Home

Avaya Configuring LLC Services User's Manual

1. Router A Router B Source MAC smac PC MAC Connection Request No Mapping Destination MAC dmac Remote Host 1 or 2 Figure 2 2 Virtual MAC to Frame Relay Topology 2 6 LLC2 Routed over Frame Relay Frame Relay to Virtual MAC Figure 2 3 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 configured 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 E PC Token Ring DLSw Router A 6A Source MAC smac virtual Destin
2. er B Remote MAC Local MAC DLCI 100 101 2 8 LLC2 Routed over Frame Relay Frame Relay to Physical MAC Figure 2 5 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 DLCISs Router B also creates a connection request with 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 7his mapping does not work with applications that check the source MAC address against configured remote host addresses Configuration at PC Remote Host 1 400000000001 Remote Host 2 400000000002 PC MAC 400000000003 Token Ring DLCI 100 Frame Relay DLCI 101 Router A Router B 4 Connection Request Mapping Table for Router B
3. Remote MAC Local MAC DLCI Source MAC smac virtual Destination MAC dmac 400000000003 400000000003 100 400000000003 101 Figure 2 5 Frame Relay to Physical MAC Topology 2 9 Configuring LLC Services Frame Relay to Frame Relay Figure 2 6 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 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 A creates a connection request with the 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 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 DLCI 102 DLCI 100 Remote Host 2 DLCI 103 100 Decimal 64 hex PC DLCI 101 101 Decimal 65 hex Frame Relay Frame Relay Router A Router B Connection Request Mapping Table for Router A No Mapping Local
4. I PDU 4 8 Index 3 type 2 operation parameters cont Receive Window 4 8 Reject Timer 4 11 Send Window 4 9 types of operation numbered acknowledged type 2 1 5 to 1 16 unnumbered unacknowledged type 1 1 5 to 1 16 V virtual MAC address mask 4 13 Virtual MAC to Frame Relay mapping 2 6 Virtual Ring Number parameter 4 13 W World Wide Web Bay Networks Home Page on XV Index 4
5. 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 Interconnections Bridges and Routers Reading Massachusetts Addison Wesley Publishing Company 1992 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 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 switc
6. 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 e 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 router you configure two interfaces on a single router 2 5 Configuring LLC Services Virtual MAC to Frame Relay Figure 2 2 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 Configuration at PC Remote Host 1 400000FF0064 64 Hex 100 Decimal Remote Host 2 400000FF0065 65 Hex 101 Decimal PC MAC 400000000003 Token Ring DLCI 100 Frame Relay DLCI 101
7. and disclosure are as set forth in the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 Trademarks of Bay Networks Inc ACE AEN BCN BLN BN CN FRE LN Optivity SynOptics SynOptics Communications Wellfleet and the Wellfleet logo are registered trademarks and AN ANH ASN BaySIS BayStack BCNX BLNX BNX EZ Internetwork EZ LAN FN PathMan PhonePlus PPX Quick2Config RouterMan SPEX Bay Networks Bay Networks Press the Bay Networks logo and the SynOptics logo are trademarks of Bay Networks Inc Third Party Trademarks All other trademarks and registered trademarks are the property of their respective owners 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 are Copyright O 1988 Regents of the University of California All 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 related to such distribution and use acknowledge that suc
8. inbound traffic filters editing 4 14 InfoFACTS service xv information field formats 1 16 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 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 non SNA protocols 1 3 and SNA protocols 1 3 automatic configuration of 1 2 classes of service in 1 4 to 1 5 functionality of 1 6 overview of 1 1 to 1 17 protocols requiring 1 1 types of operations in 1 5 to 1 16 MAC addresses real and virtual 2 4 mapping DLCIs to MAC addresses 2 4 to 2 10 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 Index 2 O operation types numbered acknowledged type 2 1 5 to 1 16 unnumbered unacknowledged type 1 1 5 to 1 16 overview of LLC services supported 1 1 to 1 17 P parameters Ack Timer for Xmt 4 10 Busy Timer 4 11 DLCI 3 7
9. 2 LLC2 Routed over Frame Relay SNA Host uw uw XX ua iw IBM Communications Controller with NCP No Router Required Frame Relay Network Token Ring Figure 2 1 Sample Frame Relay Network Using LLC2 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 router 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 PV Cs 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 Y
10. 7 1 or higher Frame Relay Network Bay Networks Router with Single Switch DLSw Operating as FRAD SDLC ib eB Daam To Remote End b Ethernet Sites C Station Figure 2 7 RFC 1490 Bridging and Routing Standards for SNA Configuring LLC Services 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 ed Multiprotocol Encapsulation Implementation Agreement FRE3 Frame Relay Forum 2 12 Chapter 3 Enabling LLC Services This chapter describes how to enable LLC services It assumes that you have read Configuring Routers 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 link or net module 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
