3Com 3C13636 Configuration Manual page 887

3Com Router 3000 Ethernet Family
Configuration Guide
Note that BGP adjacency is established through loopback interface and the sub-net
mask must be 32 bits.
Step 3: Permit BGP session over any operable TCP interface.
In general, BGP uses the best local address in TCP connection. To keep TCP
connection available even when the interface involved fails, you can permit BGP
session over any interface through which TCP connection can be set up.
Table 3-15 Permit BGP session over any operable TCP interface
Permit BGP session over any operable
TCP interface
Use the best local address for TCP
connection
BGP often uses the specified loopback interface to set up BGP adjacency with the peer.
This can reduce the impact of network flap, because loopback interfaces are always up.
2) Configure MP-IBGP
Step: Enter MP-IBGP address family view.
Perform the following configurations in BGP view.
Table 3-16 Configure VPNv4 address family view
Enter MBGP VPNv4 view
Exit MBGP VPNv4 view
Step 2: Configure MBGP neighbor
Configure MBGP internal neighbor in MBGP VPNv4 view.
Step 3: Activate peer (group)
By default, BGP neighbor is active while MBGP neighbor is inactive. You should
activate MBGP neighbor in VPNv4 view.
Step 4: Configure local address as next hop in route advertisement (optional)
It is not configured by default. When configuring in multi-AS VPN Option B mode, you
must configure the IBGP peers in each involved domain with this command.
Operation
Operation
3Com Corporation
3-25
Chapter 3 BGP/MPLS VPN Configuration
Command
peer { peer-address | group-name }
connect-interface
interface-number
undo peer {
group-name } connect-interface
interface-type interface-number
Command
ipv4-family vpnv4 [ unicast ]
undo ipv4-family vpnv4 [ unicast ]
interface-type
peer-address |