Troubleshooting Async Multilink PPP Operations
Contents
1. http www cisco com warp public 793 acce ss_dial async_multilink html Troubleshooting Async Multilink PPP Operations m Chapter2 Diagnosing and Troubleshooting Async Multilink PPP M Async MPPP Troubleshooting Tables Table 2 2 Calls fail to connect Problem Suggested Diagnostic Steps Call not answered Refer to the following related site http www cisco com warp public 112 chap ter17 htm NAS Additional calls receive a busy signal 1 From the NAS use the show modem summary Cisco IOS command to verify that modems are available See the output provided in Cisco IOS show modem summary Command Output for additional information 2 Verify that there are enough modems available PC Authentication failure 1 Use the debug ppp authentication Cisco IOS command to determine if authentication failures are occurring See the output provided in Cisco IOS debug ppp authentication Command Output for additional information 2 If authentication failures are found ensure that passwords and usernames are entered correctly Router Modem failure 1 Reverse telnet to each modem separately Refer to the following document for notes about reverse telnet http www cisco com univercd cc td d oc product software ios120 12cgcr d ial_c dertelnt htm 2 Enter the AT command 3 Look for ok response 4 If ok is not returned troubleshoot hardware for other problems 5 For routers wit2. amp Note Please refer to the following document for related information http www cisco com warp public 131 mppp_bundle name html 1 Use the show ppp multilink Cisco IOS command at the NAS and router to determine if bundling is occurring See the output provided in Cisco IOS show ppp multilink Command Output for additional information Look for the bundle or user name If bundling is occurring a bundle with the associated user will appear If bundling is not occurring use the debug ppp negotiation and debug ppp multilink events Cisco IOS commands to verify MRRU requests are occurring on both ends and whether a bundle is being created See the output provided in Cisco IOS debug ppp negotiation Command Output for additional information If MRRU requests are not occurring on either end ensure that ppp multilink interface configuration command is configured on all required interfaces Disconnect existing links and reconnect If MRRU requests are being exchanged but bundling is not occurring the refer to the following documents for Cisco IOS configuration information http www cisco com warp public 793 access dial router2router html http www cisco com warp public 793 access dial async_multilink html NAS Fast switching is not working Use show running config Cisco IOS command to verify that all the applicable interfaces do not have the following command no
3. problems can be separated as being associated with remote clients remote routers or central site NASs Because of similarities between symptoms and problems for these different situations the following troubleshooting tables address these diagnostic topics collectively As appropriate differences between client router and NAS problems are called out separately The diagnostics summaries address the troubleshooting process using three basic stages 1 Identifying symptoms 2 Isolating problems 3 Resolving problems Each diagnostic table includes suggestions for identifying and isolating problems Specific diagnostic output is included to illustrate how network entities react to failures and how to discern specific failures Note Some of the symptoms described in the following tables can be caused by a variety of problems other than async MPPP issues Because this case study focuses on async MPPP based topics the problems and diagnostics provided here focus on async MPPP issues Troubleshooting Async Multilink PPP Operations CHAPTER 2 Diagnosing and Troubleshooting Async Multilink PPP This chapter focuses on diagnosing and troubleshooting typical async multilink PPP problems This section reviews the case study environment 21 Async MPPPTroubleshooting Tables The following symptoms are addressed in separate tables in this section Multilink fails Calls fail to connect Poor performance IP connectivity is
4. 0x0206000A0000 Sep 1 13 52 42 287 UTC As2 LCP MagicNumber 0x0042C48F 0x05060042C48F Sep 1 13 52 42 287 UTC As2 LCP PFC 0x0702 Sep 1 13 52 42 287 UTC As2 LCP ACFC 0x0802 Sep 1 13 52 42 287 UTC As2 LCP Callback 6 0x0D0306 Sep 1 13 52 42 287 UTC As2 LCP MRRU 1500 0x110405DC Sep 1 13 52 42 287 UTC As2 LCP EndpointDisc 1 Local Sep 1 13 52 42 287 UTC As2 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 52 42 287 UTC As2 LCP 0x370000 Sep 1 13 52 42 287 UTC As2 LCP O CONFREQ Listen id 12 len 47 Sep 1 13 52 42 291 UTC As2 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 52 42 291 UTC As2 LCP AuthProto CHAP 0x0305C22305 Sep 1 13 52 42 291 UTC As2 LCP MagicNumber 0xA53BCC27 0x0506A53BCC27 Sep 1 13 52 42 291 UTC As2 LCP PFC 0x0702 Sep 1 13 52 42 291 UTC As2 LCP ACFC 0x0802 Sep 1 13 52 42 291 UTC As2 LCP MRRU 1524 0x110405F4 Sep 1 13 52 42 291 UTC As2 LCP EndpointDisc 1 Local Sep 1 13 52 42 291 UTC As2 LCP 0x131201626F62736C616B652D6E61732D Sep 1 13 52 42 291 UTC As2 LCP 0x3031 Sep 1 13 52 42 291 UTC As2 LCP O CONFREJ Listen id 3 len 7 Sep 1 13 52 42 291 UTC As2 LCP Callback 6 0x0D0306 Sep 1 13 52 44 287 UTC As2 LCP TIMEout State REQsent Sep 1 13 52 44 287 UTC As2 LCP O CONFREQ REQsent id 13 len 47 Sep 1 13 52 44 287 UTC As2 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 52 44 287 UTC As2 LCP AuthProto CHAP 0x0305C22305 Sep 1 13 52 44 287 UTC As2 LCP MagicNumber 0xA53BCC27 0x050
