Panasonic NN46240-710 - Manual (Page 139)

Nortel Secure Router 8000 Series
Troubleshooting - VPN___________ 4 MPLS L2VPN troubleshooting
Last change time 0 days, 0 hours, 8 minute S, 26 S6C0nds
Fault analysis
If an interface (POS 4/1/0 for example) on PE has an HDLC-type PW with the ID of 1, and you
change the link layer protocol of another interface (POS 4/0/0 for example) to HDLC, the
system deletes the PW under POS 4/0/0 automatically. The reason is that the two PWs have the
same VC ID and the same VC type.
Troubleshooting procedure
Step 1 If you need to change the link layer protocol of a VC, ensure that no identical PW ID and VC
type are configured on other interfaces of the same router.
—End
Summary
The combination of VC ID and VC type must be unique on the same router.
If a VC changes its link protocol type and this causes a conflict with the other VCs, the VC is
automatically deleted.
4.3.7 Both the session and the AC are up, but the VC cannot be up
Fault symptom
Figure 4-16 Networking diagram
PE1
Ethernet1/0/0
10.1.1.2/24
Ethernet1/0/0
10.1.1.1/24
CE1
Ethernet2/0/0
100.1.1.1/24
Ethernet2/0/0 PE2
100.1.1.2/24,^^
Ethernet1/0/0
10.1.1.1/24
GbE1/0/0^^^
10.1.1.2/24 ^
CE2
As shown in Figure 4-16, the VC is not Up after you configure the Martini MPLS Layer 2 VPN.
Check the session and the AC, and find both of them are Up.
Fault analysis
Use the display mpls l2vc vc-id command on PE to check the MTU value for consistency. For
example:
# Check the MTU value of the Ethernet interface on PE1:
[PE1-Ethernet1/0/0] display mpls l2vc 100
Total ldp vc : 1 0 up 1 down
*Client Interface : Ethernet1/0/0
Issue 5.3 (30 March 2009) Nortel Networks Inc. 4-29