Configuration procedure – H3C Technologies H3C SR8800 User Manual
Page 357
346
PE 1
Loop0
1.1.1.9/32
GE4/1/2 30.1.1.1/24
GE4/1/1
10.1.1.2/24
PE
2
Loop0
3.3.3.9/32
GE4/1/2
20.1.1.1/24
GE4/1/1 10.2.1.2/24
CE 2
GE4/1/1
10.2.1.1/24
GE4/1/2 30.1.1.2/24
GE4/1/2
200.1.1.1/24
Configuration procedure
1.
Configure basic MPLS L3VPN
•
Configure OSPF on the MPLS backbone to allow the PEs and P device to learn the routes of the
loopback interfaces from each other.
•
Configure basic MPLS and MPLS LDP on the MPLS backbone to establish LDP LSPs.
•
Establish MP-IBGP peer relationship between the PEs to advertise VPN IPv4 routes.
•
Configure the VPN instance of VPN 1 on PE 2 to allow CE 2 to access the network.
•
Configure the VPN instance of VPN 1 on PE 1 to allow CE 1 to access the network.
•
Configure BGP between PE 1 and CE 1, and between PE 2 and CE 2 to inject routes of CEs into PEs.
After completing the configurations, issue the display ip routing-table command on CE 2. You can see
that CE 2 has learned the route to network segment 10.1.1.0/24, where the interface used by CE 1 to
access PE 1 resides; but has not learned the route to the VPN (100.1.1.0/24) behind CE 1. The situation
on CE 1 is similar.
Routing Tables: Public
Destinations : 8 Routes : 8
Destination/Mask Proto Pre Cost NextHop Interface
10.1.1.0/24 BGP 255 0 10.2.1.2 GE4/1/1
10.1.1.1/32 BGP 255 0 10.2.1.2 GE4/1/1
10.2.1.0/24 Direct 0 0 10.2.1.1 GE4/1/1
10.2.1.1/32 Direct 0 0 127.0.0.1 InLoop0
10.2.1.2/32 Direct 0 0 10.2.1.2 GE4/1/1
127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0
127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
200.1.1.0/24 Direct 0 0 200.1.1.1 InLoop0
200.1.1.1/32 Direct 0 0 127.0.0.1 InLoop0
Issue the display ip routing-table vpn-instance command on the PEs. You can see the route to the VPN
behind the peer CE. Take PE 2 as an example:
Routing Tables: vpn1
Destinations : 7 Routes : 7
Destination/Mask Proto Pre Cost NextHop Interface
10.1.1.0/24 BGP 255 0 1.1.1.9 NULL0
10.1.1.1/32 BGP 255 0 1.1.1.9 NULL0
10.2.1.0/24 Direct 0 0 10.2.1.2 GE4/1/1
10.2.1.1/32 Direct 0 0 10.2.1.1 GE4/1/1
10.2.1.2/32 Direct 0 0 127.0.0.1 InLoop0
100.1.1.1/32 BGP 255 0 1.1.1.9 NULL0
200.1.1.1/32 BGP 255 0 10.2.1.1 GE4/1/1