5. Local Sep 1 13 53 47 804 UTC As5 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 53 47 804 UTC As5 LCP 0x370000 Sep 1 13 53 47 804 UTC As5 LCP O CONFREJ ACKrcvd id 4 len 7 Sep 1 13 53 47 804 UTC As5 LCP Callback 6 0x0D0306 Sep 1 13 53 48 008 UTC As5 LCP I CONFREQ ACKrcvd id 5 len 43 Sep 1 13 53 48 008 UTC As5 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 53 48 008 UTC As5 LCP MagicNumber 0x0043B7F1 0x05060043B7F1 Sep 1 13 53 48 008 UTC As5 LCP PFC 0x0702 Sep 1 13 53 48 008 UTC As5 LCP ACFC 0x0802 Sep 1 13 53 48 008 UTC As5 LCP MRRU 1500 0x110405DC Sep 1 13 53 48 012 UTC As5 LCP EndpointDisc 1 Local Sep 1 13 53 48 012 UTC As5 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 53 48 012 UTC As5 LCP 0x370000 Sep 1 13 53 48 012 UTC As5 LCP O CONFACK ACKrcvd id 5 len 43 Sep 1 13 53 48 012 UTC As5 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 53 48 012 UTC As5 LCP MagicNumber 0x0043B7F1 0x05060043B7F1 Sep 1 13 53 48 012 UTC As5 LCP PFC 0x0702 Sep 1 13 53 48 012 UTC As5 LCP ACFC 0x0802 Sep 1 13 53 48 012 UTC As5 LCP MRRU 1500 0x110405DC Sep 1 13 53 48 012 UTC As5 LCP EndpointDisc 1 Local Sep 1 13 53 48 012 UTC As5 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 53 48 012 UTC As5 LCP 0x370000 Sep 1 13 53 48 012 UTC As5 LCP State is Open Sep 1 13 53 48 012 UTC As5 PPP Phase is AUTHENTICATING by this end Sep 1 13 53 48 012 UTC As5 CHAP O CHALLENGE id 6 len 36
6. Sep 1 13 52 45 843 UTC Vil LCP 0x04 Sep 1 13 52 45 939 UTC Vil IPCP I CONFACK REQsent id 1 len 10 Sep 1 13 52 45 939 UTC Vil IPCP Address 172 21 104 254 0x0306AC1568FE Sep 1 13 52 47 771 UTC Vil IPCP TIMEout State ACKrcvd Sep 1 13 52 47 771 UTC Vil IPCP O CONFREQ ACKrcvd id 2 len 10 Sep 1 13 52 47 771 UTC Vil IPCP Address 172 21 104 254 0x0306AC1568FE Sep 1 13 52 47 923 UTC Vil IPCP I CONFACK REQsent id 2 len 10 Sep 1 13 52 47 923 UTC Vil IPCP Address 172 21 104 254 0x0306AC1568FE Sep 1 13 52 48 835 UTC Vil IPCP I CONFREQ ACKrcvd id 2 len 34 Sep 1 13 52 48 835 UTC Vil IPCP Address 0 0 0 0 0x030600000000 Sep 1 13 52 48 835 UTC Vil IPCP PrimaryDNS 0 0 0 0 0x810600000000 Sep 1 13 52 48 835 UTC Vil IPCP PrimaryWINS 0 0 0 0 0x820600000000 Sep 1 13 52 48 835 UTC Vil IPCP SecondaryDNS 0 0 0 0 0x830600000000 Sep 1 13 52 48 835 UTC Vil IPCP SecondaryWINS 0 0 0 0 0x840600000000 Sep 1 13 52 48 835 UTC Vil IPCP O CONFREJ ACKrcvd id 2 len 16 Sep 1 13 52 48 835 UTC Vil IPCP PrimaryWINS 0 0 0 0 0x820600000000 Sep 1 13 52 48 835 UTC Vil IPCP SecondaryWINS 0 0 0 0 0x840600000000 Sep 1 13 52 49 011 UTC Vil IPCP I CONFREQ ACKrcvd id 3 len 22 Sep 1 13 52 49 011 UTC Vil IPCP Address 0 0 0 0 0x030600000000 Sep 1 13 52 49 011 UTC Vil IPCP PrimaryDNS 0 0 0 0 0x810600000000 Sep 1 13 52 49 011 UTC Vil IPCP SecondaryDNS 0 0 0 0 0x830600000000 Sep 1 13 52 49 011 UTC Vil IPCP O CONFNAK A
7. from NAS Sep 1 13 53 48 264 UTC As5 CHAP I RESPONSE id 6 len 37 from clearlake lan 01 Sep 1 13 53 48 268 UTC As5 CHAP O SUCCESS id 6 len 4 Troubleshooting Async Multilink PPP Operations Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output Cisco IOS show processes cpu Command Output W Sep 1 13 53 48 268 UTC As5 MLP Multilink up event pending Sep 1 13 53 48 268 UTC As5 PPP Phase is VIRTUALIZED Sep 1 13 53 48 268 UTC As5 MLP clearlake lan 01 b07502c88ec4420014be1fc155370000 multilink up Sep 1 13 53 48 268 UTC As5 IPCP Remove route to 172 21 104 24 NAS NAS Refer to Table 2 3 Table 2 4 and Table 2 8 for related symptom problem and diagnostic notes 3 1 Cisco IOS show processes cpu Command Output In the following example command output the CPU utilization is very low NAS show processes cpu CPU utilization for five seconds 0 0 one minute 0 five minutes 0 PID Runtime ms Invoked uSecs 5Sec 1Min 5Min TTY Process 1 110876 1344651 82 0 00 0 00 0 00 0 Load Meter 2 356 3895 91 0 24 0 02 0 00 50 Virtual Exec 3 6619420 904515 7318 0 00 0 06 0 06 0 Check heaps Refer to Table 2 3 and Table 2 5 for related symptom problem and diagnostic notes 3 8 Cisco 10S show ip route Command Output The following show ip route client IP address Cisco IOS command output illustrates the use of this command to determine whether a route to a specific IP address exists In this case the route
8. ip route cache If this command is included enable the ip route cache interface configuration command on all applicable interfaces E Troubleshooting Async Multilink PPP Operations Chapter 2 Diagnosing and Troubleshooting Async Multilink PPP Table 2 3 Poor performance Problem Async MPPP Troubleshooting Tables Wi Suggested Diagnostic Steps NAS Processor overhead 1 Use the show processes cpu Cisco IOS command at the NAS to determine CPU utilization See the output provided in Cisco IOS show processes cpu Command Output for additional information 2 If top line utilization number is approaching 100 percent investigate CPU load issue Refer to the following URL http www cisco com warp public 63 hig hepu html PC Dialup Networking DUN 1 3 or higher needed PC DUN 1 3 was issued by Microsoft as a performance improvement over PC DUN 1 2 Refer to Microsoft technical support for additional information Refer to this Microsoft document for details http microsoft com ntserver nts downloa ds recommended dunl13win95 ReleaseNotes asp Troubleshooting Async Multilink PPP Operations m Chapter2 Diagnosing and Troubleshooting Async Multilink PPP WE Async MPPP Troubleshooting Tables E Troubleshooting Async Multilink PPP Operations Chapter 2 Diagnosing and Troubleshooting Async Multilink PPP Table 2 4 IP connectivity is down Problem Async MPP
9. the debug ppp negotiation Cisco IOS command output will show a CONFREJ a REJect for MRRU and EndPoint Discriminator If you see such an error output ensure that your configuration is correct The debug command output example that follows illustrates the following events 1 The MRRU is CONFACKed agreed upon by both sides for a connection The connection is virtualized A bundle is created first link joins bundle A second connection attempted is detected The MRRU for the second connection is agreed upon by both sides The second connection is virtualized N D S BR DN The second connection is added to multilink bundle Troubleshooting Async Multilink PPP Operations 34 l Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output Cisco IOS debug ppp negotiation Command Output M NAS debug ppp negotiation PPP protocol negotiation debugging is on NAS debug ppp multilink events Multilink events debugging is on NAS NAS NAS show debug PPP PPP protocol negotiation debugging is on Multilink events debugging is on NAS NAS terminal monitor NAS Sep 1 13 52 39 298 UTC As2 IPCP Install route to 172 21 104 25 Sep 1 13 52 41 299 UTC As2 PPP Treating connection as a callin Sep 1 13 52 41 299 UTC As2 PPP Phase is ESTABLISHING Passive Open Sep 1 13 52 41 299 UTC As2 LCP State is Listen Sep 1 13 52 42 287 UTC As2 LCP I CONFREQ Listen id 3 len 46 Sep 1 13 52 42 287 UTC As2 LCP ACCM 0x000A0000