11. Parameters 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 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 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 me
12. The P F bit solicits polls a response from the addressed LLC The P F Bit Final F bit indicates the response PDU sent as a result of a soliciting poll command Configuring LLC Services Table 1 4 further defines the purpose of each command and response PDU Table 1 4 Command Names and Definitions Control PE Res Field Definition Value Unnumbered 0x13 Transports information to one or more LLCs Since this Information Ul 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 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 6xxx0 The command PDU indicates to the destin
13. 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 4 1 8 Logical Link Control Overview Command Response Identifier Bit AAA On Figure 1 4 SSAP Address Field 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 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 5 illustrates some SAPs published for NetBIOS and SNA The xx denotes all other published and unpublished SAPs Configuring LLC Services Applications i NetBIOS SNA Path Control LAN Network Manager I I I I I I I I I I I I For LAN Used by attached DLSw I I I I LE I I I I I I devices and Figure 1 5 SAPs for LLC Clients SAP addresses can be Individual Designates a single SAP The individual address is usable as both a
14. apply for interoperability purposes Licensee must notify Bay Networks in writing of any such intended examination of the Software and Bay Networks may provide review and assistance Notwithstanding any foregoing terms to the contrary if licensee licenses the Bay Networks product Site Manager licensee may duplicate and install the Site Manager product as specified in the Documentation This right is granted solely as necessary for use of Site Manager on hardware installed with licensee s network This license will automatically terminate upon improper handling of Software such as by disclosure or Bay Networks may terminate this license by written notice to licensee if licensee fails to comply with any of the material provisions of this license and fails to cure such failure within thirty 30 days after the receipt of written notice from Bay Networks Upon termination of this license licensee shall discontinue all use of the Software and return the Software and Documentation including all copies to Bay Networks Licensee s obligations under this license shall survive expiration or termination of this license Bay Networks Inc 4401 Great America Parkway Santa Clara CA 95054 8 Federal Street Billerica MA 01821 Contents About This Guide PP a TE MN NEED E D DE E xiii Before You Begin Tm T xiii Bay Mebworks Customer SODDONL ccs cia emer e ne Eee Eph cha Mr foror Lanka acea adest do xiv BEE E wasn s
15. cidunt bea eden ane eie QU ba Dua ata 4 2 Eding ELLO T3lobal PAIBIMOIBES 1utocau iic esceiecactkcti OAE auo UE ERE 4 3 Editing EEG lmerace Pare nite secco nte or etit te ot RO e nth lanes 4 4 Editing Frame Relay Mappings caoantccitiedatetitisbe Rer Bibl asa edi bate vado Tui ede be ct oa beds eds 4 13 Deleting am LECZ WAG accented n 4 14 Editing LUCA inbound mae FETS iau ce reiten Fe ud Gest eeepc dde n hdd id 4 14 Deleting LLC2 from the Node ee onus aiken T ideis a ems 4 14 vi Appendix A LLC2 Default Settings Index vii Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 1 6 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 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 Figures The LLC Sublayer in the IEEE 802 x and OSI Models 1 2 LLG PPU STOGI Mem RET TE 1 7 OSAF Address Field iussum eret dtr etri qaod nea Nia bra onera 1 8 GUAPA SS FOR aaa casey reni Edi aiaia 1 9 SAPS Tor HNPEMT Re mE 1 10 I PLU Conttol Field POrTlialE aint rii ter e ota EN rhe Da ere 1 12 Sample Frame Relay Network Using LLC2 eeesessss anes Virtual MAG to Frame Relay ToDOlOGV acies rident toti tocautccineatviassens 2 6 Frame Relay to Virtual MAC Topology sseeeeeeeennns 2 7 Physical MAC to Frame R
16. 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 Timer 4 11 Remote MAC 3 8 Send Window 4 9 Virtual Ring Number 4 13 PDU formats SAP addressing scheme for 1 7 to 1 10 Physical MAC to Frame Relay addressing 2 8 publications with additional information 1 17 2 12 R Receive Window parameter 4 8 Reject Timer parameter 4 11 response PDUs disconnected mode DM 1 16 exchange identification XID 1 14 information D 1 14 receiver ready 1 15 test TEST 1 14 unnumbered acknowledged UA 1 16 RFC 1490 2 1 router omitting with mainframe and DSPUs 2 1 used as FRAD 2 1 2 4 S SAP addressing scheme global 1 10 group 1 10 individual 1 10 null 1 10 source SAP SSAP field in 1 9 Select LAN Protocols window 3 3 Send Window parameter 4 9 source SAP SSAP field 1 9 supported media Ethernet 1 3 FDDI 1 3 native Frame Relay 1 3 source route bridging 1 3 synchronous 1 3 Token Ring 1 3 T Technician Interface 3 1 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
17. protocol to reset a connection to its initially connected state 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 Configuring LLC Services There are no mechanisms for PDU sequencing flow control or error recovery because higher level protocols perform these services Type 2 Operations Type 2 operations have the following characteristics The LLC and its peer must establish a datalink layer virtual circuit connection prior to any exchange of data The source and destination are peer LLCs in an asynchronous balanced datalink connection The source and destination LLCs control traffic by means of a numbering scheme for the sequential transfer of PDUs The PDUs for each virt
