【old】BGP redistribute connected

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設定

iosv-0(config)#router bgp 100
iosv-0(config-router)#neighbor 192.168.12.2 remote-as 200
iosv-0(config-router)#redistribute connected

iosv-1(config)#router bgp 200
iosv-1(config-router)#neighbor 192.168.12.1 remote-as 100
iosv-1(config-router)#redistribute connected

show ip route

iosv-0#sh ip ro | b Gate
Gateway of last resort is not set

  1.0.0.0/32 is subnetted, 1 subnets

C        1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
B        2.2.2.2 [20/0] via 192.168.12.2, 00:02:53
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.12.0/24 is directly connected, GigabitEthernet0/0
L        192.168.12.1/32 is directly connected, GigabitEthernet0/0

iosv-1#sh ip ro | b Gate
Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
B        1.1.1.1 [20/0] via 192.168.12.1, 00:04:59
      2.0.0.0/32 is subnetted, 1 subnets
C        2.2.2.2 is directly connected, Loopback0
      192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.12.0/24 is directly connected, GigabitEthernet0/0
L        192.168.12.2/32 is directly connected, GigabitEthernet0/0

network mask を使わなくてもloopbackの情報をBGPとして広告できる。言われてみればそらそうだけど、結構目からうろこだったので備忘録。

1.2 Routing concepts