10. to validate Response Username clearlake lan 01 Authentication failure Sep 1 13 16 41 026 UTC As19 CHAP O FAILURE id 4 len 26 msg is Authentication failure NAS NAS Refer to Table 2 2 for related symptom problem and diagnostic notes Troubleshooting Async Multilink PPP Operations n Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output E Cisco 10S show ppp multilink Command Output 3 5 Cisco 10S show ppp multilink Command Output The following show ppp multilink Cisco IOS command output illustrates a situation where a bundle was created using both username and endpoint discriminator and where the bundle has two member links NAS show ppp multilink Virtual Accessl bundle name is clearlake lan 01 b07502c88ec4420014be1 c1553700000 0 lost fragments 0 reordered 0 unassigned sequence 0x23 0x8 rcvd sent 0 discarded 0 lost received 1 255 load Member links 2 max not set min not set Async48 Async46 Refer to Table 2 3 Table 2 4 and Table 2 8 for related symptom problem and diagnostic notes 3 6 Cisco 10S debug ppp negotiation Command Output The following output from debug ppp negotiation and debug ppp multilink events Cisco IOS commands combine to illustrates a situation in which a bundle was created using both username and endpoint discriminator and that the bundle has two member links Note If either end of the link does not support multilink or is not properly configured for multilink
11. 1 3w6d FastEtherneto D 172 21 10 1 32 90 156160 via 172 21 101 20 2w6d FastEtherneto D 172 21 10 7 32 90 412160 via 172 21 101 1 2w6d FastEthernetO D 172 21 10 6 32 90 156160 via 172 21 101 1 6w0d FastEthernetO D 172 21 10 5 32 90 412160 via 172 21 101 1 3w6d FastEthernetO C 172 21 10 10 32 is directly connected Loopbacko C 172 21 104 0 24 is directly connected Loopback1 D 172 21 99 0 24 90 309760 via 172 21 101 1 3w6d FastEthernetO c 172 21 101 0 24 is directly connected FastEtherneto D 172 21 100 0 24 90 309760 via 172 21 101 1 3w6d FastEthernetO D 172 21 102 0 24 90 309760 via 172 21 101 1 2w6d FastEtherneto c 172 21 104 48 32 is directly connected Virtual Access1 D EX 172 22 0 0 16 170 297272576 via 172 21 101 1 3w6d FastEthernetO D EX 0 0 0 0 0 170 309760 via 172 21 101 1 3w6d FastEthernetO Refer to Table 2 4 for related symptom problem and diagnostic notes Troubleshooting Async Multilink PPP Operations
12. 44 792 UTC As5 LCP ACFC 0x0802 Sep 1 13 53 44 792 UTC As5 LCP Callback 6 0x0D0306 Sep 1 13 53 44 792 UTC As5 LCP MRRU 1500 0x110405DC Sep 1 13 53 44 792 UTC As5 LCP EndpointDisc 1 Local Sep 1 13 53 44 792 UTC As5 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 53 44 792 UTC As5 LCP 0x370000 Sep 1 13 53 44 792 UTC As5 LCP O CONFREQ Listen id 17 len 47 Sep 1 13 53 44 792 UTC As5 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 53 44 792 UTC As5 LCP AuthProto CHAP 0x0305C22305 Sep 1 13 53 44 792 UTC As5 LCP MagicNumber 0xA53CC053 0x0506A53CC053 Troubleshooting Async Multilink PPP Operations m Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output E Cisco 10S debug ppp negotiation Command Output Sep 1 13 53 44 792 UTC As5 LCP PFC 0x0702 Sep 1 13 53 44 792 UTC As5 LCP ACFC 0x0802 Sep 1 13 53 44 792 UTC As5 LCP MRRU 1524 0x110405F4 Sep 1 13 53 44 796 UTC As5 LCP EndpointDisc 1 Local Sep 1 13 53 44 796 UTC As5 LCP 0x131201626F62736C616B652D6E61732D Sep 1 13 53 44 796 UTC As5 LCP 0x3031 Sep 1 13 53 44 796 UTC As5 LCP O CONFREJ Listen id 3 len 7 Sep 1 13 53 44 796 UTC As5 LCP Callback 6 0x0D0306 Sep 1 13 53 46 792 UTC As5 LCP TIMEout State REQsent Sep 1 13 53 46 792 UTC As5 LCP O CONFREQ REQsent id 18 len 47 Sep 1 13 53 46 792 UTC As5 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 53 46 792 UTC As5 LCP A
13. 6A53BCC27 Sep 1 13 52 44 287 UTC As2 LCP PFC 0x0702 Sep 1 13 52 44 287 UTC As2 LCP ACFC 0x0802 Sep 1 13 52 44 287 UTC As2 LCP MRRU 1524 0x110405F4 Sep 1 13 52 44 287 UTC As2 LCP EndpointDisc 1 Local Sep 1 13 52 44 287 UTC As2 LCP 0x131201626F62736C616B652D6E61732D Sep 1 13 52 44 287 UTC As2 LCP 0x3031 Sep 1 13 52 44 479 UTC As2 LCP I CONFACK REQsent id 13 len 47 Sep 1 13 52 44 479 UTC As2 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 52 44 479 UTC As2 LCP AuthProto CHAP 0x0305C22305 Sep 1 13 52 44 479 UTC As2 LCP MagicNumber 0xA53BCC27 0x0506A53BCC27 Sep 1 13 52 44 483 UTC As2 LCP PFC 0x0702 Sep 1 13 52 44 483 UTC As2 LCP ACFC 0x0802 Sep 1 13 52 44 483 UTC As2 LCP MRRU 1524 0x110405F4 Sep 1 13 52 44 483 UTC As2 LCP EndpointDisc 1 Local Sep 1 13 52 44 483 UTC As2 LCP 0x131201626F62736C616B652D6E61732D Sep 1 13 52 44 483 UTC As2 LCP 0x3031 Sep 1 13 52 45 279 UTC As2 LCP I CONFREQ ACKrcvd id 4 len 46 Sep 1 13 52 45 283 UTC As2 LCP ACCM 0x000A0000 0x0206000A0000 Troubleshooting Async Multilink PPP Operations m Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output E Cisco 10S debug ppp negotiation Command Output Sep 1 13 52 45 283 UTC As2 LCP MagicNumber 0x0042C48F 0x05060042C48F Sep 1 13 52 45 283 UTC As2 LCP PFC 0x0702 Sep 1 13 52 45 283 UTC As2 LCP ACFC 0x0802 Sep 1 13 52 45 283 UTC A
