Panasonic NN46240-710 - Manual (Page 95)

3 BGP/MPLS IP VPN troubleshooting
Nortel Secure Router 8000 Series
_________ Troubleshooting - VPN
ip address 192.168.1.2 255.255.255.0
mpls
#
The preceding display shows that MPLS LDP is not enabled in the interface view.
Troubleshooting procedure
Step 1 Use the display ip routing-table vpn-instance command on the remote PE to view whether
there are local VPN routes in the VPN routing table. If local VPN routes exist, it implies that the
routes in the RM are active; otherwise, the routes are inactive.
Step 2 If the remote PE has no local VPN routes, use the display ip routing-table vpn-instance
vpn-instance-name ip-address [ mask | mask-length ] verbose command on the remote PE to
view the Tunnel ID, State, and the next hop of the route. If the local PE does not have the
detailed information about the route, use the display bgp vpnv4 all peer [ ipv4-address ]
verbose command to check whether the BGP VPNv4 peer is set up successfully.
Step 3 If the Tunnel ID is 0x0 and the State is Inactive Adv WaitQ, use the display mpls lsp include
nexthop-address 32 command to check for the LSP to the next hop of the route.
Step 4 If no LSP exists, check whether MPLS LDP is enabled on the interface that connects PE1 and P,
and on the interface that connects P and PE2.
Step 5 If MPLS LDP is not enabled on the interface, configure MPLS LDP in the interface view.
----End
Summary
To transfer the traffic of a private network across the public network, you need a public network
tunnel.
If the setup of a public network tunnel fails, the reason can be that MPLS LDP is not enabled on
the interface, or that an LDP session is not established. This leads to the PE failure to send
private network routes to CE.
3-16 Nortel Networks Inc. Issue 5.3 (30 March2009)