18. to Get Help For additional information or advice contact the Bay Networks Technical Response Center in your area United States 1 800 2LAN WAN Valbonne France 33 92 966 968 Sydney Australia 61 2 903 5800 Tokyo Japan 81 3 328 005 XV Configuring LLC Services Conventions This section describes the conventions used in this guide angle brackets gt arrow character gt bold text brackets italic text quotation marks Screen text ellipsis points vertical line l 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 command syntax is ping jp address you enter ping 192 32 10 12 Separates menu and option names in instructions Example Protocols gt AppleTalk identifies the AppleTalk option in the Protocols menu Indicates text that you need to enter and command names in text Example Use the dinfo command Indicate optional elements You can choose none one or all of the options Indicates variable values in command syntax descriptions new terms file and directory names and book titles Indicate the title of a chapter or section within a book Indicates data that appears on the screen Example set Bay Networks Trap Monitor Filters Horizontal and vertical ellipsis points indicate omitted information Indicates that you enter only one of the pa
19. 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 3 1 Configuring LLC Services a parameter is valid Entering an invalid value can corrupt your configuration Caution The Technician Interface does not verify that the value you enter for Enabling LLC2 on an Interface To enable LLC2 on an interface select LLC2 from the Select Protocols window Figure 3 1 Za wrt Protocols 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 Enabling LLC Services Enabling LLC2 Services over Native Frame Relay If y
20. Configuring LLC Services Router Software Version 10 0 Site Manager Software Version 4 0 Part No 112951 Rev A January 1996 ES Bay Networks CES Bay Networks 4401 Great America Parkway 8 Federal Street Santa Clara CA 95054 Billerica MA 01821 Copyright 1988 1996 Bay Networks Inc All rights reserved Printed in the USA January 1996 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 Restricted Rights Legend Use duplication or disclosure by the United States Government is subject to restrictions as set forth in subparagraph c 1 Gi of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 Notice for All Other Executive Agencies 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
21. MAC Source MAC smac virtual 400000FF0064 Destination MAC dmac 400000FF0064 400000FF0065 or 400000FF0065 Figure 2 6 Frame Relay to Frame Relay Topology 2 10 LLC2 Routed over Frame Relay LLC2 over Frame Relay Routed versus Bridged Figure 2 7 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 SNA Mainframe Frame Relay Network Router Encapsulates Data in FR Headers Token Ring f SR over FR RFC 1490 Bridging Standard XX hay v V CO IBM 3745 Communications Controller Running NCP 1 1 1 D T 1 I I 1 Token Ring 1 Router Removes T 1 FR headers 1 1 1 1 I TLEG 1 fi 1 End Station a RFC 1490 Routing Standard a W SNA Mainframe L 1 T I 1 1 1 1 IBM 3745 6 Communications Controller Running NCP
22. R 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 2 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 2 LLC PDU Structure Configuring LLC Services Destination SAP DSAP The DSAP Address field identifies one or more service access points SAPs for which the LLC PDU is intended The 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 3 Address Designation Bit V G Figure 1 3 DSAP Address Field Vs DDDDDD 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
23. 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 Timer 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 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 Inact
24. are 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 Configuration Manager returns to the LLC2 Frame Relay Mappings window showing the added circuit Figure 3 7 3 8 Enabling LLC Services S52 DLCI 101 Bone Add Delete Apply Values Help Se Remote MAC Ox400000F F0064 Local MAC 05 i0000009000K 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 3 9 Chapter 4 Editing LLC Parameters You can edit the parameters for the LLC interfaces that you configure on the router Note 7o 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 Configuri
25. ation LLC or The sequence number for each command PDU xx even The 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 Logical Link Control Overview Table 1 4 Command Names and Definitions continued Control M aa Res Field Definition Value 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 LLC 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 D
26. ation MAC dmac 400000000003 DLCI 100 Frame Relay DLCI 101 Router B Mapping Table for Router B Connection Request a DLCI Remote MAC Local MAC 100 400000000003 101 400000000003 Figure 2 3 Frame Relay to Virtual MAC Topology 2 7 Configuring LLC Services Physical MAC to Frame Relay Figure 2 4 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 configuration 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 Token Ring Frame Relay DLCI 100 DLSw Router A Router B j Connection Request Mapping Table for Rou Source MAC smac PC MAC 400000000001 Destination MAC dmac Remote Host 1 or 2 400000000002 Figure 2 4 Physical MAC to Frame Relay Topology DLCI 101