14. CKrcvd id 3 len 22 Sep 1 13 52 49 011 UTC Vil IPCP Address 172 21 104 48 0x0306AC156830 Sep 1 13 52 49 011 UTC Vil IPCP PrimaryDNS 172 22 53 210 0x8106AC1635D2 Sep 1 13 52 49 011 UTC Vil IPCP SecondaryDNS 171 68 10 70 0x8306AB440A46 Sep 1 13 52 49 203 UTC Vil IPCP I CONFREQ ACKrcvd id 4 len 22 Sep 1 13 52 49 203 UTC Vil IPCP Address 172 21 104 48 0x0306AC156830 Sep 1 13 52 49 203 UTC Vil IPCP PrimaryDNS 172 22 53 210 0x8106AC1635D2 Sep 1 13 52 49 203 UTC Vil IPCP SecondaryDNS 171 68 10 70 0x8306AB440A46 Sep 1 13 52 49 203 UTC Vil IPCP O CONFACK ACKrcvd id 4 len 22 Sep 1 13 52 49 203 UTC Vil IPCP Address 172 21 104 48 0x0306AC156830 Sep 1 13 52 49 203 UTC Vil IPCP PrimaryDNS 172 22 53 210 0x8106AC1635D2 Sep 1 13 52 49 203 UTC Vil IPCP SecondaryDNS 171 68 10 70 0x8306AB440A46 Sep 1 13 52 49 207 UTC Vil IPCP State is Open Sep 1 13 52 49 207 UTC Vil IPCP Install route to 172 21 104 48 NAS NAS Sep 1 13 53 41 928 UTC As5 IPCP Install route to 172 21 104 24 Sep 1 13 53 43 928 UTC As5 PPP Treating connection as a callin Sep 1 13 53 43 928 UTC As5 PPP Phase is ESTABLISHING Passive Open Sep 1 13 53 43 928 UTC As5 LCP State is Listen Sep 1 13 53 44 792 UTC As5 LCP I CONFREQ Listen id 3 len 46 Sep 1 13 53 44 792 UTC A85 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 53 44 792 UTC As5 LCP MagicNumber 0x0043B7F1 0x05060043B7F1 Sep 1 13 53 44 792 UTC As5 LCP PFC 0x0702 Sep 1 13 53
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16. P Troubleshooting Tables W Suggested Diagnostic Steps NAS MP not bundling 1 Use the show ppp multilink Cisco IOS command at the NAS and router to determine if bundling is occurring See the output provided in Cisco IOS show ppp multilink Command Output for additional information 2 Look forthe bundle or user name If bundling is occurring a bundle with the associated user will appear 3 If bundling is not occurring use the debug ppp negotiation and debug ppp multilink events Cisco IOS commands to verify MRRU requests are occurring on both ends and whether a bundle is being created See the output provided in Cisco IOS debug ppp negotiation Command Output for additional information 4 If MRRU requests are not occurring on either end ensure that ppp multilink interface configuration command is configured on all required interfaces Disconnect existing links and reconnect 5 If MRRU requests are being created but bundling is not occurring the refer to the following documents for Cisco IOS configuration information http www cisco com warp customer 79 3 access dial router2router html http www cisco com warp customer 79 3 access dial async multilink html Connection routing if you cannot ping gateway from the client 1 Atthe NAS use the show ip route client_ip_address Cisco IOS command to determine whether the route exists to the remote client via the virtual access inter
17. TC Vil IPCP I CONFREQ REQsent id 1 len 40 Sep 1 13 52 45 843 UTC Vil IPCP CompressType VJ 15 slots CompressSlotID 0x0206002D0F01 Sep 1 13 52 45 843 UTC Vil IPCP Address 0 0 0 0 0x030600000000 Sep 1 13 52 45 843 UTC Vil IPCP PrimaryDNS 0 0 0 0 0x810600000000 Sep 1 13 52 45 843 UTC Vil IPCP PrimaryWINS 0 0 0 0 0x820600000000 Sep 1 13 52 45 843 UTC Vil IPCP SecondaryDNS 0 0 0 0 0x830600000000 Sep 1 13 52 45 843 UTC Vil IPCP SecondaryWINS 0 0 0 0 0x840600000000 Sep 1 13 52 45 843 UTC Vil IPCP Pool returned 172 21 104 48 Sep 1 13 52 45 843 UTC Vil IPCP O CONFREJ REQsent id 1 len 22 Sep 1 13 52 45 843 UTC Vil IPCP CompressType VJ 15 slots CompressSlotID 0x0206002D0F01 E Troubleshooting Async Multilink PPP Operations Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output Cisco IOS debug ppp negotiation Command Output Wi Sep 1 13 52 45 843 UTC Vil IPCP PrimaryWINS 0 0 0 0 0x820600000000 Sep 1 13 52 45 843 UTC Vil IPCP SecondaryWINS 0 0 0 0 0x840600000000 Sep 1 13 52 45 843 UTC Vil CCP I CONFREQ Not negotiated id 1 len 15 Sep 1 13 52 45 843 UTC Vil CCP MS PPC supported bits 0x00000001 0x120600000001 Sep 1 13 52 45 843 UTC Vil CCP Stacker history 1 check mode EXTENDED 0x1105000104 Sep 1 13 52 45 843 UTC Vil LCP O PROTREJ Open id 2 len 21 protocol CCP Sep 1 13 52 45 843 UTC Vil LCP 0x80FD0101000F12060000000111050001
18. Troubleshooting Async Multilink PPP Operations Internetworking Solutions Guide January 2001 Corporate Headquarters Cisco Systems Inc 170 West Tasman Drive San Jose CA 95134 1706 USA http www cisco com Tel 408 526 4000 800 553 NETS 6387 Fax 408 526 4100 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE ALL STATEMENTS INFORMATION AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND EXPRESS OR IMPLIED USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California Berkley UCB as part of UCB s public domain version of the UNIX operating system All rights reserved Copyright 1981 Regents of the University of Ca lifornia NOTWITHSTANDING ANY OTHER WARRANTY HEREIN ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED AS IS WITH ALL FAULTS CISCO AND THE ABOVE NAMED SUPPLIERS DISCLAIM ALL WARRANTIES EXPRESSED OR IMPLIED INCLUDING WITHOUT LIMITATION THOSE OF M
19. down Phone calls last too long Calling too often Calling too infrequently Intermittent user access Troubleshooting Async Multilink PPP Operations z Chapter 2 Diagnosing and Troubleshooting Async Multilink PPP M Async MPPP Troubleshooting Tables Table 2 1 Multilink fails Problem Suggested Diagnostic Steps Phone lines are not functional 1 Dial the PSTN number of the central router listen for modem trainup squelch 2 If this is a problem you will not hear the dial tone or the squelch PC Dialup Networking DUN version 1 2b or 1 Determine if multilink is supported by lower or DUN not supported by client version of PC DUN in verification lab tests a PC running Windows 95 was used 2 Navigate to the Dial Up Networking DUN folder 3 Right click on one of the connections and view properties 4 Verify that the multilink tab appears at the top of the window 5 If not upgrade to a more recent version of PC DUN PC Second modem configured incorrectly 1 Configure the client as discussed in the following document http www cisco com warp public 793 acce ss_dial async_multilink html config 2 Ensure the prefixes are entered correctly 3 Ensure second modem is added 4 Ensure that target dial number is entered correctly 5 Ensure that area code is not included for second modem 6 Also refer to this document e http www cisco com warp public 76 modem _tuning html E Troublesh
