Cisco Network Academy. All rights reserved CCNP+ BSCI v3.0Configuring Route Summarization with BGPCisco Network Academy. All rights reserved.CCNP+ BSCI v3.0CIDR and Aggregate Addresses在BGP中路由可以在任意的一个自治系统或是路由器上被汇总 .BGP4是一个无类的路由协议.支持VLSM和最长匹配路由. Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0Network Boundary SummarizationBGP, RIPv1, RIPv2, IGRP,和EIGRP会在主类网络边 界执行自动的路由汇总.BGP, RIPv2和EIGRP可以手工的关闭自动汇总特性.IANA的CIDR强制从A类地址开始进行汇总.no auto-summaryRouter(config-router)#Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0BGP network Commandnetwork network-number mask network-maskRouter(config-router)#ip route prefix mask null0Router(config)#手工配置一条指向空接口的路由,此路由为具体路由的汇总网络.此路由类似于EIGRP的指向null0接口路由.通过本命令可以将指向NULL 0接口的路由注入到BGP路由协议中.Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0BGP Summarization Using the network Command and Static Route to Null 0Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0Configuring BGP for Aggregate Addressingaggregate-address ip-address mask summary-only as-setRouter(config-router)# 在BGP中创建聚合路由. 使用summary-only选项仅仅会通告汇总路由而不通告具体路由. 使用as-set选项可以保留被聚合路由的路径信息. 无需使用空接口的静态路由.BGP会自动产生空接口的路由.Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0BGP Summarization Using the aggregate- address CommandCisco Network Academy. All rights reserved.CCNP+ BSCI v3.0BGP Aggregationshow ip bgpNetwork 192.168.24.0/22 192.168.24.0 192.168.25.0 192.168.26.0 192.168.27.0* s s s sNext Hop 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0LocPrfWeight 32768 32768 32768 32768 32768 Path i i i i iMetric00000routerC# show ip bgpBGP table version is 28, local router ID is 172.16.2.1 Status codes: s = suppressed, * = valid, = best, and i = internal Origin codes : i = IGP, e = EGP, and ? = incompleteRouterC#Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0LAB 1 : BGP路由汇总AS 64512 AS 64513l0 172.16.1.1/24 172.16.2.1/24 172.16.3.1/24 172.16.4.1/24192.168.2.2/24 S1/0 S1/1 192.168.2.1/24R3R2R1S1/1 192.168.1.1/24192.168.1.2/24 S1/0ip route 172.16.0.0 255.255.0.0 null0 router bgp 64512network 172.16.0.0 mask 255.255.0.0Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0LAB 2 : BGP路由汇总AS 64512 AS 64513l0 172.16.1.1/24 172.16.2.1/24 172.16.3.1/24 172.16.4.1/24192.168.2.2/24 S1/0 S1/1 192.168.2.1/24R3R2R1S1/1 192.168.1.1/24192.168.1.2/24 S1/0router bgp 64512aggregate-address 172.16.0.0 255.255.0.0 summary-only as-setCisco Network Academy. All rights reserved.CCNP+ BSCI v3.0ENDCisco Network Academy. All rights reserved CCNP+ BSCI v3.0Configuring BGP Route FilteringCisco Network Academy. All rights reserved.CCNP+ BSCI v3.0实现BGP路由过滤的几种方法 distribute-list用于过滤由ACL定义的路由 route-map与distribute-list一样过滤ACL定义的路由 prefix-list 用于过滤由ip prefix-list定义的路由 filter-list用于过滤由ip as-path access-list定义的路由具体配置方法请查看Cisco Network Academy. All rights reserved.CCNP+ BSCI v3.0LAB 1 : 使用distribute-list过滤BGP路由131.130.0.1/24 131.130.1.1/24 131.130.2.1/24 131.130.3.1/24R1R3R2172.16.0.1/24 172.16.1.1/24 172.16.2.1/24 172.16.3.1/24192.168.1.1/24 S1/1S1/0 192.168.1.2/24192.168.2.2/24 S1/0S1/1 192.168.2.1/24AS 64512AS 64513131.130.0.0/24 131.130.1.0/24172.16.2.0/24 172.16.3.0/24access-list 1 deny 131.130.0.0 0.0.0.255 access-list 1 deny 131.130.1.0 0.0.0.255 access-list 1 permit any access-list 2 deny 172.16.2.0 0.0.0.255 access-list 2 deny 172.16.3.0 0.0.0.255 access-list 2 permit any ! router bgp 1neighbor 192.168.2.2 distribute-list 2 inneighbor 192.168.2.2 distribute-list 1 outCisco Network Academy. All rights reserved.CCNP+ BSCI v3.0LAB 2 : 使用route-map过滤BGP路由131.130.0.1/24 131.130.1.1/24 131.130.2.1/24 131.130.3.1/24R1R3R2172.16.0.1/24 172.16.1.1/24 172.16.2.1/24 172.16.3.1/24192.168.1.1/24 S1/1S1/0 192.168.1.2/24192.168.2.2/24 S1/0S1/1 192.168.2.1/24AS 64512AS 64513131.130.0.0/24 131.130.1.0/24172.16.2.0/24 172.16.3.0/24access-list 1 deny 131.130.0.0 0.0.0.255 access-list 1 deny 131.130.1.0 0.0.0.255 access-list 1 permit any access-list 2 deny 172.16.2.0 0.0.0.255 access-list 2 deny 172.16.3.0 0.0.0.255 access-list 2 permit any ! route-map from_as_64513 permit 10match ip address 2 ! route-map to_as_64513 permit 10match ip address 1 ! router bgp 1neighbor 192.168.2.2 route-map from_as_64513 inneighbor 192.168.2.2 route-map to_as_64513 outCisco Network Academy. All rights reserved.CCNP+ BSCI v3.0LAB 3 : 使用prefix-list过滤BGP路由一131.130.0.1/24 131.130.1.1/24 131.130.2.1/24 131.130.3.1/24R1R3R2172.16.0.1/24 172.16.1.1/24 172.16.2.1/24 172.16.3.1/24192.168.1.1/24 S1/1S1/0 192.168.1.2/24192.168.2.2/24 S1/0S1/1 192.1