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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
