BGP 环回口建邻居

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1、BGP实验.使用环回口建立邻居  R1配置routerbgp1 nosynchronization bgprouter-id1.1.1.1 bgplog-neighbor-changes network1.1.1.0mask255.255.255.0（宣告路由表中存在的路由条目） neighbor12.1.1.2remote-as2（使用接口地址建立邻居） noauto-summaryR2配置routerospf100 router-id2.2.2.2 log-adjacency-changes network2.2.

2、2.20.0.0.0area0 network23.1.1.10.0.0.0area0routerbgp2 nosynchronization bgprouter-id2.2.2.2 bgplog-neighbor-changes network2.2.2.0mask255.255.255.0 neighbor3.3.3.3remote-as2 neighbor3.3.3.3update-sourceLoopback0（使用LO0地址建立邻居） neighbor3.3.3.3next-hop-self neighbor

3、4.4.4.4remote-as2 neighbor4.4.4.4update-sourceLoopback0 neighbor4.4.4.4next-hop-self neighbor12.1.1.1remote-as1 noauto-summary R3配置routerospf100 router-id3.3.3.3 log-adjacency-changes network3.3.3.30.0.0.0area0 network23.1.1.20.0.0.0area0 network34.1.1.10.0.0.0a

4、rea0routerbgp2 nosynchronization bgprouter-id3.3.3.3 bgplog-neighbor-changes network3.3.3.0mask255.255.255.0 network23.1.1.0mask255.255.255.0 network34.1.1.0mask255.255.255.0 neighbor2.2.2.2remote-as2 neighbor2.2.2.2update-sourceLoopback0 neighbor4.4.4.4remote-a

5、s2 neighbor4.4.4.4update-sourceLoopback0 noauto-summaryR4配置routerospf100 router-id4.4.4.4 log-adjacency-changes network4.4.4.40.0.0.0area0 network34.1.1.20.0.0.0area0routerbgp2 nosynchronization bgprouter-id4.4.4.4 bgplog-neighbor-changes network4.4.4.0mask255.2

6、55.255.0 neighbor2.2.2.2remote-as2 neighbor2.2.2.2update-sourceLoopback0 neighbor2.2.2.2next-hop-self neighbor3.3.3.3remote-as2 neighbor3.3.3.3update-sourceLoopback0 neighbor3.3.3.3next-hop-self neighbor5.5.5.5remote-as3 neighbor5.5.5.5ebgp-multihop255 neighbor5

7、.5.5.5update-sourceLoopback0 noauto-summaryiproute5.5.5.0255.255.255.045.1.1.2（注意底层可达性） R5配置routerbgp3 nosynchronization bgprouter-id5.5.5.5 bgplog-neighbor-changes network5.5.5.0mask255.255.255.0 neighbor4.4.4.4remote-as2 neighbor4.4.4.4ebgp-multihop255（EBGP邻居多

8、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） neighbor4.4.4.4update-sourceLoopback0 noauto-summaryiproute4.4.4.0255.255.255.045.1.1.1（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