Network Router User Manual

Nortel Secure Router 8000 Series
Troubleshooting - VPN
Issue 5.3 (19 January 2009)
Nortel Networks Inc.
iii
4.2.1 Typical networking............................................................................................................................4-8
4.2.2 Configuration notes.........................................................................................................................4-10
4.2.3 Troubleshooting flowchart ..............................................................................................................4-13
4.2.4 Troubleshooting procedure..............................................................................................................4-14
4.3 Troubleshooting cases ...............................................................................................................................4-17
4.3.1 VC type is not supported when setting up a PW on an ATM subinterface......................................4-17
4.3.2 A static PW cannot be switched with other PWs.............................................................................4-19
4.3.3 Switch-L2VC is down after PW switching configuration...............................................................4-21
4.3.4 PW attributes cannot be changed by using the reset pw command.................................................4-22
4.3.5 VC is up but the PPP session cannot establish ................................................................................4-26
4.3.6 VC under the interface is missing after the link protocol changes..................................................4-27
4.3.7 Both the session and the AC are up, but the VC cannot be up ........................................................4-29
4.3.8 Ethernet interconnects with ATM, the VC is up, but the ping between CEs fails ...........................4-33
4.3.9 CEs cannot communicate by using the accessing mode of VLAN .................................................4-35
4.3.10 CEs cannot access each other though the static VC is up..............................................................4-35
4.3.11 VC is down though AC is up.........................................................................................................4-37
4.3.12 Large-sized packets are lost between CEs on two ends of Layer 2 VPN ......................................4-38
4.3.13 Failure to establish the MPLS LDP session between PEs when RIP-1 is used in the Layer 2 VPN
backbone
..................................................................................................................................................4-39
4.4 FAQs..........................................................................................................................................................4-40
4.5 Diagnostic tools.........................................................................................................................................4-44
4.5.1 display commands...........................................................................................................................4-44
4.5.2 debugging commands......................................................................................................................4-45
5 VPLS troubleshooting...............................................................................................................5-1
5.1 VPLS overview ...........................................................................................................................................5-2
5.1.1 Related concepts of VPLS.................................................................................................................5-2
5.1.2 Encapsulation type ............................................................................................................................5-3
5.1.3 MTU..................................................................................................................................................5-4
5.2 VPLS troubleshooting .................................................................................................................................5-4
5.2.1 Typical networking............................................................................................................................5-4
5.2.2 Configuration notes...........................................................................................................................5-6
5.2.3 Troubleshooting flowchart ..............................................................................................................5-10
5.2.4 Troubleshooting procedures ............................................................................................................5-10
5.3 Troubleshooting cases ...............................................................................................................................5-11
5.3.1 A VSI cannot be up in LDP signaling mode....................................................................................5-12
5.3.2 Packets cannot forward successfully between two PEs though VSI is up.......................................5-14
5.3.3 A VSI cannot be up in BGP signaling mode....................................................................................5-15
5.4 FAQs..........................................................................................................................................................5-17
5.5 Diagnostic tools.........................................................................................................................................5-19
5.5.1 display commands...........................................................................................................................5-19
5.5.2 debugging command .......................................................................................................................5-20