先全运行bgp
R2
router bgp 2
no auto-summary
no synchronzation
bgp router-id 2.2.2.2
neighbor 12.1.1.1 remtotes as 10
neighbor 24.1.1.4 remote-as 10
r1：
router bgp 10
no auto-summary
no synchronization
bgp router-id 1.1.1.1
neighbor 12.1.1.2 remote-as 2
neighbor 3.3.3.3 remote-as 10
neighbor 3.3.3.3 update-source loop0
neighbor 3.3.3.3 next-hop-self r3
router bgp 10
no auto-summary
no synchronization
bgp router-id 3.3.3.3
neighbor 4.4.4.4remote-as 4
neighbor 4.4.4.4 update-source loopback 0
neighbor 1.1.1.1 remote-as 10
neighbor 1.1.1.1 update-source loopback 0
neighbor 35.1.1.5 remote-as 5
r4
router bgp 10
no auto-summary
no synchronization
bgp router-id 4.4.4.4
neighbor 24.1.1.1 remote-as 2
neighbor 3.3.3.3 remote-as 10
neighbor 3.3.3.3 update-source loopback 0
neighbor 3.3.3.3 next-hop-self
r5router bgp 5
no synchronization
no auto-summary
bgp router-id 5.5.5.5
neighbor 35.1.1.3 remote-as 10
igp的r1,r3,r4中运行，同属一个as10
r1
router eigrp 90
no auto-summary
eigrp router-id 1.1.1.1
network 13.1.1.1
network 1.1.1.1
r3
router eigrp 90
no auto-summary
eigrp rotuer-id 3.3.3.3
network 13.1.1.3
netwrok 34.1.1.1
netwrok 3.3.3.3
r4
router eigrp 90
no auto-summary
eigrp router-id 4.4.4.4
network 4.4.4.4
netwrok 34.1.1.4
在r2上通告 两条路由
int loo 8
ip add 8.8.8.8.8 255.255.255.0
router bgp 2
network 2.2.2.0 mask 255.255.255.0
netwrok 8.8.8.0 mask 255.255.255.0
优选了r1但我想现在优选r1 怎么选
r3
router bgp 10
neighbor 1.1.1.1 wight 1
’
但会针对该邻居给我发送的所有路由都改了。
访问2网络走r1 ,访问8网络走r4
r3
access-list 2 permit 2.2.2.0
route-map w permit 10
match ip address 2
set weight 1 route-map w permit 20
exit router bgp 10
neighbor 1.1.1.1 route-map w in
本地优先级
ip prefix-list 2 seq 10 permit 2.2.2.0/24
route-map LP permit 10
match ip address prefix-list 2
set local-preference 101
exitroute-map LP permit 20
exit router bgp 10
neighbor 12.1.1.2 route-map LP in修改as path
access-list 102 permit ip host 2.2.2.0 host 255.255.255.0
route-map AP permit 10
match ip address 102
set as-path prend 2 2 2
exit route-map AP permit 20
exit router bgp 2
neighbor 24.1.1.4 route-map AP out 修改起源属性
R4
ip prefix-list 2 seq 10 permit 2.2.2.0/24
route-map O permit 10
match ip address prefix-list 2
set origin egp 10 exitroute-map O permit 20
exit router bgp 10
neighbor 3.3.3.3 route-map o out 修改MED r2通过r4来访问r3
r3
int loo 9
ip add 9.9.9.9 255.255.255.0
router bg p10
netwrok 9.9.9.0 mask 255.255.255.0
r1 ip prefix-list 9 seq 10 permit 9.9.9.0/24
route-map MED permit 10
match ip address prefix-list 9
set metric 10
exit route-map MED permit 20
exitneighbor 12.1.1.2 route-map MED
