cisco学习笔记

      CCIE之路中。。。。其实我是一个天才,可惜天妒英才!o(∩_∩)o...哈哈

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拓扑:

 

1.     no-export属性

当一台路由器,收到一个bgp的路由带有no-export属性是这台路由器就不会再向EBGP对等体发送该路由了

 

R1

Router>en

Router#conf t

Router(config)#host R1

R1(config)#no ip do lo

R1(config)#line cons 0

R1(config-line)#no exec-t

R1(config-line)#logg sync

R1(config-line)#exi

R1(config)#int s1/1

R1(config-if)#ip add 10.1.1.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)#int lo 0

R1(config-if)#ip add 172.16.1.1 255.255.255.0

R1(config-if)#ip add 172.16.2.1 255.255.255.0 s

R1(config-if)#ip add 172.16.3.1 255.255.255.0 s

R1(config-if)#router bgp 1

R1(config-router)#net 172.16.1.0 mask 255.255.255.0

R1(config-router)#net 172.16.2.0 mask 255.255.255.0

R1(config-router)#net 172.16.3.0 mask 255.255.255.0

R1(config-router)#nei 10.1.1.2 remote 2

R1(config-router)#end

 

没配置NO-EXPORT时,R3仍学到所有路由

R3#sh ip bgp

BGP table version is 6, local router ID is 10.2.2.2

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

              r RIB-failure, S Stale

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

 

   Network          Next Hop            Metric LocPrf Weight Path

*> 10.1.1.0/24      10.2.2.1                 0             0 2 i

*  10.2.2.0/24      10.2.2.1                 0             0 2 i

*>                  0.0.0.0                  0         32768 i

*> 172.16.1.0/24    10.2.2.1                               0 2 1 i

*> 172.16.2.0/24    10.2.2.1                               0 2 1 i

*> 172.16.3.0/24    10.2.2.1                               0 2 1 i

配置EX-EXPORT

R1(config)#access-list 1 per 172.16.3.0 0.0.0.255

R1(config)#route-map ccxx per 10

R1(config-route-map)#ma ip add 1

R1(config-route-map)#set community no-export

R1(config-route-map)#exi

R1(config)#route-map ccxx per 20 (写一个空条目)

R1(config-route-map)#exi

R1(config)#router bgp 1

R1(config-router)#nei 10.1.1.2 route-map ccxx out

R1(config-router)#nei 10.1.1.2 send-community

配好后:

R1#cle ip bgp * so out

 

查看R2 R3路由表

R2#sh ip bgp

BGP table version is 5, local router ID is 10.2.2.1

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

              r RIB-failure, S Stale

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

 

   Network          Next Hop            Metric LocPrf Weight Path

*> 172.16.1.0/24    10.1.1.1                 0             0 1 i

*> 172.16.2.0/24    10.1.1.1                 0             0 1 i

*> 172.16.3.0/24    10.1.1.1                 0             0 1 i

R3#sh ip bgp

BGP table version is 5, local router ID is 10.2.2.2

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

              r RIB-failure, S Stale

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

 

   Network          Next Hop            Metric LocPrf Weight Path

*> 172.16.1.0/24    10.2.2.1                               0 2 1 i

*> 172.16.2.0/24    10.2.2.1                               0 2 1 i

 

R3没学到172.16.3.0 这一网络吧!!!!!)

R2#sh ip bgp 172.16.3.1

BGP routing table entry for 172.16.3.0/24, version 5

Paths: (1 available, best #1, table Default-IP-Routing-Table, not advertised to EBGP peer)

  Not advertised to any peer

  1

    10.1.1.1 from 10.1.1.1 (172.16.1.1)

      Origin IGP, metric 0, localpref 100, valid, external, best

      Community: no-export

 

posted on 2008-09-17 19:25 cisco交流平台 阅读(4704) 评论(0)  编辑 收藏 引用 所属分类: BGP
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