首先对于ibg而言修改度值值 抓 抓 到之后 修改度量值
bgp会跟route-map一起出现
选路原则
路由有被加入路由表的资格,才能比。
思科华为前8步一样:
- weight 思科私有 华为:优先级 只影响本地
默认始发:32768 非本地:0 - LP 本地优先级 公认属性 发送给ibgp邻居会携带local preference . 用它实现 从内到外 从哪个出口出。只会影响as内的 针对ebgp邻居做入方向修改,可
- route originate 始发优于穿越 更多用来环防
- as path 比长短 公认强制
- 起源属性 i>e>incomplete
- MED 继承igp的度量值 从外到内 哪个入口入
- e>ibgp
- 去往边界的度量值
- 要么都是聚合,要么不是可以配置负载均衡
- 早学到的优
- router id小的优
- cluster-list做了路由反射器才有
实验:
看拓扑 配地址
内网igp
r1
router eigrp 90
no auto-summary
eigrp router 1.1.1.1
netwrork 1.1.1.1
network 13.1.1.1
r3
router eigrp 90
no auto-summary
eigrp router 3.3.3.3
network 3.3.3.3
network 13.1.1.3
netwrok 34.1.1.3
r4
router eigrp 90
no auto-summary
eigrp router 4.4.4.4
network 4.4.4.4
netwrok 34.1.1.4
bgp
r2起bgp
router bgp 2
no auto-summary
no synchronization
bgp router-id 2.2.2.2
neighbor 12.1.1.1 remote-as 10
neighbor 24.1.1.4 remote-as 10
r1和r4建ebgp
router bgp 10
no auto-summary
no synchronization
bgp router-id
neighbor as 2
r1 ibgp
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
r4 ibgp
扫描二维码关注公众号,回复:
12933185 查看本文章
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
r3 ibgp
router bgp 10
no auto-summary
no synchronization
bgp router-id 3.3.3.3
neighbor 1.1.1.1 remote-as 10
neighbor 4.4.4.4 remote-as 10
neighbor 1.1.1.1 update-source loopback0
ebgp :
neighbor 35.1.1.5 remote-as 5
r5 ebgp
router bgp 5
no auto-summary
no synchronization
bgp router-id 5.5.5.5
neighbor 35.1.1.3 remote-as 10
实验:
先在r2上通告两条路由
int loo 8
ip add 8.8.8.8 255.255.255.0
router bgp 2
netwrok 8.8.8.0 mask 255.255.255.0
network 2.2.2.0 mask 255.255.255.0
修改权重
进程下
neighbor x.x.x.x weight
是针对所有路由
针对 某一条路由
r3
access-list 2 permit 2.2.2.0
route-map w permit 10
match ip address 2 //调用acl
set weight 1
exit
route-map w permit 20
exit
router bgp 10
neighbor 1.1.1.1 route-map w in
用lp实现
r1
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 101
exit
route-map lp permit 20
exit
router bgp 10
neighbor 12.1.1.2 route-map lp in
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
exit
route-map o permit 20
exit
router bgp 10
neighbor 3.3.3.3 route-map o out
end
med 修改
先创建环回口
r3
int loo 9
ip address 9.9.9.9 255.255.255.0
router bgp 10
network 9.9.9.0 mask 255.255.255.0
bgp bestpath med missing-as-worst 收到不带med的路由,给他设置一个默认最大值
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 o permit 20
exit
router bgp 10
neighbor 12.1.1.2 rouete-map med out