6.3用Community filter 控制路由

图片[1]-6.3用Community filter 控制路由-大赛人网
图6-3 用Community filter 控制路由网络拓扑

1.R1配置BGP

[R1]bgp 100
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 12.1.1.2 as-number 200

2.R2配置BGP

[R2]bgp 200
[R2-bgp]router-id 2.2.2.2
[R2-bgp]peer 12.1.1.1 as-number 100
[R2-bgp]peer 23.1.1.3 as-number 300

3.R3配置BGP

[R3]bgp 300
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 23.1.1.2 as-number 200 

4.R1宣告两条带community值路由

[R1]interface LoopBack 1
[R1-LoopBack1]ip address 1.1.2.1 32
[R1-LoopBack1]quit
[R1]interface LoopBack 2 
[R1-LoopBack2]ip address 1.1.3.1 32
[R1-LoopBack2]quit
[R1]route-policy 100:1 permit node 10
[R1-route-policy]apply community 100:1
[R1]route-policy 100:2 permit node 10
[R1-route-policy]apply community 100:2
[R1]bgp 100
[R1-bgp]network 1.1.2.1 32 route-policy 100:1
[R1-bgp]network 1.1.3.1 32 route-policy 100:2 

5.R1查看BGP路由

[R1]display bgp routing-table community
 *>   1.1.2.1/32         0.0.0.0         0                     0      <100:1>
 *>   1.1.3.1/32         0.0.0.0         0                     0      <100:2>

6.R1配置通告community参数命令,R2查看带community属性BGP路由(否则看不到community属性)

<R2>display bgp routing-table community
 Total Number of Routes: 0
[R1]bgp 100
[R1-bgp]peer 12.1.1.2 advertise-community
<R2>refresh bgp all import 
<R2>display bgp routing-table community

 *>   1.1.2.1/32         12.1.1.1        0                     0      <100:1>
 *>   1.1.3.1/32         12.1.1.1        0                     0      <100:2>

7.查看带community属性值路由

<R2>display bgp routing-table community 100:2
*>   1.1.3.1/32         12.1.1.1        0                     0      <100:2>

8.R2通过策略控制路由

[R2]ip community-filter 1 permit 100:1
[R2]route-policy COMM permit node 10
[R2-route-policy]if-match community-filter 1
[R2]bgp 200
[R2-bgp]peer 12.1.1.1 route-policy COMM import 
[R2-bgp]quit
[R2]quit
<R2>refresh bgp all import 
<R2>display bgp routing-table 
 *>   1.1.2.1/32         12.1.1.1        0                     0      100i

8.R2策略路由打上新的团体属性

[R2]route-policy COMM permit node 10
[R2-route-policy]apply community 200:1 additive 
[R2-route-policy]quit
[R2]quit
<R2>refresh bgp all import
<R2>display bgp routing-table community
 *>   1.1.2.1/32         12.1.1.1        0                     0      <100:1>, <200:1>

9.R2把新的团体属性传递给R3,R3查看BGP路由community属性

[R2]bgp 200
[R2-bgp]peer 23.1.1.3 advertise-community
<R3>refresh bgp all import
<R3>display bgp routing-table community
 *>   1.1.2.1/32         23.1.1.2                              0      <100:1>, <200:1>
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