Panasonic NN46240-710 - Manual (Page 126)

4 MPLS L2VPN troubleshooting
Nortel Secure Router 8000 Series
_________ Troubleshooting - VPN
Remote CCC connection: Run the display ccc command to check that the label at both
ends match. For a same CCC connection, the egress label of one end must be the ingress
label of another end as shown in Figure 4-12.
Figure 4-12 Sketch map of the CCC remote connection label
2. Check that the BGP connection or the MPLS LDP session establishes successfully.
• If LDP is used as the signaling protocol, use the display mpls ldp session command to
check the establishment of a session. If PEs connect indirectly, the MPLS LDP remote
session needs to be set up between PEs.
• If BGP is used as the signaling protocol, use the display bgp vpnv4 vpn-instance
vpn-instance-nam all peer command to check that the BGP session establishes
successfully.
For the diagnosis of MPLS LDP session faults, see 3 BGP/MPLS IP VPN troubleshooting.
For BGP troubleshooting, see Nortel Secure Router 8000 Series Troubleshooting - IP Routing
(NN46240-706).
If the BGP connection or the MPLS LDP session establishes successfully, but still the Layer 2
VPN cannot be set up, perform the following checks.
3. Check that the negotiated parameters match.
Parameter mismatch can appear in various forms, as in the following examples:
• The maximum transmission unit (MTU) of one end is 1500 bytes, but that of the other end
is 4470 bytes.
• One end supports CW while the other end does not.
• One end is encapsulated with PPP while the other end is encapsulated with Ethernet.
If the negotiated parameters mismatch, modify them to be consistent.
In the case of the heterogeneous-media interconnection, the encapsulation type of the
connection must be IP-interworking.
If the status of VC is Down even after the configuration, do as follows.
Step 4 Do as follows in the case of the local connection.
Check that the encapsulation types are consistent on both local and remote ends if the local
connection.
Step 5 Check whether the link negotiation between CE and PE succeeds when heterogeneous media
interconnect.
If the negotiated parameters of the link between CE and PE mismatch, modify them to be
consistent.
In the case of the Ethernet network, check that local ce-mac or local ce-ip is configured.
4-16 Nortel Networks Inc. Issue 5.3 (30 March2009)