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1、Configuring Route Summarization with BGP,CIDR 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.,Network Boundary Summarization,BGP, 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-summary,Router(config-route

2、r)#,BGP network Command,network network-number mask network-mask,Router(config-router)#,ip route prefix mask null0,Router(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.,BGP Summarization Using the network Command and Static Route to Null 0,Configuri

3、ng BGP for Aggregate Addressing,aggregate-address ip-address mask summary-only as-set,Router(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.,BGP Summarization Using the aggregate-address Command,BGP Aggregation,show ip bgp,Networ

4、k 192.168.24.0/22 192.168.24.0 192.168.25.0 192.168.26.0 192.168.27.0,*s s s s,Next Hop 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0,LocPrf,Weight 32768 32768 32768 32768 32768,Path i i i i i,Metric 0 0 0 0 0,routerC# show ip bgp BGP table version is 28, local router ID is 172.16.2.1 Status codes: s = su

5、ppressed, * = valid, = best, and i = internal Origin codes : i = IGP, e = EGP, and ? = incomplete,RouterC#,LAB 1 : BGP路由汇总,AS 64512,AS 64513,l0172.16.1.1/24172.16.2.1/24172.16.3.1/24172.16.4.1/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,R3,R2,R1,S1/1192.168.1.1/24,192.168.1.2/24S1/0,ip route 172.16.0.0

6、 255.255.0.0 null0router bgp 64512 network 172.16.0.0 mask 255.255.0.0,LAB 2 : BGP路由汇总,AS 64512,AS 64513,l0172.16.1.1/24172.16.2.1/24172.16.3.1/24172.16.4.1/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,R3,R2,R1,S1/1192.168.1.1/24,192.168.1.2/24S1/0,router bgp 64512 aggregate-address 172.16.0.0 255.255.0

7、.0 summary-only as-set,END,Configuring BGP Route Filtering,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,LAB 1 : 使用distribute-list过滤BGP路由,131.130.0.1/24131.130.1.1/24131.

8、130.2.1/24131.130.3.1/24,R1,R3,R2,172.16.0.1/24172.16.1.1/24172.16.2.1/24172.16.3.1/24,192.168.1.1/24S1/1,S1/0192.168.1.2/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,AS 64512,AS 64513,access-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

9、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 1 neighbor 192.168.2.2 distribute-list 2 in neighbor 192.168.2.2 distribute-list 1 out,LAB 2 : 使用route-map过滤BGP路由,131.130.0.1/24131.130.1.1/24131.130.2.1/24131.130.3.1/24,R1,R3,R2,172.16.0.1/24172

10、.16.1.1/24172.16.2.1/24172.16.3.1/24,192.168.1.1/24S1/1,S1/0192.168.1.2/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,AS 64512,AS 64513,access-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

11、.16.3.0 0.0.0.255 access-list 2 permit any! route-map from_as_64513 permit 10 match ip address 2 ! route-map to_as_64513 permit 10 match ip address 1!router bgp 1 neighbor 192.168.2.2 route-map from_as_64513 in neighbor 192.168.2.2 route-map to_as_64513 out,LAB 3 : 使用prefix-list过滤BGP路由一,131.130.0.1/

12、24131.130.1.1/24131.130.2.1/24131.130.3.1/24,R1,R3,R2,172.16.0.1/24172.16.1.1/24172.16.2.1/24172.16.3.1/24,192.168.1.1/24S1/1,S1/0192.168.1.2/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,AS 64512,AS 64513,ip prefix-list from_64513 seq 5 permit 172.16.0.0/24 ip prefix-list from_64513 seq 10 permit 172.16

13、.1.0/24 ! ip prefix-list to_64513 seq 5 permit 131.130.2.0/24 ip prefix-list to_64513 seq 10 permit 131.130.3.0/24!router bgp 1 neighbor 192.168.2.2 prefix-list from_64513 in neighbor 192.168.2.2 prefix-list to_64513 out,LAB 4 : 使用prefix-list过滤BGP路由二,131.130.0.1/24131.130.1.1/25131.130.2.1/26131.130

14、.3.1/27131.130.4.1/28,R1,R3,R2,192.168.1.1/24S1/1,S1/0192.168.1.2/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,AS 64512,AS 64513,ip prefix-list test_prefix seq 5 permit 131.130.0.0/24! router bgp 1 neighbor 192.168.2.1 prefix-list test_prefix out,131.130.0.0/24,LAB 5 : 使用prefix-list过滤BGP路由三,131.130.0.1/

15、24131.130.1.1/25131.130.2.1/26131.130.3.1/27131.130.4.1/28,R1,R3,R2,192.168.1.1/24S1/1,S1/0192.168.1.2/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,AS 64512,AS 64513,ip prefix-list test_prefix permit 131.130.0.0/22 ge 26! router bgp 1 neighbor 192.168.2.1 prefix-list to_as_2 out,131.130.2.0/26131.130.3.

16、0/27,LAB 4 : 使用prefix-list过滤BGP路由四,131.130.0.1/24131.130.1.1/25131.130.2.1/26131.130.3.1/27131.130.4.1/28,R1,R3,R2,192.168.1.1/24S1/1,S1/0192.168.1.2/24,192.168.2.2/24S1/0,S1/1192.168.2.1/24,AS 64512,AS 64513,ip prefix-list test_prefix permit 131.130.0.0/22 le 26! router bgp 1 neighbor 192.168.2.2 prefix-list to_as_2 out,131.130.0.0/24131.130.1.0/25131.130.2.0/26,LAB 4 : 使用prefix-list过滤BGP路由五,131.130.0.1/24131.130.1.1/25131.130.2.1/26131.130.3.1/27131.130.4.

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