27. dium 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 7 PDUs 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 Parameter Default Range Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Editing LLC Parameters Send Window 7 PDUs to 127 Specifies a maxi
28. e td e rete n t d xit iode A 1 xi About This Guide Customizing your Bay Networks routers for Logical Link Control LLC services opens your network to LAN Network Manager LNM servers Data Link Switching DLSw services and Advanced Peer to Peer Networking APPN To add these services you need to read about e The LLC protocol and its client protocols see Chapter 1 e LLC2 over Frame Relay see Chapter 2 e Enabling LLC see Chapter 3 Editing LLC parameters see Chapter 4 Audience Written for system and network managers this guide describes how to configure the Bay Networks implementation of LLC to suit your environment Before You Begin Before using this guide you must complete the following procedures e Open a configuration file Specify the router hardware if this is a local mode configuration file e Select the link or net module connector on which you are enabling LLC Refer to Configuring Routers for instructions xiii Configuring LLC Services Bay Networks Customer Support Bay Networks provides live telephone technical support to our distributors resellers and service contracted customers from two U S and three international support centers If you have purchased your Bay Networks product from a distributor or authorized reseller contact the technical support staff of that distributor or reseller for assistance with installation configuration troubleshooting or integration issues Cus
29. elay Topology seeneeeee 2 8 Frame Relay to Physical MAC Topology seen 2 9 Frame Relay to Frame Relay Topology ssssss 2 10 RFC 1490 Bridging and Routing Standards for SNA 2 11 Select Protocols Window LUG only 1 nre ttes 3 2 WAN Protocols Window Frame Relay esee 3 3 Select Proloco WINKOW MR 3 4 Source Route Encapsulation Dialog Box sssssesss 3 4 LLC2 Frame Relay Mappings Window TE 3 6 LLC2 Frame Relay Mapping Add Window eeeneee 3 7 LLC2 Frame Relay Mappings Window with DLCI Added 39 Configuration Manager WINDOW 22e iei teise rsen tete pat aisi ia 4 2 Edi ELO Global Parameters Window 5e ro HD tt be kedetia bocas 4 3 LLC2 Interface Configuration Window 4 5 LLC2 Interface Configuration Window Bottom sssssss 4 5 Tables Table 1 1 LLG Command PDLS crossed rp aa E CEP baies ed ut ARRA 1 7 Table 1 2 PDU Format and Functional Purpose t 1 13 Table 1 3 Control Field Bits and Functional Purpose ssseesesess 1 13 Table 1 4 Command Names and Definitions seeeessssssseeeeseeeeeenn 1 14 Table A 1 DEC CDL P SDUTISIS IS oai Lia te eed to me tenon en ere car tot ce amd A 1 Table A 2 LEGE Inmertsce Parameters tic
30. elect a hexadecimal number from Ox1 to Oxfff that is unique in 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 LLC22 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 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 Protocols2LLC22Delete LLC2 A confirmation window appears 2 Select OK The Configuration Manager window appears LLC2 interfaces are no longer configured on the router 4 14 Appendix A LLC2 Defa
31. equest for Comment SAP service access point SDLC Synchronous Data Link Control SNA Systems Network Architecture SR source routing SRB source route bridging WAN wide area network xviii Chapter 1 Logical Link Control Overview LLC is a standard protocol within the CCITT 8802 2 and IEEE 802 x family of LAN standards Other protocols such as IBM Systems Network Architecture SNA Novell NetWare and DECnet use LLC services for end to end communication in a LAN environment 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 A Bay Networks router configured for LLC supports e Data Link Switching DLSw as defined in RFC 1434 and Configuring DLSw Services e Advanced Peer to Peer Networking APPN as defined in Configuring APPN Services LAN Network Manager LNM as defined in Configuring LNM 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 1 compares LLC s location in the 802 x protocol stack to its equivalent position in the ISO OSI model Configuring LLC Services Application Presentation Session IEEE 802 Model Transport 802 1 Network 8022 LLC Data Link MAC Physical Physical Figure 1 1 The LLC Sublayer in the IEEE 802 x and OSI Models You can add an IEEE 802 2 com
32. h 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 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 configure 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
33. h portions of the software were developed by the University of California Berkeley The name of the University may not be used to endorse or promote products derived from such portions of the software without specific prior written permission SUCH PORTIONS OF THE SOFTWARE ARE PROVIDED AS IS AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE In addition the program and information contained herein are licensed only pursuant to a license agreement that contains restrictions on use and disclosure that may incorporate by reference certain limitations and notices imposed by third parties Bay Networks Software License Note This is Bay Networks basic license document In the absence of a software license agreement specifying varying terms this license or the license included with the particular product shall govern licensee s use of Bay Networks software This Software License shall govern the licensing of all software provided to licensee by Bay Networks Software Bay Networks will provide licensee with Software in machine readable form and related documentation Documentation The Software provided under this license is proprietary to Bay Networks and to third parties from whom Bay Networks has acquired license rights Bay Networks will not grant any Software license whatsoever either explicitly or implic
