host 1 or 2 DLCI Router B creates a connection request with the destination MAC address equal to the local MAC address from the mapping table 2 10 303533 A Rev 00 LLC2 Routed over Frame Relay Router A always sets the source MAC address equal to the virtual MAC address even if there is a remote MAC address configured in the mapping table Remote host 1 DLC 102 Remote host 2 DLCI 103 DLCI 100 100 decimal 64 hex Frame Relay JL C L DLCI 101 inl 101 decimal Router A B e Router B 65 hex Mapping Table for Router A DLCI Local MAC 102 400000FF0064 103 400000FF0065 No mapping Source MAC smac virtual Destination MAC dmac 400000FF0064 or 400000FF0065 LLC0012A Figure 2 5 Frame Relay to Frame Relay Topology 303533 A Rev 00 Configuring LLC Services LLC2 over Frame Relay Routed versus Bridged Figure 2 6 illustrates a SNA over Frame Relay with source route bridging and b SNA over Frame Relay in native mode including routing through SDLC and Ethernet The Frame Relay link can be part of an alternate route to the Token Ring or other link Dotted lines indicate the path of LLC which is passed through bridging but terminated at the router for more flexible routing
37. echnician Interface does not verify that the value you enter for parameter is valid Entering an invalid value can corrupt your configuration Enabling LLC2 on an Interface To enable LLC2 on an interface select LLC2 from the Select Protocols window Figure 3 1 Figure 3 1 Select Protocols Window LLC only This menu appears after you select a link or network module connector to which you are configuring LLC2 For other than Frame Relay configurations you need not specify any additional configuration information The system software provides default LLC2 services To change the operating parameters of the default service refer to Chapter 4 3 2 303533 A Rev 00 Enabling LLC Services Enabling LLC2 Services over Native Frame Relay If you are configuring and enabling Frame Relay on LLC2 media Configuration Manager displays a set of screens that allow you to start LLC2 and related services such as APPN and DLSw Perform the following steps 1 Select Frame Relay from the WAN Protocols menu Figure 3 2 2 Click on OK WAN Protocols Standard PassThru Frame Relay X uo 2 ATM DXI LAPB only SMDS SDLC Oo I v m Figure 3 2 WAN Protocols Window Frame Relay The Select Protocols window appears Figure 3 3 303533 A Rev 00 3 3 Configuring LLC Services Figure 3 3 Select Protocols Window For APPN Networks 1 Select APPN from the Select Protocols wind
38. ed Multiprotocol Encapsulation Implementation Agreement FRE Frame Relay Forum 303533 A Rev 00 2 18 Chapter 3 Enabling LLC Services This chapter describes how to enable LLC services It assumes that you have read Configuring and Managing Routers with Site Manager and that you have completed the following steps 1 Opened a configuration file 2 Specified router hardware if this is a local mode configuration file 3 Selected the connector on which you are enabling LLC When you enable LLC over Frame Relay with APPN and DLSw networks you must specify the Frame Relay mapping parameters yourself while the Configuration Manager sets default values for all the rest If you want to modify LLC parameters refer to Chapter 4 See Appendix A for a quick reference to the default LLC parameter settings Using the Parameter Descriptions Each LLC parameter description provides information about default settings valid parameter options the parameter function instructions for setting the parameter and the Management Information Base MIB object ID The Technician Interface allows you to modify parameters by issuing set and commit commands with the MIB object ID This process is equivalent to modifying parameters using Site Manager For more information about using the Technician Interface to access the MIB refer to Using Technician Interface Software 303533 A Rev 00 3 1 Configuring LLC Services Caution The T
39. ed acknowledged type 2 1 8 to 1 18 unnumbered unacknowledged type 1 1 8 to 1 18 V virtual MAC address mask 4 13 Virtual MAC to Frame Relay mapping 2 6 Virtual Ring Number parameter 4 13 Index 3
40. er 60 s to 60 Specifies the amount of time in seconds during which the local LLC waits for an indication from a remote LLC that it is ready to receive PDUs from the local LLC The busy condition at the remote LLC has been cleared If the remote Busy timer expires and no indication has been received that the remote busy condition has been cleared the remote Busy timer restarts and LLC again waits either for the remote busy cleared indication or for expiration of the remote Busy timer interval Enter any valid value from 1 to 60 Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 15 303533 A Rev 00 Configuring LLC Services Parameter Default Range Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Inactivity Timer 30s 1 to 30 Specifies the amount of time in seconds during which the local LLC expects to receive a PDU soliciting the status of the remote If the Inactivity timer expires the local LLC sends an S format PDU with the P bit set to solicit the status of the remote It initiates the Ack timer to handle retries Enter any valid value from 1 to 30 This timer detects when an endstation no longer responds The router uses the following formulas to recognize a non responding LLC endstation Inactivity Timer Ack Timer for Xmt Max Retry After TimeOut Defaults 30 1 10