20. e central site If the hunt group delivers calls to multiple NASs then ensure that multichassis multilink PPP MMP is implemented correctly in the all the associated NASs Refer to the following three documents for MMP configuration notes http www cisco com warp public 131 3 ht ml http www cisco com warp public 793 acce ss_dial multilink html http www cisco com warp public 793 acce ss_dial 6 html http www cisco com univercd cc td doc p roduct software ios113ed 113ed_cr dial_ c dcprt7 dcmmp htm E Troubleshooting Async Multilink PPP Operations CHAPTER Async Multilink PPP Troubleshooting Diagnostic Output The diagnostic output provided in this chapter present examples illustrating the process of diagnosing problems addressed in Async MPPP Troubleshooting Tables Diagnostic output provided here includes the following e Cisco IOS show isdn status Command Output e Cisco IOS debug isdn q931 Command Output e Cisco IOS show modem summary Command Output e Cisco IOS debug ppp authentication Command Output e Cisco IOS show ppp multilink Command Output e Cisco IOS debug ppp negotiation Command Output e Cisco IOS show processes cpu Command Output e Cisco IOS show ip route Command Output You can use the Output Interpreter tool to analyze the output from some of the commands listed in this chapter The Output Interpreter is available from the following page Cisco Connection Online http www cisco c
21. e trademarks Changing the Way We Work Live Play and Learn Empowering the Internet Generation The Internet Economy and The New Internet Economy are service marks and Aironet ASIST BPX Catalyst Cisco Cisco IOS the Cisco IOS logo Cisco Systems the Cisco Systems logo the Cisco Systems Cisco Press logo Enterprise Solver EtherChannel EtherSwitch FastHub FastLink FastPAD FastS witch GeoTel IOS IP TV IPX LightStream LightSwitch MICA NetRanger Post Routing Pre Routing Registrar StrataView Plus Stratm TeleRouter and VCO are registered trademarks of Cisco Systems Inc or its affiliates in the U S and certain other countries All other tradem arks mentioned in this document are the property of their respective owners The use of the word partner does not imply a partnership relationship betw een Cisco and any of its resellers 0004R Troubleshooting Async Multilink PPP Operations Copyright 2001 Cisco Systems Inc All rights reserved CHAPTER 1 CHAPTER 2 CHAPTER 3 CONTENTS Async Multilink PPP Troubleshooting Overview 1 1 Overview of Async MPPP Network Arrangement 1 2 Related Documents 1 2 Troubleshooting Basics for Async Multilink PPP 1 3 Troubleshooting Methodology Overview 1 3 Cisco IOS Debug Command Summary 1 3 Troubleshooting Async MPPP Operational Problems 1 4 Diagnosing and Troubleshooting Async Multilink P PP 2 1 Async MPPP Troubleshooting Tables 2 1 Async Multilink PPP Troubleshooti
22. exists and is directly connected via Virtual Access1 NAS show ip route 172 21 104 48 Routing entry for 172 21 104 48 32 Known via connected distance 0 metric 0 connected via interface Redistributing via eigrp 1 Advertised by eigrp 1 Routing Descriptor Blocks directly connected via Virtual Access1 Route metric is 0 traffic share count is 1 Troubleshooting Async Multilink PPP Operations n Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output HZ Cisco 10S show ip route Command Output Another option is to use the generic form of the command However using this command can result in a long output when large routing tables exist in a NAS or router The following is an example of a show ip route output with a very small routing table where the client IP address 172 21 104 48 is found NAS show ip route Codes C D connected S static I IGRP R RIP M mobile B BGP EIGRP EX EIGRP external O OSPF IA OSPF inter area N1 OSPF NSSA external type 1 N2 OSPF NSSA external type 2 El OSPF external type 1 E2 OSPF external type 2 E EGP i P Gateway of IS IS L1 IS IS level 1 L2 IS IS level 2 ia IS IS inter area candidate default U per user static route o ODR periodic downloaded static route last resort is 172 21 101 1 to network 0 0 0 0 172 21 0 0 16 is variably subnetted 12 subnets 2 masks D 172 21 200 0 24 90 284160 via 172 21 101
23. face See the output provided in Cisco IOS show ip route Command Output for additional information 2 If the route does show up determine whether you can ping from a remote client to the gateway of the NAS 3 If this ping succeeds problem is outside the NAS Troubleshooting Async Multilink PPP Operations x Chapter2 Diagnosing and Troubleshooting Async Multilink PPP M Async MPPP Troubleshooting Tables Table 2 5 Phone calls last too long Problem Suggested Diagnostic Steps PC User not using suspend resume button in When all connections are established you can DUN screen either view status information about the link by double clicking on the Communicating Computers icon displayed in the taskbar or you may disconnect the connection Click on Details to verify that the connection is using multiple devices When you select a device in the list box a Suspend or Resume button appears If a Suspend button appears the device is now in use and bundled into the multilink connection Clicking on the Suspend button disconnects that line and removes the line from the bundled connections If the Resume button appears click it to dial that connection and add that line to the bundle You can dynamically suspend each connection without dropping the entire multilink session Router Configuration tuning problems Refer to the following document for tuning notes Da load threshold