34. in 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 Edi LLEF Global Farasatarz Conce Figure 4 2 Edit LLC2 Global Parameters Window 2 Change the Enable parameter to Disable if 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 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
35. isconnect 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 Configuring LLC Services Table 1 4 Command Names and Definitions continued Control MS Res Field Definition P Value Unnumbered 73 The 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 reini
36. itly except by acceptance of an order for either Software or for a Bay Networks product Equipment that is packaged with Software Each such license is subject to the following restrictions 1 Upon delivery of the Software Bay Networks grants to licensee a personal nontransferable nonexclusive license to use the Software with the Equipment with which or for which it was originally acquired including use at any of licensee s facilities to which the Equipment may be transferred for the useful life of the Equipment unless earlier terminated by default or cancellation Use of the Software shall be limited to such Equipment and to such facility Software which is licensed for use on hardware not offered by Bay Networks is not subject to restricted use on any Equipment however unless otherwise specified on the Documentation each licensed copy of such Software may only be installed on one hardware item at any time Licensee may use the Software with backup Equipment only if the Equipment with which or for which it was acquired is inoperative Licensee may make a single copy of the Software but not firmware for safekeeping archives or backup purposes Licensee may modify Software but not firmware or combine it with other software subject to the provision that those portions of the resulting software which incorporate Software are subject to the restrictions of this license Licensee shall not make the resulting software available f
37. ivity Timer Ack Timer for Xmt Max Retry After TimeOut Defaults 30 1 10 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 4 12 Parameter Default Options Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Editing LLC Parameters 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 0x1 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 S
38. knowledgment for one or more outstanding I PDUS sent during the timer window A response PDU for an unnumbered command 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 Parameter Default Range Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Editing LLC Parameters Reject Timer 1s 1 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
39. mum 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 has 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 4 9 Configuring LLC Services Parameter Default Range Function Instructions MIB Object ID Ack Timer for Xmt Is to 15 Specifies the amount of time in seconds during which the local LLC expects to receive An ac
40. n SSAP and a DSAP The individual SAP has an Address Designation bit value of 0 Group Designates a group of DSAPs The group DSAP has an Address Designation bit value of 1 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 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 Logical Link Control Overview 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 PDU defines the type of operation Type 1 versus Type 2 Information an I format PDU e Supervisory an S format PDU e Unnumbered a U format PDU Figure 1 6 shows the three Control field formats Configuring LLC Services format PDU Information Transfer Commands Responses S format PDU Supervisory Commands Responses U format PDU Unnumbered Commands Responses N S Send Sequence Number N R Receive Sequence Number S Supervisory function bit M Modifier function bit X Reserved and set to zero P F Poll Final bit Figure 1 6 LLC PDU Control Field Format Control Field Formats Table 1 2 furthe
41. ndow 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 configuration requirements e The lower right quarter shows the current interface parameter values 2 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 3 Edit those parameters you want to change Use the descriptions following this procedure as a guide 4 Click on Apply to save your changes 5 Click on Done to exit You return to the original window Note Alternatively from the Circuit Definition window select Protocols or Group Protocols Edit LLC2 2Interface 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 Routers for information on editing circuits The LLC2 Interface Configuration window and Edit LLC2 Interface window include the following entries 4 6 Parameter Default Options Function Instructions MIB Object ID Parameter Default Range Function Instructions MIB Object ID Editing LLC
42. ng Routers 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 4 1 Configuring LLC Services Configuring LLC Parameters To access and edit LLC parameters begin at the Configuration Manager window Figure 4 1 and select the Protocols 23LLC2 menu path HIH Wersbnni pem Slot System Renource Houle 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 Routers 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 DLSw and the LNM Servers 4 2 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 beg