41. er you configure two interfaces on a single router 303533 A Rev 00 2 5 Configuring LLC Services Virtual MAC to Frame Relay Figure 2 1 illustrates a sample virtual MAC address to Frame Relay DLCI mapping In this illustration the PC makes connection requests to Host 1 and Host 2 The workstation administrator has control over the PC configuration and has configured the remote host addresses as virtual MAC addresses corresponding to the DLCIS assigned to the hosts Configuring the PC in this way simplifies the router configuration because a mapping table is not necessary in the Frame Relay attached Router B The connection request received at Router A will have a source MAC address of the PC MAC and a destination MAC address of Remote Host 1 or 2 Host Frame Relay network Single switch DLSw DLSw Bay Networks router TCP IP Client Client Bay Networks router Token Ring DLS0007A Table 2 1 Virtual MAC to Frame Relay Topology 2 6 303533 A Rev 00 LLC2 Routed over Frame Relay Frame Relay to Virtual MAC Figure 2 2 illustrates a sample Frame Relay DLCI to virtual MAC address mapping In this network Host 1 and Host 2 can make connection requests to the PC The workstation administrator has control over the PC configuration and has configure
42. hat you are running the latest version of Bay Networks BayRS and Site Manager software For information about upgrading BayRS and Site Manager see the upgrading guide for your version of BayRS 303533 A Rev 00 xi Configuring LLC Services Text Conventions This guide uses the following text conventions angle brackets gt bold text braces brackets ellipsis points Indicate that you choose the text to enter based on the description inside the brackets Do not type the brackets when entering the command Example If the command syntax is ping ip address you enter ping 192 32 10 12 Indicates text that you need to enter and command names and options Example Enter show ip alerts routes Example Use the dinfo command Indicate required elements in syntax descriptions where there is more than one option You must choose only one of the options Do not type the braces when entering the command Example If the command syntax is show ip alerts routes you must enter either show ip alerts or show ip routes Indicate optional elements in syntax descriptions Do not type the brackets when entering the command Example If the command syntax is show ip interfaces alerts you can enter either show ip interfaces or show ip interfaces alerts Indicate that you repeat the last element of the command as needed Example If the command syntax is ethernet 2 1
43. igure a network without a router at the host if the communications controller is directly attached to a Frame Relay network Some terminals can also connect directly to the Frame Relay network without a router Frame Relay networks save the expense of leased lines Additional savings accrue because one port on a communications controller can support hundreds of data link connection identifiers DLCIs Bay Networks interoperates with NCP 7 1 and higher with software only eliminating the need for any new hardware or upgrades to existing SNA terminals or router equipment Figure 2 1 illustrates the connection of an SNA host through a Frame Relay network in a configuration with multiprotocol traffic to other locations LLC can also route SDLC and Ethernet traffic in addition to APPN Token Ring and IP traffic 2 2 303533 A Rev 00 LLC2 Routed over Frame Relay SNA host e XN IBM Communications controller with NCP No router required Frame Relay network Bay Networks router with DLSw or APPN Token Ring LLC007A Figure 2 1 Sample Frame Relay Network Using LLC2 303533 A Rev 00 2 3 Configuring LLC Services FRAD like Functionality Token Ring Ethernet and SDLC endstations communicate with a Frame Relay attached host via Frame Relay Access Devices FRADs The Bay Networks ro
