BGP团体属性（实验）

根据BGP路由的团体属性设置BGP路由策略

R1配置：

Loopback0 1.1.1.1

Loopback1 192.168.1.1/24

Loopback2 192.168.2.1/24

Loopback3 192.168.3.1/24

Loopback4 192.168.4.1/24

E1/0 10.1.12.1

R2配置：

Loopback 2.2.2.2

E1/0 10.1.12.2

配置IGP（RIP）保持连通性：

R1配置：

router rip

 version 2

 network 1.0.0.0

 network 10.0.0.0

 network 192.168.1.0

 network 192.168.2.0

 network 192.168.3.0

 network 192.168.4.0

 no auto-summary

R2配置：

router rip

 version 2

 network 2.0.0.0

 network 10.0.0.0

 no auto-summary

开始配置BGP(EBGP)：

R1

router bgp 109

 bgp router-id 1.1.1.1

 bgp log-neighbor-changes

 network 1.1.1.1 mask 255.255.255.255

 network 10.1.12.0 mask 255.255.255.0

 network 192.168.1.0

 network 192.168.2.0

 network 192.168.3.0

 network 192.168.4.0

 neighbor 10.1.12.2 remote-as 110

R2

router bgp 110

 bgp router-id 2.2.2.2

 bgp log-neighbor-changes

 network 1.1.1.1 mask 255.255.255.255

 network 10.1.12.0 mask 255.255.255.0

 neighbor 10.1.12.1 remote-as 109

 neighbor 10.1.12.1 route-map set_local_pref in

R2#sh ip bgp

BGP table version is 7, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path

 *>  1.1.1.1/32       10.1.12.1                1         32768 i

 *>  10.1.12.0/24     0.0.0.0                  0         32768 i

 *>  192.168.1.0      10.1.12.1                0    200      0 109 i

 *>  192.168.2.0      10.1.12.1                0    200      0 109 i

 *>  192.168.3.0      10.1.12.1                0    150      0 109 i

 *>  192.168.4.0      10.1.12.1                0    150      0 109 i

R1配置团体属性

第一步：开启路由器支持团体属性

ip bgp-community new-format

第二步，配置prefix-list列表

ip prefix-list 1 permit 192.168.1.0/24

ip prefix-list 1 permit 192.168.2.0/24

ip prefix-list 2 permit 192.168.3.0/24

ip prefix-list 2 permit 192.168.4.0/24

第三步，配置route-map set_community

route-map set_community permit 10

 match ip address prefix-list 1

 set community 109:1

route-map set_community permit 20

 match ip address prefix-list 2

 set community 109:2

第四步，在BGP当中调用

neighbor 10.1.12.2 send-community

neighbor 10.1.12.2 route-map set_community out

R2上配置route-map set_local_pref，对R1传递过来的带有团体属性的路由进行匹配，并附上特定的local-preference

第一步：开启路由器支持团体属性

ip bgp-community new-format

第二步：设置团体属性列表

ip prefix-list 1 seq 5 permit 192.168.2.0/24

ip prefix-list 1 seq 10 permit 192.168.4.0/24

第三步：

route-map set_local_pref permit 10

 match community 1

 set local-preference 200

route-map set_local_pref permit 20

 match community 2

 set local-preference 150

第四步：在BGP当中调用route-map set_local_pref

neighbor 10.1.12.1 route-map set_local_pref in

验证配置：

R2#sh ip bgp

BGP table version is 7, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path

 *>  1.1.1.1/32       10.1.12.1                1         32768 i

 *>  10.1.12.0/24     0.0.0.0                  0         32768 i

 *>  192.168.1.0      10.1.12.1                0    200      0 109 i

 *>  192.168.2.0      10.1.12.1                0    200      0 109 i

 *>  192.168.3.0      10.1.12.1                0    150      0 109 i

 *>  192.168.4.0      10.1.12.1                0    150      0 109 i

R2#sh ip bgp 192.168.1.0

BGP routing table entry for 192.168.1.0/24, version 2

Paths: (1 available, best #1, table default)

  Not advertised to any peer

  Refresh Epoch 1

  109

    10.1.12.1 from 10.1.12.1 (1.1.1.1)

      Origin IGP, metric 0, localpref 200, valid, external, best

      Community: 109:1

      rx pathid: 0, tx pathid: 0x0

从R1学来的团体属性为Community: 109:1的路由设置本地优先级为200.

R2#sh ip bgp 192.168.3.0

BGP routing table entry for 192.168.3.0/24, version 4

Paths: (1 available, best #1, table default)

  Not advertised to any peer

  Refresh Epoch 1

  109

    10.1.12.1 from 10.1.12.1 (1.1.1.1)

      Origin IGP, metric 0, localpref 150, valid, external, best

      Community: 109:2

      rx pathid: 0, tx pathid: 0x0

从R1学来的团体属性为Community: 109:2的路由设置本地优先级为150.

没有被匹配的路由还是以默认值传递。