43. nly 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 layer sequencing and error control in bridged LAN environments LLC2 works much like SDLC in terms of packet sequencing and acknowledgment but 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 LLC and Non SNA Protocols Though TCP IP NetWare DECnet and other internetworking protocols do not require an LLC connection oriented datalink layer their network and transport layers provide the required functions these protocols can in fact use LLC1 services if you so elect You add LLC1 interfaces to a router configuration to support these higher level protocols Supported Media DLSw and APPN with LLC2 run over the following e Token Ring Ethernet e Synchronous media e FDDI Configuring LLC Services LLC2 runs over source route bridging SRB on all media LLC2 also runs over the transparent bridge on Ethernet Every interface to Ethernet however must have LLC2 and either the DLSw or APPN protocol enabled LLC supports routed native Frame Relay It conforms to RFC 1490 LNM with LLC run
44. or use by any third party Neither title nor ownership to Software passes to licensee Licensee shall not provide or otherwise make available any Software in whole or in part in any form to any third party Third parties do not include consultants subcontractors or agents of licensee who have licensee s permission to use the Software at licensee s facility and who have agreed in writing to use the Software only in accordance with the restrictions of this license Third party owners from whom Bay Networks has acquired license rights to software that is incorporated into Bay Networks products shall have the right to enforce the provisions of this license against licensee Licensee shall not remove or obscure any copyright patent trademark trade secret or similar intellectual property or restricted rights notice within or affixed to any Software and shall reproduce and affix such notice on any backup copy of Software or copies of software resulting from modification or combination performed by licensee as permitted by this license Bay Networks Inc 4401 Great America Parkway Santa Clara CA 95054 8 Federal Street Billerica MA 01821 Bay Networks Software License continued 10 11 12 Licensee shall not reverse assemble reverse compile or in any way reverse engineer the Software Note For licensees in the European Community the Software Directive dated 14 May 1991 as may be amended from time to time shall
45. ot ready RNR 1 15 receiver ready RR 1 15 reject REJ 1 15 set asynchronous balanced mode extended SABMEB 1 15 test TEST 1 14 unnumbered information UI 1 14 Index CompuServe Bay Networks forum on xiv Configuration Manager window 4 2 configuring parameters in PDU control field 1 11 to 1 13 control field formats information T 1 11 to 1 13 supervisory S 1 11 to 1 13 unnumbered U 1 11 to 1 13 control field parameters poll final bit 1 12 1 13 receive sequence number bit 1 12 1 13 send sequence number bit 1 12 1 13 customer support See getting help 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 10 documentation additional 1 17 2 12 E Enable global parameter 4 3 to 4 4 Enable interface parameter 4 7 enabling LLC services 3 1 enabling LLC2 services 3 2 Index 1 F FRAD frame relay access device use of in LLC2 2 1 2 4 Frame Relay Mappings window 3 6 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 G getting help from a Bay Networks Technical Response Center xv through CompuServe xiv through InfoFACTS service xv through World Wide Web xv IBM NCP compatibility 2 1 Inactivity Timer parameter 4 12
46. ou 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 e z l e Frame Relay x N ul gt ATM DXI gt SDLC LAPB only Figure 3 2 WAN Protocols Window Frame Relay The Select Protocols window appears Figure 3 3 3 3 Configuring LLC Services Figure 3 3 Select Protocols Window For APPN Networks 1 Select APPN from the Select Protocols window The Configuration Manager automatically selects LLC2 as well 2 Click on OK The Source Route Encapsulation dialog box appears Figure 3 4 Site Manager Use Source Route Encapsulation OK for YES Cancel for NO Figure 3 4 Source Route Encapsulation Dialog Box 3 4 Enabling LLC Services 3 Select Cancel This selects native routed Frame Relay for LLC2 4 In the APPN Local Node Name Configuration window specify the APPN Local Node Name parameter and click on OK 5 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 Select DLSw from the Select Protocols window 2 Specify the IP Virtual Ring parameter in the DLSw Global Parameter
47. ou 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 Frame 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 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