44. ion Manager returns to the LLC2 Frame Relay Mappings window showing the added circuit Figure 3 7 3 8 303533 A Rev 00 Enabling LLC Services a LLC2 Frame Relay Mappings 852 DLCI 101 Delete Apply Values Help a Remote MAC Ox400000F F0064 f Local MAC 000000900 0 Figure 3 7 LLC2 Frame Relay Mappings Window with DLCI Added 7 Select Apply Repeat Steps 4 through 6 for additional mappings If you are finished select Done You return to the series of layered windows 8 Fillin any subsequent DLSw layered windows Refer to Configuring DLSw Services for information 303533 A Rev 00 3 9 Chapter 4 Editing LLC Parameters You can edit the parameters for the LLC interfaces that you configure on the router Note To edit LLC parameters you must first configure at least one LLC interface on the router To configure an LLC interface or to add additional LLC interfaces see Configuring and Managing Routers with Site Manager You can configure only one LLC2 interface per physical circuit with native mode and source route bridging with routed Frame Relay you can add more depending on your system s resources When you configure an LLC2 interface on an 802 x LAN physical LAN attachment circuit you supply information required by the MAC and LLC sublayers 303533 A Rev 00 4 1 Configuring LLC Services Configuring LLC Parameters To access and edit LLC parameters begin
45. ion of format PDUs Unnumbered The U format PDU is available for Type 1 or Type 2 operations and Format U provides additional datalink control functions and unsequenced information transfer Table 1 3 further defines the purpose of parameter bits in the PDU Control field Table 1 3 Control Field Bits and Functions Bit Function Send Only PDUs contain N S which is the sequence number of the PDU Sequence being transmitted Number N S Bit Receive Sequence Number N R Bit PDUs contain N R which is the sequence number of the PDU an LLC expects to receive next on the specified datalink connection Poll Final P F Bit The P F bit solicits polls a response from the addressed LLC The Final F bit indicates the response PDU sent as a result of a soliciting poll command 303533 A Rev 00 Configuring LLC Services Table 1 4 further defines the purpose of each command and response PDU Table 1 4 Command Names and Definitions Control Command Field Response Value Definition Unnumbered 0x13 Transports information to one or more LLCs Since this Information UI or is a Type 1 operation there is no corresponding 0x03 response reply PDU Exchange OxBF The XID command PDU conveys to the destination LLC Identification or The types of LLC services the source LLC supports XID OxAF The receive window size the source LLC supports per datalink connection
46. layer sequencing and error control in bridged LAN environments LLC2 works much like SDLC in terms of packet sequencing and acknowledgment Unlike SDLC it does not impose unbalanced primary secondary relationships between communicating nodes Any LLC station can initiate a peer to peer conversation with any other LLC station Supported Connections You configure LLC2 on any interface requiring local termination These interfaces include Interfaces configured with APPN e Interfaces configured with DLSw When you connect over an IP backbone in dual switch DLSw configurations the interface attached to the IP backbone does not use LLC2 When you connect over an LLC2 backbone in DLSw single switch configurations the interface attached to the backbone uses LLC2 Token Ring interfaces running LNM You can enable LLC2 on any LAN or WAN interface that supports APPN DLSw and LNM These interfaces include LAN interfaces Token Ring Ethernet Any other LAN media supporting Source Route Bridge including FDDI 303533 A Rev 00 Logical Link Control Overview e WAN interfaces Frame Relay Boundary Network Node BNN and Boundary Access Node BAN interfaces Any other WAN media supporting Source Route Bridge SRB traffic including Point to Point PPP Frame Relay Support Figure 1 1 illustrates the connection of a host through a Frame Relay network in a configuration with multiprotocol traffic to other locati
47. lt parameter gt value you enter ethernet 2 1 and as many parameter value pairs as needed xii 303533 A Rev 00 Preface Acronyms italic text Screen text separator gt vertical line ANSI APPN DLCI DLSw DSPU FDDI FEP FR Indicates file and directory names new terms book titles and variables in command syntax descriptions Where a variable is two or more words the words are connected by an underscore Example If the command syntax is show at lt valid_route gt valid_route is one variable and you substitute one value for it Indicates system output for example prompts and system messages Example Set Bay Networks Trap Monitor Filters Shows menu paths Example Protocols gt IP identifies the IP option on the Protocols menu Separates choices for command keywords and arguments Enter only one of the choices Do not type the vertical line when entering the command Example If the command syntax is show ip alerts routes you enter either show ip alerts or show ip routes but not both American National Standards Institute Advanced Peer to Peer Networking data link connection identifier Data Link Switching downstream physical unit Fiber Distributed Data Interface front end processor Frame Relay 303533 A Rev 00 xiii Configuring LLC Services FRAD IEEE ISO LAN LLC LNM LSAP LSB LSDU MAC MSB NCP NetBIOS OSI PDU RFC SAP SDLC SNA S
