Figure 96: Network with Potential Routing Loops
The following commands are relevant to the illustrated network:
host1:pe1(config)#ip vrf yourvpn
host1:pe1(config-vrf)#rd 200:1
host1:pe1(config-vrf)#route-target both 200:11
...
host1:pe1(config)#router bgp 200
host1:pe1(config-router)#address-family ipv4 unicast vrf yourvpn
host1:pe1(config-router)#neighbor 10.5.4.22 remote-as 100
host1:pe1(config-router)#neighbor 10.5.4.22 as-override
...
Now, suppose instead you assign a unique site of origin to each CE router in the
network and configure the BGP session on each PE router with the site of origin. The
result of the following (partial) configuration is shown in Figure 97 on page 450.
host1:pe1(config)#ip vrf yourvpn
host1:pe1(config-vrf)#rd 200:1
host1:pe1(config-vrf)#route-target both 200:11
...
host1:pe1(config)#router bgp 200
host1:pe1(config-router)#address-family ipv4 unicast vrf yourvpn
host1:pe1(config-router)#neighbor 10.5.4.22 remote-as 100
host1:pe1(config-router)#neighbor 10.5.4.22 as-override
host1:pe1(config-router)#neighbor 10.5.4.22 site-of-origin 200:21
...
Configuring BGP VPN Services â– 449
Chapter 5: Configuring BGP-MPLS Applications
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