48. p ead e 1 16 For More Information about Logical Link Control siisii 1 17 Chapter 2 LLC2 Routed over Frame Relay Gompatbility wir RRC PAS arenorna a prd i a iru d tg rk nd FEES RR LER Re E ERR 2 1 Compatibility with IBM NCP 7 1 and Plgligr 122 cess tiene iue esacc eden abbat bnc irt aduer tec 2 1 FAD IG FUN Ore t Es 2 4 Mapping BECIs to MAG Addresses 2nd ce tiit na tac Eo Ec na ceded 2 4 Router Mapping Examples T TET U T TT ET ae Mittal MAG To Frame REAY ica sania cers sedentartionsasiieaciiacteedasveiapessiqiaeenpsnidieuetdeaivenras 2 6 Frame Relay To VIDE MAG iesarkana b da Cien adu end M bn rette 2 7 Pisca MAD to Frame Relay ues oie odas be uiu bE Eo e t ibdbesne a UB De daas toD ied 2 8 Frame Relay to Physieal MAG iussi te o as o cr Ed er QE OE dn 2 9 Fame Relay to Frame Relay ERE EDS 2 10 LLC2 over Frame Relay Routed versus Bridged essssssssssss 2 11 For More Information about LLC2 over Frame Relay sse 2 12 Chapter 3 Enabling LLC Services sing the Parameter Descrip te aciisccie sweat Gaceta ide ndi aeri der ud eR 3 1 Enabling ELEC eh an triacs canis ois so RR cea dtl ead tede dut edu Kx aun ad AAN 3 2 Enabling LLC2 Services over Native Frame Relay siruri ccena 3 3 Eu PIT NIG IES sortie rini ti pet dot Eee ra dudaa retira e lobes otia 3 4 Far psu NoN KS oussdetendicsue pim tol iditebeudEbL e d e emia 3 5 Chapter 4 Editing LLC Parameters Congue LLO Pa ET DOR os Lodo i GE eec
49. pliant 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 Certain protocols on a Bay Networks router automatically configure a supporting LLC1 default interface and if needed a configurable LLC2 interface on the same circuit For example Bay Networks routers in your corporate network may need to support sessions between an LNM workstation client and multiple Token Ring LANs in that network In this case Site Manager enables you to add an LNM Servers subsystem to any Token Ring circuit on the router The LNM Servers on a Token Ring circuit automatically configure an LLC1 and an LLC2 interface on the same physical circuit 1 2 Logical Link Control Overview Both APPN and DLSw support a default LLC configuration You can customize the operation of any LLC2 interface that the router automatically adds to the configuration using the Configuration Manager software LLC and SNA 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 commo
50. r defines the purpose of the three PDU types where the specific format in the PDU Control field determines the type Logical Link Control Overview Table 1 2 PDU Format and Functional Purpose Format Function Information The format PDU performs a numbered information transfer in Type Transfer 2 operation Except for the Ul TEST FRMR and XID Format I command 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 transmission 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 Functional Purpose Bit Purpose Send Only PDUs contain N S which is the sequence number of the PDU Sequence being transmitted Number N S Bit Receive PDUs contain N R which is the sequence number of the PDU an Sequence LLC expects to receive next on the specified datalink connection Number N R Bit Poll Final
51. rts of the command The vertical line separates choices Do not type the vertical line when entering the command Example If the command syntax is show at routes nets you enter either show at routes or show at nets but not both xvi About This Guide Ordering Bay Networks Publications To purchase additional copies of this document or other Bay Networks publications order by part number from Bay Networks Press at the following numbers You may also request a free catalog of Bay Networks Press product publications Phone FAX U S Canada FAX International Acronyms ANSI APPN DLCI DLSw DSPU FDDI FEP FR FRAD IEEE ISO LAN LLC LNM LSAP LSB LSDU MAC MSB NCP NetBIOS OSI 1 800 845 9523 1 800 582 8000 1 916 939 1010 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 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 xvii Configuring LLC Services PDU protocol data unit RFC R
52. s window Click on OK Refer to Configuring DLSw Services for information 3 In the Source Route Encapsulation dialog box Figure 3 4 click on Cancel The LLC2 Frame Relay Mappings window appears Figure 3 5 3 5 Configuring LLC Services Done Add Delete Apply Values Help ml Remote MAC Local MAC ii Figure 3 5 LLC2 Frame Relay Mappings Window 4 Select Add The LLC2 Frame Relay Mapping Add window appears Figure 3 6 3 6 Enabling LLC Services DLCI Remote MAC Local MAC Cancel OK Values Help 101 400000FF0064 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 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 hardw
53. s Sins ean E sas edad ce acne o edie cab AX dde E Foo AUR oria xiv nur zileqp cde E XV WSO OE E TIE NT XV How to Get Help reis Tm EEE uted team cera adi EA lautet pts XV popoli M R xvi Ordering Bay Networks PUDICARIOITS iiia secu tesa dou sat cue add nin be d1 dui RR AAA xvii PEOS qaod die iam ice t ease ERE oL Or o DU ote bode Leu pide De diabete tu obe ocu prdb Lab isdule xvii Chapter 1 Logical Link Control Overview LLC 8802 802 2 Standards uut dena edad erum E E cade UN 1 1 LG RNG ONA C Y 1 3 LEG ant NoT SNA Ds een sci estaban Sosa ode da Amori n Anse Fire dab aside de 1 3 Suppornmsd BOO cistapidistedqissi tou pad ate eme te bU aie bez pado e Pisoni aai 1 3 PIG Senet Classes ERE MI 1 4 LLG 1 Conmecionless SOIVIGG 2 tances annaaninnainie nner 1 4 ELG2 Oonneetion Oriented SEVICE uiciiescieie itienteranrtdecrcacesnentaicsitenssstaraiecasanatieares 1 4 LG Operation eS A MESE TEE ES 1 5 Use c eem I TT 1 5 crei o atte M 1 6 EECOEBDONO DS ceca a dise Meeeerm mene MN nie anim rene A nvr ner i pL ML c D 1 6 LLG Protocol Data Uni POMES rousen tk pue uarie ced BAKE CI ORE EIUS TEN 1 7 asta SP OD SAP I asrandi nan HER rt ES Toda t ca eed a tcl a sid 1 8 Boum NP S iss bea ier nal aea Hitless uda adderet LE AE A E T EN 1 8 DAP Addressing CMGI e E 1 9 COE PD us ceo dct POOE EE ted td Erde hd AAEE EYE Rd EE TR p ERR ER PEE da 1 11 OVA K FOMA T 1 12 se
