BGP聚合
作者：互联网
BGP聚合实验
如下拓扑：
基本配置
# AR2基础配置
sysname AR2
#
interface GigabitEthernet0/0/0
ip address 12.1.1.2 255.255.255.0
#
interface LoopBack0
ip address 2.2.2.1 255.255.255.255
#
interface LoopBack1
ip address 2.2.2.2 255.255.255.255
#
interface LoopBack2
ip address 2.2.2.3 255.255.255.255
# AR1基础配置
sysname AR1
#
interface GigabitEthernet0/0/0
ip address 12.1.1.1 255.255.255.0
配置BGP
[AR1] bgp 100
[AR1-bgp]peer 12.1.1.2 as-number 100
[AR2]bgp 100
[AR2-bgp]peer 12.1.1.1 as-number 100
查看BGP邻居状态display bgp peer
发布环回口
[AR2-bgp]net 2.2.2.1 32
[AR2-bgp]net 2.2.2.2 32
[AR2-bgp]net 2.2.2.3 32
查看BGP路由表display bgp routing-table
在R1查看路由表是否有2.2.2.1/2/3的明细路由
自动聚合
取消network的路由，BGP引入直连路由
[AR2-bgp]undo net 2.2.2.1 32
[AR2-bgp]undo net 2.2.2.2 32
[AR2-bgp]undo net 2.2.2.3 32
[AR2-bgp]import-route direct //引入直连路由
[AR2-bgp]summary automatic //自动聚合
自动聚合对network的路由没有用，只对引入的路由有效
在R1上查看BGP路由表，是否有聚合的2.0.0.0路由
手动聚合
使用network获得环回口的路由
[AR2-bgp]undo import-route direct
[AR2-bgp]net 2.2.2.1 32
[AR2-bgp]net 2.2.2.2 32
[AR2-bgp]net 2.2.2.3 32
配置路由策略
[AR2]route-policy 1 permit node 1
[AR2-route-policy]apply as-path 100 200 11 additive
[AR2-route-policy]apply local-preference 20
[AR2-route-policy]apply cost 30
[AR2-route-policy]apply community 100:1
[AR2-route-policy]apply origin egp 1
[AR2-route-policy]apply preference 100
[AR2]route-policy 2 permit node 1
[AR2-route-policy]apply as-path 300 3 5 additive
[AR2-route-policy]apply local-preference 22
[AR2-route-policy]apply cost 40
[AR2-route-policy]apply community 100:2
[AR2-route-policy]apply origin incomplete
[AR2-route-policy]apply preference 33
[AR2]route-policy 3 permit node 1
[AR2-route-policy]apply as-path 33 55 additive
[AR2-route-policy]apply local-preference 89
[AR2-route-policy]apply cost 65
[AR2-route-policy]apply community 100:3
[AR2-route-policy]apply origin igp
[AR2-route-policy]apply preference 66
给发布的路由添加路由策略
[AR2]bgp 100
[AR2-bgp]network 2.2.2.1 32 route-policy 1
[AR2-bgp]network 2.2.2.2 32 route-policy 2
[AR2-bgp]network 2.2.2.3 32 route-policy 3
route-policy中的动作全部加入给路由后再发布
R1查看BGP路由表
添加Route-Policy前
添加Route-Policy后
配置聚合
[AR2]bgp 100
[AR2-bgp]aggregate 2.2.2.0 30 //聚合
[AR2-bgp]peer 12.1.1.1 advertise-community //通告团体属性，默认不通告
在R1查看BGP路由表，是否有聚合的路由
聚合后团体属性都没有了
通告团体属性后查看明细路由详细信息
通告团体属性后查看聚合路由详细信息
抑制明细
明细路由不传递
[AR2]bgp 100
[AR2-bgp]aggregate 2.2.2.0 30 detail-suppressed //抑制明细路由
在R1查看BGP路由表，不存在明细路由，只有聚合路由
继承明细AS-Path值
[AR2-bgp]aggregate 2.2.2.0 30 as-set //聚合路由继承明细路由的AS-Path值
在R1查看BGP路由表，聚合路由有了Path值，括号内的Path值无顺序
属性策略
给聚合路由添加属性
添加路由策略
[AR2]route-policy 4 permit node 1
[AR2-route-policy]apply cost 100
[AR2-route-policy]apply local-preference 10
[AR2-route-policy]apply origin egp 1
[AR2-route-policy]apply as-path 10 20 additive
添加属性策略
[AR2]bgp 100
[AR2-bgp]aggregate 2.2.2.0 32 attribute-policy 4
在R1查看BGP路由表，聚合路由会增加详细的属性
具体的属性在Route-Policy中调整
起源策略
给聚合设置条件
配置ACL
[AR2]acl 2000
[AR2-acl-basic-2000]rule permit source 2.2.2.1 0
添加Route-Policy
[AR2]route-policy 5 permit node 1
[AR2-route-policy]if-match acl 2000 //调用ACL 2000
修改起源属性
[AR2]bgp 100
[AR2-bgp]aggregate 2.2.2.0 30 origin-policy 5
在R1查看BGP路由表，汇聚路由Path从？变成了e
在R2上把2.2.2.1（LoopBack 0）删除
[AR2]int lo 0
[AR2-LoopBack0]undo ip ad
1
在R1查看BGP路由表，汇聚路由消失
当指定的路由不存在时，将不聚合
抑制策略
抑制某些明细不传递
[AR2-bgp]aggregate 2.2.2.0 30 detail-suppressed suppress-policy 5
1
抑制Route-Policy 5匹配到的2.2.2.1的路由，其他的明细不影响
在R1查看BGP路由表，没有2.2.2.1的明细路由
标签：bgp,AR2,聚合,route,BGP,policy,2.2,路由 来源： https://blog.csdn.net/sj349781478/article/details/119295779