3com 8807 User Guide

# Configure a default route pointing to PE1 on CE2.

[CE2] ip route-static 0.0.0.0 0.0.0.0 20.1.1.2 

# Configure a multiple-role host route on PE1.

[PE1] ip route-static vpn-instance vpn1 172.16.0.0 16 vpn2 20.1.1.1 

# Import the route of VPN1 to VPN2 using the RT attribute.

[PE1] ip vpn-instance vpn2

 

[PE1-vpn-vpn2] vpn-target 100:1 import-extcommunity 

In central server topology networking mode, the local end switch (spoke PE) 
cannot learn the routing information of the peer end switch (spoke PE).

■

Check whether the BGP adjacent of spoke PE and hub PE is created correctly.

■

Check whether the routing attributes import/export relation of each 
VPN-instance is correct.

■

Check from the hub PE that whether the routing information between two 
VPN instances can be learnt by each other. if not, perform the following 
operation: check if the EBGP protocol runs between hub PE and hub CE, check 
whether the peer peer-address allow-as-loop command is configured 
between PE and CE.

PE at the local end can learn private network route of the PE at peer end, but two 
PEs cannot intercommunicate with each other.

■

Check whether the loopback interface configured on the PE has the address 
with 32-bit mask.

■

Check whether the tag of private network route is correct.

■

Check whether the LDP session is established using the display mpls ldp 
session command.

■

Check whether the LSP tunnel is established using the display mpls lsp 
command.

In Hub&Spoke networking mode, spoke PE cannot learn the private networking 
route of Hub PE.

■

Check whether the LSP tunnel is established using the display mpls lsp 
command.