54. s over Token Ring only LLC Service Classes The 802 2 LLC recommendations support three service classes e Connectionless Unacknowledged Class 1 or LLC1 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 LLCI 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 open a connection through the datalink layer 1 4 Logical Link Control Overview 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
55. 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 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 Interfaces The LLC2 Interface Configuration window appears Figure 4 3 4 4 Editing LLC Parameters E TES Del 551 llc 582 1c Apply m THRIPS eae Help Hx Octet in UT Has Octet in I Receive bdirnirne Send Wingu How Retry After TimeOut 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 Freee Reloy Virtue AAC Addresa Hari Virtus Ring Himbeer Chex Figure 4 4 LLC2 Interface Configuration Window Bottom 4 5 Configuring LLC Services The LLC2 Interface Configuration window contains the following information fields e The upper left quarter contains a wi
56. t documentation and software To open an account and receive a local dial up number call CompuServe at 1 800 524 3388 and ask for Representative No 591 e Inthe United Kingdom call Freephone 0800 289378 Xiv About This Guide e In Germany call 0130 37 32 e In Europe except for the United Kingdom and Germany call 44 272 760681 e Outside the U S Canada and Europe call 614 529 1349 and ask for Representative No 591 or consult your listings for an office near you Once you are online you can reach our forum by typing the command GO BAYNETWORKS at any prompt InfoFACTS InfoFACTS is the Bay Networks free 24 hour fax on demand service This automated system contains libraries of technical and product documents designed to help you manage and troubleshoot your Bay Networks products The system can return a fax copy to the caller or to a third party within minutes of being accessed World Wide Web The World Wide Web WWW is a global information system for file distribution and online document viewing via the Internet You need a direct connection to the Internet and a Web Browser such as Mosaic or Netscape Bay Networks maintains a WWW Home Page that you can access at http www baynetworks com One of the menu items on the Home Page is the Customer Support Web Server which offers technical documents software agents and an E mail capability for communicating with our technical support engineers How
57. tializing 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 The Information field of an I format PDU contains only user data The Information field of a UI command response PDU also contains only user data The Information field of a TEST command response PDU is optional and contains a test pattern used for LLC loopback testing 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 supported plus the maximum receive window size 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
58. tomers also have the option of purchasing direct support from Bay Networks through a variety of service programs The programs include priority access telephone support on site engineering assistance software subscription hardware replacement and other programs designed to protect your investment To purchase any of these support programs including PhonePlus for 24 hour telephone technical support call 1 800 2LANWAN Outside the U S and Canada call 408 764 1000 You can also receive information on support programs from your local Bay Networks field sales office or purchase Bay Networks support directly from your reseller Bay Networks provides several methods of receiving support and information on a nonpriority basis through the following automated systems CompuServe Bay Networks maintains an active forum on CompuServe All you need to join us online is a computer a modem and a CompuServe account We also recommend using the CompuServe Information Manager software available from CompuServe The Bay Networks forum contains libraries of technical and product documents designed to help you manage and troubleshoot your Bay Networks products Software agents and patches are available and the message boards are monitored by technical staff and can be a source for problem solving and shared experiences Customers and resellers holding Bay Networks service contracts can visit the special libraries to acquire advanced levels of suppor
59. ual 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 2 command PDUs and their counterpart response PDUs Type 1 operations do not include definition of an Acknowledgment PDU 1 6 Logical Link Control Overview e Type 2 operations do not include a command PDU counterpart for the FRMR Response No response Exchange Identification XID Test TEST response PDU Table 1 1 LLC Command PDUs Operation Command Type Type 1 Unnumbered Information UI Exchange Identification XID Test TEST Type 2 Information l Information I Receiver Ready R
60. ult Settings 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 A 1 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 A 2 A Ack Timer for Xmt parameter 4 10 address mapping 2 4 to 2 10 address mask 4 13 addresses real and virtual 2 4 Bay Networks CompuServe forum xiv customer support xiv Home Page on World Wide Web xv InfoFACTS service xv publications ordering xvii Technical Response Center xv Busy Timer parameter 4 11 C classes of service 1 4 to 1 5 connection oriented class 2 1 4 to 1 5 connectionless class 1 1 4 command PDUs disconnect DISC 1 15 exchange identification XID 1 14 frame reject FRMR 1 16 information D 1 14 receiver n

Avaya Configuring LLC Services User's Manual

Contents

Download Pdf Manuals

Related Search

Related Contents