BGP对等组 peer-group

BGP对等组： 当同样的路由策略应用于多个BGP对端的时候，将对端指定为一个对等组的成员将会极大地简化一个路由器的BGP配置。可以按照下面步骤来生成一个对等组： 1）为对等组指定一个名字   neighbor xiaomu peer-group  2）如果是内部对等组，就要先为对等组指定AS号（neighbor xiaomu remote-as 100 ）；     如果是外部对等组，每个EBGP都要单独指定。     neighbor x.x.x.x remote-as 200 3）将成员加入对等组中:  neighbor 2.2.2.2 peer-group xiaomu 4) 如果是内部对等组，要指定loopback , next-hop-self      neighbor xiaomu update-source Loopback0      neighbor xiaomu next-hop-self 5）对对等组应用策略：neighbor xiaomu filter-list 1 in     内部对等组的配置： R1： router bgp 100  no synchronization  bgp log-neighbor-changes  network 1.1.1.0 mask 255.255.255.0  neighbor xiaomu peer-group             //为对等体组指定一个名字  neighbor xiaomu remote-as 100        //必须先指定内部对等组的AS号  neighbor xiaomu update-source Loopback0   neighbor 2.2.2.2 peer-group xiaomu        //将对等组的成员加入对等组中  neighbor 3.3.3.3 peer-group xiaomu  no auto-summary R2： !         router bgp 100  no synchronization  bgp router-id 2.2.2.2  bgp log-neighbor-changes  network 2.2.2.0 mask 255.255.255.0  neighbor xiaomu peer-group  neighbor xiaomu remote-as 100  neighbor xiaomu update-source Loopback0  neighbor xiaomu next-hop-self  neighbor 1.1.1.1 peer-group xiaomu  neighbor 3.3.3.3 peer-group xiaomu  neighbor 172.16.4.4 remote-as 200  no auto-summary R3： !         router bgp 100  no synchronization  bgp router-id 3.3.3.3  bgp log-neighbor-changes  network 3.3.3.0 mask 255.255.255.0  neighbor xiaomu peer-group  neighbor xiaomu remote-as 100  neighbor xiaomu update-source Loopback0  neighbor xiaomu next-hop-self  neighbor 1.1.1.1 peer-group xiaomu  neighbor 2.2.2.2 peer-group xiaomu  neighbor 172.16.5.5 remote-as 200  no auto-summary 外部对等组的配置： R2： ! router bgp 100  no synchronization  bgp router-id 2.2.2.2  bgp log-neighbor-changes  network 2.2.2.0 mask 255.255.255.0  neighbor xiaomu peer-group  neighbor xiaomu remote-as 100  neighbor xiaomu update-source Loopback0  neighbor xiaomu next-hop-self  neighbor out-xiaomu peer-group                 //定义一个对等组名  neighbor 1.1.1.1 peer-group xiaomu  neighbor 3.3.3.3 peer-group xiaomu  neighbor 172.16.4.4 remote-as 200    //单独指定外部对等组成员的AS号  neighbor 172.16.4.4 peer-group out-xiaomu     //将成员加入对等组中  no auto-summary R3： !         router bgp 100  no synchronization  bgp router-id 3.3.3.3  bgp log-neighbor-changes  network 3.3.3.0 mask 255.255.255.0  neighbor xiaomu peer-group  neighbor xiaomu remote-as 100  neighbor xiaomu update-source Loopback0  neighbor xiaomu next-hop-self  neighbor out-xiaomu peer-group                            neighbor 1.1.1.1 peer-group xiaomu  neighbor 2.2.2.2 peer-group xiaomu  neighbor 172.16.5.5 remote-as 200  neighbor 172.16.5.5 peer-group out-xiaomu  no auto-summary   测试： R2#show ip bgp peer-group BGP peer-group is xiaomu,  remote AS 100   BGP version 4   Default minimum time between advertisement runs is 5 seconds  For address family: IPv4 Unicast   BGP neighbor is xiaomu, peer-group internal, members:   1.1.1.1 3.3.3.3   Index 1, Offset 0, Mask 0x2   NEXT_HOP is always this router   Update messages formatted 17, replicated 5   Number of NLRIs in the update sent: max 0, min 0           BGP peer-group is out-xiaomu   BGP version 4   Default minimum time between advertisement runs is 30 seconds  For address family: IPv4 Unicast   BGP neighbor is out-xiaomu, peer-group external, members:   172.16.4.4   Index 2, Offset 0, Mask 0x4   Update messages formatted 5, replicated 0   Number of NLRIs in the update sent: max 0, min 0