24. h external modems enter the ATM1 command to enable the modem s speaker 6 Enter the arpt command to verify that a dial tome can be detected by the modem If you do not hear a dial tone troubleshoot the modem 1 Terminate telnet command From the Cisco IOS command line press Ctr1 shift 6 then press the x key 8 Enter disconnect at the Cisco IOS EXEC prompt Troubleshooting Async Multilink PPP Operations Chapter2 Diagnosing and Troubleshooting Async Multilink PPP Async MPPP Troubleshooting Tables W Table 2 2 Calls fail to connect Problem Suggested Diagnostic Steps Router Cisco IOS version does not support Async K MPPP Note Async MPPP requires Cisco IOS 11 0 3 or higher 1 Use show version Cisco IOS EXEC command to ensure that software is Cisco IOS 11 0 3 or higher 2 If not upgrade to Cisco IOS 11 0 3 or higher Router Configuration problems Ensure that the configuration conforms to the basic command setup as illustrated in the following related document http www cisco com warp customer 793 ac cess dial router2router html http www cisco com warp customer 793 ac cess dial async multilink html Troubleshooting Async Multilink PPP Operations x Chapter 2 Diagnosing and Troubleshooting Async Multilink PPP M Async MPPP Troubleshooting Tables Table 2 3 Poor performance Problem Suggested Diagnostic Steps NAS MP not bundling
25. he remote node scenario The remote LAN version differs in that instead of being connected to a PC client the remote modems are connected to a Cisco router such as a Cisco 2604 Figure 1 1 Analog MPPP Remote Node Services lines a yy Corporate network Client Two modems L amp ami DNS Default server j gateway gt Corporate intranet a Internet M HZ firewall my Internet One TI PRI line Cisco AS5300 28007 1 1 1 Related Documents The troubleshooting content provided in this document is based on content provided in two closely related documents http www cisco com warp customer 793 access dial router2router html e http www cisco com warp customer 793 access dial async multilink html Troubleshooting Async Multilink PPP Operations 1 2 Chapter1 Async Multilink PPP Troubleshooting Overview Troubleshooting Basics for Async Multilink PPP W 1 2 Troubleshooting Basics for Async Multilink PPP These sections help you to accomplish the following tasks e Troubleshooting Methodology Overview e Cisco IOS Debug Command Summary 1 2 1 Troubleshooting Methodology Overview The troubleshooting methodology adopted in this chapter follows these general steps 1 Isolating the problem Gathering detailed information about problem Determining the starting point as well as fault isolation procedures 2 Correcting the problem Making appr
26. m the NAS use the show modem summary Cisco IOS command to verify that modems are available See the output provided in Cisco IOS show modem summary Command Output for additional information 2 Verify that there are enough modems available Troubleshooting Async Multilink PPP Operations s Chapter 2 Diagnosing and Troubleshooting Async Multilink PPP M Async MPPP Troubleshooting Tables Table 2 8 Intermittent user access Problem Suggested Diagnostic Steps PC Multiple users with same name attempting to access central site NAS amp Note Please refer to the following document for related information http www cisco com warp public 131 mppp_bundle name html 1 If users are dialing in from multiple client PCs with the same user name configure the Cisco IOS command multilink bundle name both in the central site NAS configuration This command forces the NAS to create a bundle consisting of the user name and the endpoint discriminator of the client Use the show ppp multilink command to verify that the bundle name includes both the user name and the endpoint discriminator See the output provided in Cisco IOS show ppp multilink Command Output for additional information NAS Telco hunt groups implemented at central site spanning multiple NASs Determine whether the Telco has implemented hunt groups and whether the hunt groups connect to multiple NASs at the th
27. ng Diagnostic Output 3 1 Cisco IOS show isdn status Command Output 3 1 isco IOS debug isdn q931 Command Output 3 2 isco IOS show modem summary Command Output 3 3 isco IOS debug ppp authentication Command Output 3 3 isco IOS debug ppp negotiation Command Output 3 4 isco IOS show processes cpu Command Output 3 9 C C C Cisco IOS show ppp multilink Command Output 3 4 C C C isco IOS show ip route Command Output 3 9 Troubleshooting Async Multilink PPP Operations z M Contents E Troubleshooting Async Multilink PPP Operations CHAPTER 1 Async Multilink PPP Troubleshooting Overview In general this document focuses on diagnosing and troubleshooting typical async multilink PPP problems This chapter addresses the following topics e Overview of Async MPPP Network Arrangement e Troubleshooting Basics for Async Multilink PPP The two chapters that follow focus on these topics e Diagnosing and Troubleshooting Async Multilink PPP e Async Multilink PPP Troubleshooting Diagnostic Output Troubleshooting Async Multilink PPP Operations Chapter 1 Async Multilink PPP Troubleshooting Overview M Overview of Async MPPP Network Arrangement 1 1 Overview of Async MPPP Network Arrangement This document assumes that e Each PC client has access to two POTs lines e The Cisco AS5x00 already has its hardware commissioned and all Cisco IOS basics are configured Figure 1 1 shows the network topology used for t
