50、BGP配置实验之社团属性community

1、社团属性community解析

企业建站必须是能够以充分展现企业形象为主要目的，是企业文化与产品对外扩展宣传的重要窗口，一个合格的网站不仅仅能为公司带来巨大的互联网上的收集和信息发布平台，成都创新互联公司面向各种领域：混凝土搅拌罐车等网站设计、营销型网站建设解决方案、网站设计等建站排名服务。

BGP社团属性community：

可开启：BGP社团属性community为可选属性，默认不识别。可通过命令开启：neighbor x.x.x.x send-community

传递性：BGP社团属性community只在邻居有效，邻居的邻居不再有效，想要传递到邻居的邻居需配置neighbor x.x.x.x send-community

修改BGP社团属性community步骤：

ip prefix-list 1 permit 1.1.1.0/24

route-map COM permit 10

 match ip address prefix-list 1

 set community no-advertise 不传给BGP邻居

 set community no-export不传出大AS

 set community local-AS 不传出小AS

route-map COM permit 20

router bgp 1

 neighbor 12.1.1.2 send-community

 neighbor 12.1.1.2 route-map COM out

2、实验拓扑

3、基础配置

R1配置

interface Loopback0

 ip address 1.1.1.1 255.255.255.0

interface Serial0/0

 ip address 12.1.1.1 255.255.255.0

router bgp 1

 no synchronization

 bgp router-id 1.1.1.1

 network 1.1.1.0 mask 255.255.255.0

 neighbor 12.1.1.2 remote-as 2

 neighbor 12.1.1.2 send-community

 no auto-summary

R2配置

interface Loopback0

 ip address 2.2.2.2 255.255.255.0

interface Serial0/0

 ip address 12.1.1.2 255.255.255.0

interface Serial0/1

 ip address 23.1.1.2 255.255.255.0

router ospf 110

 router-id 2.2.2.2

 network 2.2.2.0 0.0.0.255 area 0

 network 23.1.1.0 0.0.0.255 area 0

router bgp 64512

 no synchronization

 bgp router-id 2.2.2.2

 bgp confederation identifier 2

 neighbor 3.3.3.3 remote-as 64512

 neighbor 3.3.3.3 update-source Loopback0

 neighbor 3.3.3.3 next-hop-self

 neighbor 12.1.1.1 remote-as 1

 neighbor 3.3.3.3 send-community

 no auto-summary

R3配置

interface Loopback0

 ip address 3.3.3.3 255.255.255.0

interface Serial0/0

 ip address 34.1.1.3 255.255.255.0

interface Serial0/1

 ip address 23.1.1.3 255.255.255.0

router ospf 110

 router-id 3.3.3.3

 network 3.3.3.0 0.0.0.255 area 0

 network 23.1.1.0 0.0.0.255 area 0

 network 34.1.1.0 0.0.0.255 area 0

router bgp 64512

 no synchronization

 bgp router-id 3.3.3.3

 bgp confederation identifier 2

 bgp confederation peers 64513 

 neighbor 2.2.2.2 remote-as 64512

 neighbor 2.2.2.2 update-source Loopback0

 neighbor 4.4.4.4 remote-as 64513

 neighbor 4.4.4.4 ebgp-multihop 255

 neighbor 4.4.4.4 update-source Loopback0

 neighbor 4.4.4.4 send-community 

 no auto-summary

R4配置

interface Loopback0

 ip address 4.4.4.4 255.255.255.0

interface Serial0/0

 ip address 34.1.1.4 255.255.255.0

interface Serial0/1

 ip address 45.1.1.4 255.255.255.0

router ospf 110

 router-id 4.4.4.4

 network 4.4.4.0 0.0.0.255 area 0

 network 34.1.1.0 0.0.0.255 area 0

 network 45.1.1.0 0.0.0.255 area 0

router bgp 64513

 no synchronization

 bgp router-id 4.4.4.4

 bgp confederation identifier 2

 bgp confederation peers 64512 

 neighbor 3.3.3.3 remote-as 64512

 neighbor 3.3.3.3 ebgp-multihop 255

 neighbor 3.3.3.3 update-source Loopback0

 neighbor 5.5.5.5 remote-as 64513

 neighbor 5.5.5.5 update-source Loopback0

 neighbor 5.5.5.5 send-community 

 no auto-summary

R5配置

interface Loopback0

 ip address 5.5.5.5 255.255.255.0

interface Serial0/0

 ip address 56.1.1.5 255.255.255.0

interface Serial0/1

 ip address 45.1.1.5 255.255.255.0

router ospf 110

 router-id 5.5.5.5

 network 5.5.5.0 0.0.0.255 area 0

 network 45.1.1.0 0.0.0.255 area 0

router bgp 64513

 no synchronization

 bgp router-id 5.5.5.5

 bgp confederation identifier 2

 neighbor 4.4.4.4 remote-as 64513

 neighbor 4.4.4.4 update-source Loopback0

 neighbor 56.1.1.6 remote-as 6

 neighbor 56.1.1.6 send-community 

 no auto-summary

R6配置

interface Loopback0

 ip address 6.6.6.6 255.255.255.0

interface Serial0/0

 ip address 56.1.1.6 255.255.255.0

router bgp 6

 no synchronization

 bgp router-id 6.6.6.6

 neighbor 56.1.1.5 remote-as 2

 no auto-summary

4、社团属性验证

ip prefix-list 1 seq 5 permit 1.1.1.0/24

route-map COM permit 10

 match ip address prefix-list 1

 set community no-advertise

route-map COM permit 20

router bgp 1

 neighbor 12.1.1.2 send-community

 neighbor 12.1.1.2 route-map COM out

ip prefix-list 1 seq 5 permit 1.1.1.0/24

route-map COM permit 10

 match ip address prefix-list 1

 set community no-export

route-map COM permit 20

router bgp 1

 neighbor 12.1.1.2 send-community

 neighbor 12.1.1.2 route-map COM out

ip prefix-list 1 seq 5 permit 1.1.1.0/24

route-map COM permit 10

 match ip address prefix-list 1

 set community local-AS

route-map COM permit 20

router bgp 1

 neighbor 12.1.1.2 send-community

 neighbor 12.1.1.2 route-map COM out