48. nfiguration and must use a configuration with real physical MAC addresses for the remote hosts At Router B a mapping table maps Host 1 and 2 to the DLCIs assigned to the hosts The connection request received at Router A will have the source MAC address of the PC MAC and a destination MAC address of Remote Host 1 or 2 Configuration at PC Remote host 1 400000000001 Remote host 2 400000000002 PC MAC 400000000003 DLCI 100 Token Ring CE DLSw Router A Router B p gt Connection request Mapping Table for Router B Remote MAC Local MAC DLCI Source MAC smac PC MAC 400000000001 100 Destination MAC dmac Remote host 1 or 2 400000000002 101 LLC0010A Figure 2 3 Physical MAC to Frame Relay Topology 2 8 303533 A Rev 00 LLC2 Routed over Frame Relay Frame Relay to Physical MAC Figure 2 4 illustrates a sample Frame Relay DLCI to Physical MAC mapping In this network Host 1 and Host 2 can make connection requests to the PC The workstation administrator does not have control over the PC configuration and must use a configuration with real physical MAC addresses for the remote hosts Router B requires a mapping table to map the Host 1 and Host 2 DLCIs to the PC MAC address Router B creates a connection request with the source MAC address equal to the virtual MAC address corresponding to the Host 1 and Host 2 DLCIs Router B also creates a connection request with
49. nia Should you have any questions concerning this Agreement contact Bay Networks Inc 4401 Great America Parkway P O Box 58185 Santa Clara California 95054 8185 LICENSEE ACKNOWLEDGES THAT LICENSEE HAS READ THIS AGREEMENT UNDERSTANDS IT AND AGREES TO BE BOUND BY ITS TERMS AND CONDITIONS LICENSEE FURTHER AGREES THAT THIS AGREEMENT IS THE ENTIRE AND EXCLUSIVE AGREEMENT BETWEEN BAY NETWORKS AND LICENSEE WHICH SUPERSEDES ALL PRIOR ORAL AND WRITTEN AGREEMENTS AND COMMUNICATIONS BETWEEN THE PARTIES PERTAINING TO THE SUBJECT MATTER OF THIS AGREEMENT NO DIFFERENT OR ADDITIONAL TERMS WILL BE ENFORCEABLE AGAINST BAY NETWORKS UNLESS BAY NETWORKS GIVES ITS EXPRESS WRITTEN CONSENT INCLUDING AN EXPRESS WAIVER OF THE TERMS OF THIS AGREEMENT iv 303533 A Rev 00 Contents Preface Before YOU BEGIN ue ecousate ket REO adum Sa Dx oA IN ERR ER INE UR DA ERR RAO NONEM M eda xi uel rae M xii POPU HIE E ze aetate dietis E EES ES Od o ser biet da en GU MATE EAR SORA xiii Bay Networks Technical Publigalfigls 5 exeant petu a edAF Pro atat eee aar Ee pud perpetue RY p EDEC Rc e XV Chapter 1 Logical Link Control Overview Using LLC2 with SNA and NetBIOS iiie pa pr ramec Ee Pnec rta Puede oat E nuestra Fannie eia E 1 2 ete eaae kea ET a deem 1 2 Frame Relay Suppat ca iccccesaacnseocrrcannnimardacanoaadaatnennaca PAAA PP EE AE N T ii Ve Boundary Network Node REC 1490 iioceaucesecasesesec
50. on Licensee will immediately destroy or return to Bay Networks the Software user manuals and all copies Bay Networks is not liable to Licensee for damages in any form solely by reason of the termination of this license 8 Export and Re export Licensee agrees not to export directly or indirectly the Software or related technical data or information without first obtaining any required export licenses or other governmental approvals Without limiting the foregoing Licensee on behalf of itself and its subsidiaries and affiliates agrees that it will not without first obtaining all export licenses and approvals required by the U S Government 1 export re export transfer or divert any such Software or technical data or any direct product thereof to any country to which such exports or re exports are restricted or embargoed under United States export control laws and regulations or to any national or resident of such restricted or embargoed countries or ii provide the Software or related technical data or information to any military end user or for any military end use including the design development or production of any chemical nuclear or biological weapons 9 General If any provision of this Agreement is held to be invalid or unenforceable by a court of competent jurisdiction the remainder of the provisions of this Agreement shall remain in full force and effect This Agreement will be governed by the laws of the state of Califor
51. on requirements e The lower right quarter shows the current interface parameter values Select or highlight the interface you want to customize The values in effect for that interface appear lower right in the parameter value windows Click on Values to display the valid range of values for any parameter Edit those parameters you want to change Use the descriptions following this procedure as a guide Click on Apply to save your changes Click on Done to exit You return to the original window Note Alternatively from the Circuit Definition window select Protocols or Group Protocols gt Edit LLC2 gt Interface to display the Edit LLC2 Interface window This window has the same parameters as the LLC Interface Configuration window The Edit LLC2 Interface window shows only the circuit you have highlighted from the Circuit Definition window Refer to Configuring and Managing Routers with Site Manager for information on editing circuits The LLC2 Interface Configuration window and Edit LLC2 Interface window include the following entries 4 6 303533 A Rev 00 Editing LLC Parameters Parameter Default Options Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Enable Enable Enable Disable Enables or disables the LLC2 interface added previously to this LAN physical circuit Select Enable if you disabled this LLC2 interface