28. om support OutputInterpreter Refer to the Output Interpreter for a list of the commands it accepts 3 1 Cisco 10S show isdn status Command Output In the following example the ISDN status messages are as expected Layer 1 status is ACTIVE Layer 2 status is in State MULTIPLE_FRAME_ ESTABLISHED amp Note Layer 1 must be in ACTIVE state and Layer 2 must be in STATE MULTIPLE FRAME _ESTABLISHED for a connection to be successfully completed Troubleshooting Async Multilink PPP Operations Eu Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output M Cisco 10S debug isdn q931 Command Output NAS show isdn status Global ISDN Switchtype primary 5ess ISDN Serial0 23 interface dsl 0 interface ISDN Switchtype primary 5ess Layer 1 Status ACTIVE Layer 2 Status TEI 0 Ces 1 SAPI 0 State MULTIPLE FRAME ESTABLISHED Layer 3 Status 0 Active Layer 3 Call s Activated dsl 0 CCBs 0 The Free Channel Mask Ox807FFFFF Refer to Table 2 2 for related symptom problem and diagnostic notes The following is the output interpreter result for the above output indicating that the connection is behaving properly SHOW ISDN STATUS NOTIFICATIONS if any Layers 1 and 2 Q 921 of the ISDN interfaces are operating normally Note Access the Output Interpreter from this location http www cisco com support OutputInterpreter 3 2 Cisco 10S debug isdn g931 Command Output In the following e
29. ooting Async Multilink PPP Operations Chapter2 Diagnosing and Troubleshooting Async Multilink PPP Table 2 1 Multilink fails Problem Async MPPP Troubleshooting Tables W Suggested Diagnostic Steps Router Modem failure 1 Reverse telnet to each modem separately a Refer to the following document for notes about reverse telnet http www cisco com univercd cc td d oc product software ios120 12cgcr d ial_c dertelnt htm Enter the at command Look for ok response If ok is not returned troubleshoot hardware for other problems For routers with external modems enter the ATM1 command to enable the modem s speaker Enter the ATDT command to verify that a dial tome can be detected by the modem If you do not hear a dial tone troubleshoot the modem Terminate telnet command From the Cisco IOS command line press Ctr1 shift 6 then press the x key Enter disconnect at the Cisco IOS EXEC prompt Router Cisco IOS version does not support Async MPPP wy Note Async MPPP requires Cisco IOS 11 0 3 or higher Use show version Cisco IOS EXEC command to ensure that software is Cisco IOS 11 0 3 or higher If not upgrade to Cisco IOS 11 0 3 or higher Router Configuration problems Ensure that the configuration conforms to the basic command setup as illustrated in the following related document http www cisco com warp public 793 acce ss_dial router2router html
30. opriate hardware software or configuration changes to correct the problem 3 Verifying that the trouble is corrected Performing operational tests to verify that trouble is corrected The troubleshooting tables presented in Diagnosing and Troubleshooting Async Multilink PPP and the example scenarios presented in Async Multilink PPP Troubleshooting Diagnostic Output generally follow this methodology in listing typical symptoms and provide associated problems and diagnostics measures 1 2 2 Cisco IOS Debug Command Summary Output from Cisco IOS debug commands provide a valuable source of information and feedback concerning state transitions and functions when assessing problems in an async MPPP environment Use the debug commands cited in the following documents for capturing async MPPP related transitions and functions e http www cisco com warp public 793 access dial router2router html commands e http www cisco com warp public 793 access dial async_multilink html verification Troubleshooting Async Multilink PPP Operations m Chapter1 Async Multilink PPP Troubleshooting Overview M Troubleshooting Basics for Async Multilink PPP 1 2 3 Troubleshooting Async MPPP Operational Problems amp Async MPPP operational diagnostic activity for access environments is divided into the following basic areas e Remote client to central site router access e Remote LAN to central site router access In addition
31. outgoing modems are detected NAS show modem summary Avg Hold Incoming calls Outgoing calls Busied Failed No Suce Time Succ Fail Avail Succ Fail Avail Out Dial Ans Pct 00 00 24 1 0 48 0 0 48 0 0 0 100 Refer to Table 2 2 for related symptom problem and diagnostic notes 3 4 Cisco IOS debug ppp authentication Command Output In the following example command output the first and second connections are authencticated but the third connection fails authentication NAS debug ppp authentication PPP authentication debugging is on NAS Sep 1 13 11 27 683 UTC As47 PPP Treating connection as a callin Sep 1 13 11 31 843 UTC As47 CHAP O CHALLENGE id 5 len 36 from NAS Sep 1 13 11 32 019 UTC As47 CHAP I RESPONSE id 5 len 37 from clearlake lan 01 Sep 1 13 11 32 019 UTC As47 CHAP O SUCCESS id 5 len 4 Sep 1 13 11 32 123 UTC Vi3 PPP Treating connection as a dedicated line Sep 1 13 12 43 957 UTC As35 PPP Treating connection as a callin Sep 1 13 12 48 041 UTC As35 CHAP O CHALLENGE id 5 len 36 from NAS Sep 1 13 12 48 277 UTC As35 CHAP I RESPONSE id 5 len 37 from clearlake lan 01 Sep 1 13 12 48 281 UTC As35 CHAP O SUCCESS id 5 len 4 NAS NAS Sep 13 16 36 802 UTC As19 PPP Treating connection as a callin 1 Sep 1 13 16 40 834 UTC As19 CHAP O CHALLENGE id 4 len 36 from NAS Sep 1 13 16 41 026 UTC As19 CHAP I RESPONSE id 4 len 37 from clearlake lan 01 Sep 1 13 16 41 026 UTC As19 CHAP Unable
32. s Open Sep 1 13 52 45 475 UTC As2 PPP Phase is AUTHENTICATING by this end Sep 1 13 52 45 475 UTC As2 CHAP O CHALLENGE id 5 len 36 from NAS Sep 1 13 52 45 667 UTC As2 CHAP I RESPONSE id 5 len 37 from clearlake lan 01 Sep 1 13 52 45 667 UTC As2 CHAP O SUCCESS id 5 len 4 Sep 1 13 52 45 667 UTC As2 MLP Multilink up event pending Sep 1 13 52 45 667 UTC As2 PPP Phase is VIRTUALIZED Sep 1 13 52 45 667 UTC Vil PPP Phase is DOWN Setup Sep 1 13 52 45 667 UTC Vil MLP VP Clone from Vtemplate 1 block 1 Sep 1 13 52 45 767 UTC Vil PPP Treating connection as a dedicated line Sep 1 13 52 45 767 UTC Vil PPP Phase is ESTABLISHING Active Open Sep 1 13 52 45 771 UTC Vil LCP O CONFREQ Closed id 1 len 37 Sep 1 13 52 45 771 UTC Vil LCP AuthProto CHAP 0x0305C22305 Sep 1 13 52 45 771 UTC Vil LCP MagicNumber 0xA53BD9C1 0x0506A53BD9C1 Sep 1 13 52 45 771 UTC Vil LCP MRRU 1524 0x110405F4 Sep 1 13 52 45 771 UTC Vil LCP EndpointDisc 1 Local Sep 1 13 52 45 771 UTC Vil LCP 0x131201626F62736C616B652D6E61732D Sep 1 13 52 45 771 UTC Vil LCP 0x3031 Sep 1 13 52 45 771 UTC Vil PPP Phase is UP Sep 1 13 52 45 771 UTC Vil IPCP O CONFREQ Closed id 1 len 10 Sep 1 13 52 45 771 UTC Vil IPCP Address 172 21 104 254 0x0306AC1568FE Sep 1 13 52 45 771 UTC As2 MLP clearlake lan 01 b07502c88ec4420014be1fc155370000 multilink up first link Sep 1 13 52 45 771 UTC As2 IPCP Remove route to 172 21 104 25 Sep 1 13 52 45 843 U
