思科CCIE考试：配置BGP案例七

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Case 7
( E3 J; ]' ~, `2 Y+ D. p让路由器A选择路由器B为到达AS 300(网络180.10.0.0)的出口:
5 _/ ?, g- d% o" ^. w* V% `% ^路由器B配置如下:
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router bgp 400
) x4 V6 i$ W! l7 _' Z9 z. |0 Xneighbor 4.4.4.4 remote-as 100
neighbor 4.4.4.4 route-map Aiko out
& H( o8 O' F6 `) tneighbor 5.5.5.4 remote-as 300
; j6 ^( }) h* F. a0 nbgp always-compare-med
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route-map Aiko permit 10
* k- I6 }% o" v- t  fset metric 50
4 u% {; ?" t0 W4 I# q0 N' Q" P% \!
路由器C配置如下:
!
router bgp 300
. d* a  X: ^5 y0 Q- E$ H! Z7 H: wneighbor 2.2.2.2 remote-as 100
neighbor 2.2.2.2 route-map SETMEDOUT out
neighbor 5.5.5.5 remote-as 400
4 q0 B- p$ Y& l: Tneighbor 1.1.1.2 remote-as 300
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route-map Aiko permit 10
# F( K2 i0 ]- ?( p- L5 U" dset metric 120
1 L7 I7 l% b9 S9 I0 J: N!
路由器D配置如下:
: R4 G) N" f( C* r
4 Q5 R2 d% h* R!

会计考友

</p>router bgp 300
neighbor 3.3.3.2 remote-as 100
) ]$ o+ w% U' f7 Lneighbor 3.3.3.2 route map Aiko out
& b5 D9 ]  K( t, `, ?, J! eneighbor 1.1.1.1 remote-as 300
, O3 x1 Y9 Z' n8 Y+ ^2 U; S!
' m+ s2 v/ w, t3 ^7 eroute-map Aiko permit 10
6 q; V- A% w% R7 Y+ Vset metric 200
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" s% C3 [# G2 R' d. LMonitoring and Maintaining BGP Attributes
（CCIE复习指导）一些辅助性的调试命令:
1.显示BGP表信息:
1 z! |) ]7 R1 Y  q5 D* e0 u' GAiko#show ip bgp
2.显示BGP邻居信息:
" s4 m, W; ]- f- ~- }Aiko#show ip bgp neighbors [ip-address]
3.显示被惩罚的BGP路由信息:
Aiko#show ip bgp dampened-paths
5 a& L/ i: t/ I4.显示所有的BGP连接信息:
; E: k% d5 X% e  ~6 c7 b* uAiko#show ip bgp summary
5.清除BGP的路由惩罚:
1 Q5 _# ?% A( b, P; H3 `2 H1 XAiko#clear ip bgp dampening [ip-address mask]
! [5 A  ^9 ]8 z* bPt.4 Border Gateway Protocol Filtering
# H+ C9 t4 W' C% s$ \0 XPrefix Filtering
& v* }. v' Q) C2 K/ V- Z! V/ x一些使用ACL或前缀列表过滤BGP路由的方法:
7 I0 H3 n" C: h$ x1.基于邻居的使用分发列表过滤BGP路由:
Aiko(config-router)#neighbor {ip-address} distribute-list {ACL| prefix-list} {in|out}2.全局使用分布列表过滤进站的BGP路由:
Aiko(config-router)
#distribute-list {ACL|prefix prefix-list} in [interface]
& E7 |7 C% q0 w6 Q. ]3.调用前缀列表过滤BGP路由:
Aiko(config-router)#neighbor {ip-address} prefix-list {prefix-list} {in|out}