■BGPの基本設定
R1で基本的なBGPの設定を説明します。
①BGPプロセスを設定する。
R1（config）#rotuer bgp [AS番号]
②BGPを貼るネイバーを設定する
R1(config-router)#neighbor [ピアを張るルータのIP] remote-as [AS番号]
③通知する経路を設定する
R1(config-router)#network [ネットワークIP] mask [サブネットマスク]
①②③の結果は以下となります。
R1(config)#rotuer bgp 1
R1(config-router)#neighbor 192.168.0.2 remote-as 2
R1(config-router)#network 10.10.10.0 mask 255.255.255.0
| R1のコンフィグ設定 | R2のコンフィグ設定 |
| interface Ethernet1/0 ip address 192.168.0.1 255.255.255.0 duplex full ! interface Ethernet1/1 ip address 10.10.10.1 255.255.255.0 duplex full ! router bgp 1 bgp log-neighbor-changes network 10.10.10.0 mask 255.255.255.0 neighbor 192.168.0.2 remote-as 2 | interface Ethernet1/0 ip address 192.168.0.2 255.255.255.0 duplex full ! interface Ethernet1/1 ip address 20.20.20.1 255.255.255.0 duplex full ! router bgp 2 bgp log-neighbor-changes network 20.20.20.0 mask 255.255.255.0 neighbor 192.168.0.1 remote-as 1 |
| R1の経路情報 | R2の経路情報 |
| R1#show ip route <中略> Gateway of last resort is not set 10.0.0.0/8 is variably subnetted, 2 subnets, 2 masksC 10.10.10.0/24 is directly connected, Ethernet1/1 L 10.10.10.1/32 is directly connected, Ethernet1/1 20.0.0.0/24 is subnetted, 1 subnets B 20.20.20.0 [20/0] via 192.168.0.2, 01:25:04 192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.0.0/24 is directly connected, Ethernet1/0 L 192.168.0.1/32 is directly connected, Ethernet1/0 | R2#show ip route <中略> Gateway of last resort is not set 10.0.0.0/24 is subnetted, 1 subnetsB 10.10.10.0 [20/0] via 192.168.0.1, 01:25:57 20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C 20.20.20.0/24 is directly connected, Ethernet1/1 L 20.20.20.1/32 is directly connected, Ethernet1/1 192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.0.0/24 is directly connected, Ethernet1/0 L 192.168.0.2/32 is directly connected, Ethernet1/0 |
■ベストパスの確認
「*」はその経路情報が有効であることを示している。
「>」はベストパスであることを示している。
| R1のBGP状態 | R2のBGP状態 |
| R1#show ip bgp <中略> BGP table version is 3, local router ID is 10.10.10.1 Status codes: s suppressed, d damped, h history, * valid, > best, i – internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i – IGP, e – EGP, ? – incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path*> 10.10.10.0/24 0.0.0.0 0 32768 i *> 20.20.20.0/24 192.168.0.2 0 0 2 i | R2#show ip bgp <中略> BGP table version is 3, local router ID is 192.168.0.2 Status codes: s suppressed, d damped, h history, * valid, > best, i – internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i – IGP, e – EGP, ? – incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path*> 10.10.10.0/24 192.168.0.1 0 0 1 i *> 20.20.20.0/24 0.0.0.0 0 32768 i |
■近接ルータの情報確認
| R1のBGP状態 |
| R1#show ip bgp summary <中略> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 192.168.0.2 4 2 318 320 5 0 0 04:45:18 1 |
| R2のBGP状態 |
| R2#show ip bgp summary <中略> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 192.168.0.1 4 1 976 972 5 0 0 14:43:15 1 |