33. s2 LCP Callback 6 0x0D0306 Sep 1 13 52 45 283 UTC As2 LCP MRRU 1500 0x110405DC Sep 1 13 52 45 283 UTC As2 LCP EndpointDisc 1 Local Sep 1 13 52 45 283 UTC As2 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 52 45 283 UTC As2 LCP 0x370000 Sep 1 13 52 45 283 UTC As2 LCP O CONFREJ ACKrcvd id 4 len 7 Sep 1 13 52 45 283 UTC As2 LCP Callback 6 0x0D0306 Sep 1 13 52 45 475 UTC As2 LCP I CONFREQ ACKrcvd id 5 len 43 Sep 1 13 52 45 475 UTC As2 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 52 45 475 UTC As2 LCP MagicNumber 0x0042C48F 0x05060042C48F Sep 1 13 52 45 475 UTC As2 LCP PFC 0x0702 Sep 1 13 52 45 475 UTC As2 LCP ACFC 0x0802 Sep 1 13 52 45 475 UTC As2 LCP MRRU 1500 0x110405DC Sep 1 13 52 45 475 UTC As2 LCP EndpointDisc 1 Local Sep 1 13 52 45 475 UTC As2 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 52 45 475 UTC As2 LCP 0x370000 Sep 1 13 52 45 475 UTC As2 LCP O CONFACK ACKrcvd id 5 len 43 Sep 1 13 52 45 475 UTC As2 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 52 45 475 UTC As2 LCP MagicNumber 0x0042C48F 0x05060042C48F Sep 1 13 52 45 475 UTC As2 LCP PFC 0x0702 Sep 1 13 52 45 475 UTC As2 LCP ACFC 0x0802 Sep 1 13 52 45 475 UTC As2 LCP MRRU 1500 0x110405DC Sep 1 13 52 45 475 UTC As2 LCP EndpointDisc 1 Local Sep 1 13 52 45 475 UTC As2 LCP 0x131301B07502C88EC4420014BE1FC155 Sep 1 13 52 45 475 UTC As2 LCP 0x370000 Sep 1 13 52 45 475 UTC As2 LCP State i
34. set lo related to these configuration commands http www cisco com warp customer 793 ac e dialer idle timeout set too lon 8 cess_dial router2router html tuning e Interesting traffic improperly defined e ppp timeout multilink link remove set too long Table 2 6 Calling too often Problem Suggested Diagnostic Steps Router Configuration tuning problems Refer to the following document for tuning notes a dialer Toad threshold seeing ow related to these configuration commands http www cisco com warp customer 793 ac e dialer idle timeout set too short cess dial router2router html tuning e Interesting traffic improperly defined e ppp timeout multilink link add set too short Troubleshooting Async Multilink PPP Operations 2 10 l Chapter 2 Diagnosing and Troubleshooting Async Multilink PPP Table 2 7 Calling too infrequently Problem Async MPPP Troubleshooting Tables W Suggested Diagnostic Steps Router Configuration tuning problems e dialer load threshold set too high e Interesting traffic improperly defined e ppp timeout multilink link add set too long Refer to the following document for tuning notes related to these configuration commands http www cisco com warp customer 793 ac cess dial router2router html tuning Table 2 8 Intermittent user access Problem Suggested Diagnostic Steps Too few modems for application lines are too busy 1 Fro
35. uthProto CHAP 0x0305C22305 Sep 1 13 53 46 792 UTC As5 LCP MagicNumber 0xA53CC053 0x0506A53CC053 Sep 1 13 53 46 792 UTC As5 LCP PFC 0x0702 Sep 1 13 53 46 792 UTC As5 LCP ACFC 0x0802 Sep 1 13 53 46 792 UTC As5 LCP MRRU 1524 0x110405F4 Sep 1 13 53 46 792 UTC As5 LCP EndpointDisc 1 Local Sep 1 13 53 46 792 UTC As5 LCP 0x131201626F62736C616B652D6E61732D Sep 1 13 53 46 792 UTC As5 LCP 0x3031 Sep 1 13 53 47 032 UTC As5 LCP I CONFACK REQsent id 18 len 47 Sep 1 13 53 47 032 UTC As5 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 53 47 032 UTC As5 LCP AuthProto CHAP 0x0305C22305 Sep 1 13 53 47 032 UTC As5 LCP MagicNumber 0xA53CC053 0x0506A53CC053 Sep 1 13 53 47 032 UTC As5 LCP PFC 0x0702 Sep 1 13 53 47 032 UTC As5 LCP ACFC 0x0802 Sep 1 13 53 47 032 UTC As5 LCP MRRU 1524 0x110405F4 Sep 1 13 53 47 032 UTC As5 LCP EndpointDisc 1 Local Sep 1 13 53 47 032 UTC As5 LCP 0x131201626F62736C616B652D6E61732D Sep 1 13 53 47 032 UTC As5 LCP 0x3031 Sep 1 13 53 47 800 UTC As5 LCP I CONFREQ ACKrcvd id 4 len 46 Sep 1 13 53 47 800 UTC As5 LCP ACCM 0x000A0000 0x0206000A0000 Sep 1 13 53 47 800 UTC As5 LCP MagicNumber 0x0043B7F1 0x05060043B7F1 Sep 1 13 53 47 800 UTC As5 LCP PFC 0x0702 Sep 1 13 53 47 800 UTC As5 LCP ACFC 0x0802 Sep 1 13 53 47 800 UTC As5 LCP Callback 6 0x0D0306 Sep 1 13 53 47 800 UTC As5 LCP MRRU 1500 0x110405DC Sep 1 13 53 47 804 UTC As5 LCP EndpointDisc 1
36. xample output the NAS receives a call setup message from the switch If the NAS does not receive a setup message verify that the PRI is functioning correctly The NAS then transmits a call processing message The last line of this output shows that the call is successfully connected NAS debug isdn q931 ISDN Q931 packets debugging is on NAS Aug 31 19 12 25 890 UTC ISDN Se0 23 RX lt SETUP pd 8 callref 0x015D Aug 31 19 12 25 890 UTC Bearer Capability i 0x9090A2 Aug 31 19 12 25 890 UTC Channel ID i 0xA98381 Aug 31 19 12 25 890 UTC Called Party Number i OxC1 3241937 Aug 31 19 12 25 894 UTC ISDN Se0 23 TX gt CALL PROC pd 8 callref 0x815D Aug 31 19 12 25 894 UTC Channel ID i 0xA98381 Aug 31 19 12 25 894 UTC ISDN Se0 23 TX gt ALERTING pd 8 callref 0x815D Aug 31 19 12 25 998 UTC ISDN Se0 23 TX gt CONNECT pd 8 callref 0x815D Aug 3 9 12 26 030 UTC ISDN Se0 23 RX lt CONNECT ACK pd 8 callref 0x015D Aug 31 19 12 26 030 UTC ISDN Se0 23 CALL PROGRESS CALL CONNECTED call id 0x190 bchan 1 dsl 0 Refer to Table 2 2 for related symptom problem and diagnostic notes E Troubleshooting Async Multilink PPP Operations Chapter3 Async Multilink PPP Troubleshooting Diagnostic Output Cisco 10S show modem summary Command Output W 3 3 Cisco 10S show modem summary Command Output In the following example command output 48 available incoming modems and 48 available
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