52. ons Bay Networks provides two ways to communicate directly with an SNA processor such as an IBM 3745 or AS 400 over Frame Relay e Boundary Network Node RFC 1490 e Boundary Access Node Boundary Network Node RFC 1490 The Boundary Network Node BNN refers to RFC 1490 Routed SNA over Frame Relay This implementation of LLC2 also complies with the Frame Relay Forum 3 FRE 3 Multiple Protocol Encapsulation over Frame Relay Implementation Agreements which defines how SNA traffic traverses a Frame Relay network BNN allows native SNA traffic originating from SDLC LAN or WAN attached devices to communicate over public or private Frame Relay networks directly with an SNA processor Devices can communicate with intermediate routing nodes or in a single switch configuration function as a Frame Relay Access Device FRAD 303533 A Rev 00 1 3 Configuring LLC Services Since BNN does not carry the destination and source MAC addresses in the network packets the BNN format carries the fewest number of bits per packet and yields low network overhead Therefore you must explicitly define the permanent virtual circuit PVC to carry the packet to its destination You do this with the LLC2 Frame Relay Mapping Table The mapping table consists of three fields e DLCI e Remote or Destination MAC e Local or Source MAC Each entry requires that you specify the Remote MAC Local MAC or both A packet that matches this en
53. orth in subparagraph c 1 of the Commercial Computer Software Restricted Rights clause of FAR 52 227 19 and the limitations set out in this license for civilian agencies and subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause of DFARS 252 227 7013 for agencies of the Department of Defense or their successors whichever is applicable 6 Use of Software in the European Community This provision applies to all Software acquired for use within the European Community If Licensee uses the Software within a country in the European Community the Software Directive enacted by the Council of European Communities Directive dated 14 May 1991 will apply to the examination of the Software to facilitate interoperability Licensee agrees to notify Bay Networks of any such intended examination of the Software and may procure support and assistance from Bay Networks 7 Term and termination This license is effective until terminated however all of the restrictions with respect to Bay Networks copyright in the Software and user manuals will cease being effective at the date of expiration of the Bay Networks copyright those restrictions relating to use and disclosure of Bay Networks confidential information shall continue in effect Licensee may terminate this license at any time The license will automatically terminate if Licensee fails to comply with any of the terms and conditions of the license Upon termination for any reas
54. ow The Configuration Manager automatically selects LLC2 as well 2 Click on OK The Source Route Encapsulation dialog box appears Figure 3 4 Site Manage Use Source Route Encapsulation OK for YES Cancel for NO Figure 3 4 Source Route Encapsulation Dialog Box 3 4 303533 A Rev 00 Enabling LLC Services 3 Select Cancel This selects native routed Frame Relay for LLC2 In the APPN Local Node Name Configuration window specify the APPN Local Node Name parameter and click on OK When the APPN FR Configuration window appears specify the DLCI and SAP parameters and click on OK Refer to Configuring APPN Services for information For DLSw Networks 1 2 Select DLSw from the Select Protocols window Specify the IP Virtual Ring parameter in the DLSw Global Parameters window Click on OK Refer to Configuring DLSw Services for information In the Source Route Encapsulation dialog box Figure 3 4 click on Cancel The LLC2 Frame Relay Mappings window appears Figure 3 5 303533 A Rev 00 3 5 Configuring LLC Services Delete Apply Values Help Ll is Remote MAC Local MAC Figure 3 5 LLC2 Frame Relay Mappings Window 4 Select Add The LLC2 Frame Relay Mapping Add window appears Figure 3 6 3 6 303533 A Rev 00 Enabling LLC Services LLC2 Frame Relay Mapping Add DLCI Remote MAC Local MAC Cancel OK Values Help 101 4
