neighbor x.x.x.x next-hop-self一般在ibgp边界的路由器敲。
peer group
减少缓存
减少命令行
r1:
router bgp 123
bgp router-id 1.1.1.1
no auto
no syn
neighbor ibgp peer-group
neighbor ibgp remote-as 123
neighbor ibgp update-souce loopback 0
neighbor 2.2.2.2 peer-group ibgp
neighbor 3.3.3.3 peer-group ibgp
r2:
neighbro 1.1.1.1 remote-as 123
neighbor 1.1.1.1 up lo0
neighbor 1.1.1.1 next-hop-self
r3:
router bgp 123
neighbor 1.1.1.1 remote-as 123
neighbor 1.1.1.1 up lo0
neighbor 1.1.1.1 next-hop-self
同步开启的规则。
从ibgp学到的一条bgp路由，不会放进路由表或者不会通告给ebgp邻居，除非这条路由也能从igp学到，
