Panasonic NN46240-710 User Manual
Page 101
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3 BGP/MPLS IP VPN troubleshooting
Nortel Secure Router 8000 Series
_________ Troubleshooting - VPN
• The undo policy vpn-target command is not configured for BGP on ASBR.
Q: LDP configuration between routers is correct, and the route is correct but the
establishment of LSP fails. What is the reason?
A: The reason can be that the next hop of the route mismatches with the next hop of the LSP.
To validate the LSP, the next hop of the LSP must exactly match with the next hop of the route.
Q: In Inter-AS VPN Option B, the ASBR does not forward the VPNv4 route
forwarded by another ASBR. What is the reason?
A: The reason can be that the interface that connects with the ASBR is not enabled with MPLS.
As a result, the label does not apply successfully and the LSP cannot establish, thereby causing
failure to distribute VPNv4 routes.
Q: Why do I fail to find the route after running the display ip routing-table
vpn-instance command?
A: This command does not display the route in an inactive state. Routes in an inactive state can
occur if no tunnel exists. You can run the display ip routing-table vpn-instance
vpn-instance-name ip-address [ mask | mask-length ] verbose command to view detailed
information on routes.
Q: Why can the route reflector not forward private network routes after the
VPNv4 adjacency establishes between two customers?
A: You must run the undo policy vpn-target command in VPNv4 address family on the route
reflector. The route reflector can receive and forward the private network routes even when no
VPN configuration exists.
Q: Both the LDP LSP and the GRE LSP exist. Why can the router not choose the
GRE LSP automatically after the LDP LSP is down?
A: The problem can be that no tunnel policy configuration exists in the VPN view.
Q: The peer
peer-ip-address
next-hop-local command has been configured for the
reflector. Why does the forwarded route not change the next hop?
A: In the Secure Router 8000 Series implementation, after the next hop changes, labels are
reallocated for routes, but the reflector does not change the route label. After the peer
peer-ip-address next-hop-local is configured, the next hop of the route cannot change even if
the peer peer-ip-address next-hop-local is configured.
3-22
Nortel Networks Inc.
Issue 5.3 (30 March2009)