55. pen a connection through the datalink layer e Notifies a higher level protocol that a connection through the datalink layer has been established successfully Enables a higher level protocol to Send or receive LSDUs over an established datalink layer connection Sequence LSDUs sent over a datalink layer connection Control the flow of LSDUs over a datalink layer connection The LLC2 service also e Responds to a request from a higher level protocol to reset a connection to its initially connected state 303533 A Rev 00 1 7 Configuring LLC Services e Responds to a request from a higher level protocol to close an established connection e Notifies a higher level protocol that a connection previously established has been closed successfully Because the connection occurs in the datalink layer rather than in higher layers LLC2 performs frame sequencing flow control and error recovery services for the datalink layer LLC Operation Types LLC supports two operation types e Unnumbered Unacknowledged Type 1 e Numbered Acknowledged Type 2 LLCI supports only Type 1 operations LLC2 supports both Type 1 and Type 2 operations Type 1 Operations Type 1 operations have the following characteristics e LLCs exchange protocol data units PDUs without establishing a datalink connection e The peer does not acknowledge the PDUs it receives e There are no mechanisms for PDU sequencing flow control or erro
56. phabetically e The CD ROMs section lists available CDs e The Guides Books section lists books on technical topics e The Technical Manuals section lists available printed documentation sets Make a note of the part numbers and prices of the items that you want to order Use the Marketing Collateral Catalog description link to place an order and to print the order form How to Get Help For product assistance support contracts or information about educational services go to the following URL http www baynetworks com corporate contacts Or telephone the Bay Networks Technical Solutions Center at 800 2LANWAN 303533 A Rev 00 XV Chapter 1 Logical Link Control Overview LLC is a standard protocol within the CCITT 8802 2 and IEEE 802 x family of LAN standards Connection oriented protocols including IBM Systems Network Architecture SNA and NetBIOS use LLC services Connection oriented protocols do not have a network layer address such as an IP subnet to route information Instead before any information transfer occurs a device on the network sends a broadcast or explorer frame to locate the session partner From this broadcast the network establishes a path for the data transfer LLC2 traffic is generally sensitive to excessive network delays causing problems with SNA and NetBIOS sessions Data Link Switching DLSw and Advanced Peer to Peer Networking APPN resolve these problems by locally
57. r 4 11 Remote MAC 3 8 Send Window 4 9 Virtual Ring Number 4 13 303533 A Rev 00 PDU formats SAP addressing scheme for 1 10 to 1 13 Physical MAC to Frame Relay addressing 2 8 product support xv publications with additional information 1 19 2 13 publications Bay Networks xv R Receive Window parameter 4 8 Reject Timer parameter 4 11 response PDUs disconnected mode DM 1 18 exchange identification XID 1 16 information I 1 16 receiver ready 1 17 test TEST 1 16 unnumbered acknowledged UA 1 18 RFC 1490 2 1 RFC 1490 Frame Relay standard 1 3 router omitting with mainframe and DSPUs 2 1 used as FRAD 2 1 2 4 S SAP addressing scheme global 1 13 group 1 13 individual 1 13 null 1 13 source SAP SSAP field in 1 12 Select LAN Protocols window 3 3 Send Window parameter 4 9 source SAP SSAP field 1 12 support Bay Networks xv supported media Ethernet 1 2 FDDI 1 2 native Frame Relay 1 2 source route bridging 1 2 synchronous 1 2 Token Ring 1 2 303533 A Rev 00 T technical publications xv technical support xv Technician Interface 3 1 text conventions xii type 1 operation parameters maximum octets I PDU 4 8 maximum octets UI PDU 4 7 type 2 operation parameters Ack Timer for Xmt 4 10 Busy Timer 4 11 Inactivity Timer 4 12 Max Links 4 12 Max Octets I PDU 4 8 Receive Window 4 8 Reject Timer 4 11 Send Window 4 9 types of operation number
58. r recovery because higher level protocols perform these services Type 2 Operations Type 2 operations have the following characteristics e The LLC and its peer must establish a datalink layer virtual circuit connection prior to any exchange of data e The source and destination are peer LLCs in an asynchronous balanced datalink connection 303533 A Rev 00 Logical Link Control Overview The source and destination LLCs control traffic by means of a numbering scheme for the sequential transfer of PDUs The PDUS for each virtual circuit connection have independent sequence numbering schemes The destination LLC acknowledges data PDUs that the source LLC sends by informing the source LLC of the next sequence number expected LLC Functionality The LLC sublayer can support multiple logical links concurrently The LLC protocols generate and interpret command packets or frames called protocol data units PDUs which Table 1 1 describes The LLC sublayer Initiates and terminates control signal interchange with the XID TEST SABME and DISC PDUs Organizes data flow with the U I and UA PDUs The level of organization differs between Type 1 and Type 2 operations Interprets command PDUs it receives and generates appropriate response PDUs which differ between Type 1 and Type 2 operations and LLC1 and LLC2 service Manages error control and recovery with the REJ RR RNR and FRMR PDUs Table 1 1 lists Type 1 and Type
