BGP 环回口建邻居.doc

BGP实验.使用环回口建立邻居R1配置router bgp 1no synchronizationbgp router-id 1.1.1.1bgp log-neighbor-changesnetwork 1.1.1.0 mask 255.255.255.0（宣告路由表中存在的路由条目）neighbor 12.1.1.2 remote-as 2（使用接口地址建立邻居）no auto-summaryR2配置router ospf 100router-id 2.2.2.2log-adjacency-changesnetwork 2.2.2.2 0.0.0.0 area 0network 23.1.1.1 0.0.0.0 area 0router bgp 2no synchronizationbgp router-id 2.2.2.2bgp log-neighbor-changesnetwork 2.2.2.0 mask 255.255.255.0neighbor 3.3.3.3 remote-as 2neighbor 3.3.3.3 update-source Loopback0（使用LO0地址建立邻居）neighbor 3.3.3.3 next-hop-selfneighbor 4.4.4.4 remote-as 2neighbor 4.4.4.4 update-source Loopback0neighbor 4.4.4.4 next-hop-selfneighbor 12.1.1.1 remote-as 1no auto-summaryR3配置router ospf 100router-id 3.3.3.3log-adjacency-changesnetwork 3.3.3.3 0.0.0.0 area 0network 23.1.1.2 0.0.0.0 area 0network 34.1.1.1 0.0.0.0 area 0router bgp 2no synchronizationbgp router-id 3.3.3.3bgp log-neighbor-changesnetwork 3.3.3.0 mask 255.255.255.0network 23.1.1.0 mask 255.255.255.0network 34.1.1.0 mask 255.255.255.0neighbor 2.2.2.2 remote-as 2neighbor 2.2.2.2 update-source Loopback0neighbor 4.4.4.4 remote-as 2neighbor 4.4.4.4 update-source Loopback0no auto-summaryR4配置router ospf 100router-id 4.4.4.4log-adjacency-changesnetwork 4.4.4.4 0.0.0.0 area 0network 34.1.1.2 0.0.0.0 area 0router bgp 2no synchronizationbgp router-id 4.4.4.4bgp log-neighbor-changesnetwork 4.4.4.0 mask 255.255.255.0neighbor 2.2.2.2 remote-as 2neighbor 2.2.2.2 update-source Loopback0neighbor 2.2.2.2 next-hop-selfneighbor 3.3.3.3 remote-as 2neighbor 3.3.3.3 update-source Loopback0neighbor 3.3.3.3 next-hop-selfneighbor 5.5.5.5 remote-as 3neighbor 5.5.5.5 ebgp-multihop 255neighbor 5.5.5.5 update-source Loopback0no auto-summaryip route 5.5.5.0 255.255.255.0 45.1.1.2（注意底层可达性）R5配置router bgp 3no synchronizationbgp router-id 5.5.5.5bgp log-neighbor-changesnetwork 5.5.5.0 mask 255.255.255.0neighbor 4.4.4.4 remote-as 2neighbor 4.4.4.4 ebgp-multihop 255（EBGP邻居多跳TTL默认为1，但是1条明显不可达所以我们的改动，配置默认为255，IBGP没有多跳）neighbor 4.4.4.4 update-source Loopback0no auto-summaryip route 4.4.4.0 255.255.255.0 45.1.1.1（注意底层可达性）注意：两个EBGP邻居使用一定要注意底层可达性 要是底层不可达路由器将邻居状态表示为active状态！BGP建立邻居注意：1：底层一定可达，底层的数据包不可达邻居建立不起来2：下一条可达3：BGP同步是否开启4：IBGP没有多跳 所以在建立IBGP邻居我们建议使用换回口 EBGP邻居建议使用直连接口(BGP)建立邻居neighbor通告路由network通告路由只要本地路由表中有的都可以通告进来1:指邻居2:设置更新源3:指静态路由到对端的换回没有标识(不优的路由):1:不放进路由表2:不会给其他BGP邻居传BGP路由优的条件:1:同步（