联邦

bgp联邦3要素

1.联邦中所有路由器都必须使用小as号(router bgp 小as)

2.联邦中所有路由器都必须声明大as号(bgp confederation identifier 大as)

3.连接小as的边界路由器必须互相指peer(bgp confrederation peers对方小as）

联邦实验：

r1:

router bgp 64512

no au

no syn

bgp router-id 1.1.1.1

neighbor 12.1.1.2 remote-as 2

neighbor 3.3.3.3 remote-as 64512

neighbor 3.3.3.3 up lo0

neighbor 3.3.3.3 next-hop-self

r3:

router bgp 64512

no au

no syn

bgp router-id 3.3.3.3

neighbor 1.1.1.1 remote-as 634512

neighbor 1.1.1.1 update-souce lo0

neighbor 4.4.4.4 remote-as 64513

neighbor 4.4.4.4 up lo0

neighbor 4.4.4.4 ebgp-multihop

r4:

router bgp 64513

bgp router-id 4.4.4.4

no au

no syn

neighbor 3.3.3.3 remote-as 64512

neighbor 3.3.3.3 up lo0

neighbor 3.3.3.3 ebgp-multihop

r1:

bgp confederation identifier 134(声明大as号)

r3:

bgp confederation identifier 134

r4:

bgp confederation identifier 134

network 4.4.4.0 mask 255.255.255.0

bgp confederation peers 64512(互指peer)

r3:

bgp confederation peers 64513

bgp选路原则

1.权重

2.本地优先级

3.下一跳

4.as越短越好

5.起源属性

6.med

7.通过ebgp学到优于ibgp

8.通过igp邻居收到的值最小

9.不看

10.bgp邻居router id

常见bgp路由属性16种

0-weight(cisco)

1.origin*

2.as-path*(防环)

3.next hop*(最优)

4.med

5.local-preference

6.atomic-aggregate

7.aggregator

8.community

9.originator-id

10.cluster-list

11.destination pref(mci)

12.advertiser(baynet)

13.rcid-path(baynet)

14.mp_reach_nlri

15.mp_unreach_nlri

16.extended_communities