59. s been set by an XID information exchange procedure Enter any valid value from 1 to 127 LLC PDUs For sessions that do not negotiate XIDs SNA PU 2 0 and NetBIOS set the router Send Window to the minimum endstation s receive window If the Send Window is too large endstations discard frames they receive outside their receive window Timers recover these frames and dropping these frames degrades performance For sessions that negotiate XIDs SNA PU 2 1 the Send Window sets dynamically during connection establishment The router uses the value specified here as an upper limit and negotiates down Choose a value that is appropriate for the requirements of the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 23 Max Retry After TimeOut 10 retransmissions 1 to 10 Specifies the maximum number of times that a PDU can be sent following expiration of the Ack Timer for Xmt or the Reject timer Enter a valid value from 1 to 10 retransmissions Choose a value that is appropriate for the applications LLC2 supports 1 3 6 1 4 1 18 3 5 1 6 2 1 7 303533 A Rev 00 4 9 Configuring LLC Services Parameter Default Range Function Instructions MIB Object ID Ack Timer for Xmt 1s to 15 Specifies the amount of time in seconds during which the local LLC expects to receive Anacknowledgment for one or more outstanding I PDUs sent during the timer window A response PDU for an unnumbered command
60. supported plus the maximum receive window size 303533 A Rev 00 Logical Link Control Overview The Information field of an FRMR PDU contains the reason for PDU rejection by an LLC The contents of the Information field of an FRMR PDU is beyond the scope of this publication For more details on the FRMR PDU refer to the ISO 8802 IEEE Std 802 2 1989 For More Information about Logical Link Control The following publications give technical details on 802 2 Logical Link Control Token Ring LANs DLSw APPN IBM LAN Network Manager and LNM Servers Institute of Electrical and Electronics Engineers International Standard ISO 6802 2 ANSTI IEEE Std 802 2 1989 Information Processing Systems Local Area Networks Part 2 Logical Link Control Washington D C 1989 IBM Corporation SC30 3374 02 IBM Token Ring Network Architecture Reference 3rd ed September 1989 IBM Corporation 31G6962 IBM LAN Network Manager User s Guide Perlman Radia nterconnections Bridges and Routers Reading Massachusetts Addison Wesley Publishing Company 1992 303533 A Rev 00 Chapter 2 LLC2 Routed over Frame Relay LLC2 connection oriented service in a Bay Networks router supports Frame Relay with both Data Link Switching DLSw and Advanced Peer to Peer Networking APPN based on RFC 1490 Compatibility with RFC 1490 RFC 1490 describes an encapsulation method for carrying internetworking traffic over a Frame Relay backbone
61. t the media on which the Software is provided will be free from defects in materials and workmanship under normal use for a period of 90 days from the date Software is first shipped to Licensee Bay Networks will replace defective media at no charge if it is returned to Bay Networks during the warranty period along with proof of the date of shipment This warranty does not apply if the media has been damaged as a result of accident misuse or abuse The Licensee assumes all responsibility for selection of the Software to achieve Licensee s intended results and for the installation use and results obtained from the Software Bay Networks does not warrant a that the functions contained in the software will meet the Licensee s requirements b that the Software will operate in the hardware or software combinations that the Licensee may select c that the operation of the Software will be uninterrupted or error free or d that all defects in the operation of the Software will be corrected Bay Networks is not obligated to remedy any Software defect that cannot be reproduced with the latest Software release These warranties do not apply to the Software if it has been i altered except by Bay Networks or in accordance with its instructions ii used in conjunction with another vendor s product resulting in the defect or iii damaged by improper environment abuse misuse accident or negligence THE FOREGOING WARRANTIES AND LIMITATIONS ARE EXCLUSIVE REMED
