Use the network command to configure a router with the prefixes that originate within its AS. Thereafter the router advertises these configured prefixes with the origin attribute set to IGP. See Understanding the Origin Attribute for more information about origins. Figure 13 shows a network structure of three autonomous systems, each with a router that originates certain prefixes.
Figure 13: Prefixes Originating in an AS
The following commands configure router NY:
- host1(config)#router bgp 300
- host1(config-router)#neighbor 10.2.25.1 remote-as
100
- host1(config-router)#neighbor 10.4.4.1 remote-as
400
- host1(config-router)#network 192.168.33.0
mask 255.255.255.0
The following commands configure router Boston:
- host2(config)#router bgp 100
- host2(config-router)#neighbor 10.2.25.2 remote-as
300
- host2(config-router)#neighbor 10.3.3.1 remote-as
400
- host2(config-router)#network 172.19.0.0
Notice that a mask was not specified for the prefix originating with router Boston. The natural mask is assumed for networks without a mask.
The following commands configure router LA:
- host3(config)#router bgp 400
- host3(config-router)#neighbor 10.3.3.2 remote-as
100
- host3(config-router)#neighbor 10.4.4.2 remote-as
300
- host3(config-router)#network 172.28.8.0 mask
255.255.248.0
network
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