62. tings Tables A 1 and A 2 list the default settings for LLC2 parameters Use the Configuration Manager to edit any of the Site Manager default settings listed here Table A 1 LLC2 Global Parameters Parameter Default Enable Enable Table A 2 LLC2 Interface Parameters Parameter Default Enable Enable Max Octets in UI 5128 octets Max Octets in 5128 Receive Window 7 PDUs Send Window 7 PDUs Max Retry After TimeOut 10 retransmissions Ack Timer for Xmt 1s Reject Timer 1s continued 303533 A Rev 00 Configuring LLC Services Table A 2 LLC2 Interface Parameters continued Parameter Default Busy Timer 60s Inactivity Timer 30s Max Links 255 logical connections Frame Relay Virtual MAC Address 0x400000FF Mask Virtual Ring Number None 303533 A Rev 00 A Ack Timer for Xmt parameter 4 10 acronyms xiii address mapping 2 4 to 2 11 address mask 4 13 addresses real and virtual 2 4 Boundary Access Node BAN 1 4 Boundary Network Node BNN 1 3 Busy Timer parameter 4 11 C classes of service 1 6 to 1 8 connection oriented class 2 1 7 to 1 8 connectionless class 1 1 7 command PDUs disconnect DISC 1 17 exchange identification XID 1 16 frame reject FRMR 1 18 information T 1 16 receiver not ready RNR 1 17 receiver ready RR 1 17 reject REJ 1 17 set asynchronous
63. try is then forwarded to the specified DLCI Bay Networks routers select BNN when you configure the Frame Relay network without source route encapsulation Boundary Access Node The Boundary Access Node BAN is an IBM router enhancement BAN refers to the RFC 1490 specification for Bridged SNA over Frame Relay The associated IBM NCP 7 3 enhancement is called the Boundary Node Identifier BNI Since BAN carries the destination and source MAC addresses in the network packets this format carries more bits per packet Standard BAN uses the Source Route Bridge frame format with local termination Bay Networks routers select BAN when you configure the Frame Relay network with source route encapsulation 1 4 303533 A Rev 00 Logical Link Control Overview Client Host Frame Relay network Single switch DLSw DLSw Bay Networks router TCP IP Bay Networks router Token Ring DLS0007A Figure 1 1 Sample Frame Relay Network 303533 A Rev 00 1 5 Configuring LLC Services LLC 8802 802 2 Standards The LLC protocols comply with the CCITT 8802 2 standard and operate within the IEEE Project 802 x protocol stack Figure 1 2 compares LLC s location in the 802 x protocol stack to its equivalent position in the ISO OSI model ISO OSI Model Application
64. uter with DLSw operating in single switch mode has FRAD like capability supporting Token Ring Ethernet and SDLC endstations The router performs the following actions e Terminates the Data Link Control level sessions e Strips the link level header off the SNA packet e Puts an RFC1490 LLC header on the SNA packet e Sends packets into the Frame Relay network Mapping DLCIs to MAC Addresses The Frame Relay network provides a number of permanent virtual circuits PVCs that form the basis for connections between devices attached to the same Frame Relay network Each virtual circuit is uniquely identified at each Frame Relay interface by a DLCI The Frame Relay interface allows either group or direct single assignment of DLCIs Group assignment allows many DLCIs per circuit direct assignment allows only one The system administrator or Frame Relay provider assigns DLCIs To communicate with an IBM host you must associate the MAC address of your DSPU with a DLCI You can accomplish this task in one of two ways e Create a virtual MAC address formed by preceding the DLCI address such as 100 decimal with a unique mask such as 0x400000FF to make a valid MAC address for example 400000FF0064 Decimal 100 is 64 hexadecimal When the router receives an LLC frame from the DLSw network with a destination MAC dmac starting with the virtual MAC mask it can automatically translate it into a DLCI so no mapping table is needed at the Fr
65. your SRB network 1 3 6 1 4 1 18 3 5 1 6 2 1 25 Editing Frame Relay Mappings To edit and delete Frame Relay mappings that you previously configured start at the Configuration Manager window and 1 Select Protocols gt LLC2 gt Frame Relay Mapping The LLC Frame Relay Mappings window appears Edit the Remote MAC and the Local MAC parameters Refer to Chapter 3 for information on editing the Remote MAC and the Local MAC parameters 303533 A Rev 00 4 13 Configuring LLC Services Deleting an LLC2 Interface To delete an LLC2 interface from its associated physical circuit start at the LLC2 Interface Configuration window Figure 4 3 and 1 Select the LLC2 interface 2 Click on Delete The system software deletes the LLC2 entry you selected and the entry disappears from the list of LLC2 interfaces in the window Editing LLC2 Inbound Traffic Filters For descriptive and procedural information on inbound traffic filters for LLC and any other protocols that support this capability refer to Configuring Traffic Filters and Protocol Prioritization Deleting LLC2 from the Node To delete LLC2 begin at the Configuration Manager window and complete the following steps 1 Select Protocols LLC2 Delete LLC2 A confirmation window appears 2 Select OK The Configuration Manager window appears LLC2 interfaces are no longer configured on the router 4 14 303533 A Rev 00 Appendix A LLC2 Default Set

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