实验目的：理解as-set关键字 （为了实验测试，路由器全部运行在一个OSPF区域0而那两个网云用BGP通告）

R1的配置

interface Loopback0 ip address 1.1.1.1 255.255.255.0 ip ospf network point-to-point ! interface Ethernet0/0 ip address 15.1.1.1 255.255.255.0 ! router ospf 10 log-adjacency-changes network 0.0.0.0 255.255.255.255 area 0 ! router bgp 10 no synchronization bgp log-neighbor-changes neighbor 15.1.1.5 remote-as 50 no auto-summary

R5的配置

interface Loopback0 ip address 5.5.5.5 255.255.255.0 ip ospf network point-to-point ! interface Ethernet0/0 ip address 15.1.1.5 255.255.255.0 ! interface Serial1/0 ip address 35.1.1.5 255.255.255.0 serial restart-delay 0 ! interface Serial2/0 ip address 45.1.1.5 255.255.255.0 serial restart-delay 0 ! router ospf 10 log-adjacency-changes network 0.0.0.0 255.255.255.255 area 0 ! router bgp 50 no synchronization bgp router-id 5.5.5.5 bgp log-neighbor-changes aggregate-address 192.168.12.0 255.255.252.0 summary-only neighbor 15.1.1.1 remote-as 10 neighbor 35.1.1.3 remote-as 30 neighbor 45.1.1.4 remote-as 40 no auto-summary

R3的配置

interface Loopback0 ip address 3.3.3.3 255.255.255.0 ip ospf network point-to-point ! interface Loopback1 ip address 192.168.13.1 255.255.255.0 secondary ip address 192.168.12.1 255.255.255.0 ! interface Serial2/0 ip address 35.1.1.3 255.255.255.0 serial restart-delay 0 ! router ospf 10 log-adjacency-changes network 3.3.3.0 0.0.0.255 area 0 network 35.1.1.0 0.0.0.255 area 0 ! router bgp 30 no synchronization bgp router-id 3.3.3.3 bgp log-neighbor-changes network 192.168.12.0 network 192.168.13.0 neighbor 35.1.1.5 remote-as 50 no auto-summary

R4的配置

interface Loopback0 ip address 4.4.4.4 255.255.255.0 ip ospf network point-to-point ! interface Loopback1 ip address 192.168.15.1 255.255.255.0 secondary ip address 192.168.14.1 255.255.255.0 ! interface Serial1/0 ip address 45.1.1.4 255.255.255.0 ! router ospf 10 log-adjacency-changes network 4.4.4.0 0.0.0.255 area 0 network 45.1.1.0 0.0.0.255 area 0 ! router bgp 40 no synchronization bgp router-id 4.4.4.4 bgp log-neighbor-changes network 192.168.14.0 network 192.168.15.0 neighbor 45.1.1.5 remote-as 50 no auto-summary

没有使用as-set关键字时
r1#sho ip bgp 192.168.12.0/22
BGP routing table entry for 192.168.12.0/22, version 12
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Flag: 0x820
Not advertised to any peer
50, (aggregated by 50 5.5.5.5)
15.1.1.5 from 15.1.1.5 (5.5.5.5)
Origin IGP, metric 0, localpref 100, valid, external, atomic-aggregate, best

r5(config-router)#aggregate-address 192.168.12.0 255.255.252.0 summary-only as-set
使用了关键字as-set后再查看
r1#sho ip bgp 192.168.12.0/22
BGP routing table entry for 192.168.12.0/22, version 13
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Not advertised to any peer
50 {30,40}, (aggregated by 50 5.5.5.5)
15.1.1.5 from 15.1.1.5 (5.5.5.5)
Origin IGP, metric 0, localpref 100, valid, external, best

理解了,楼主还搞得这么复杂,不过辛苦了,谢谢你

我喜欢:handshake :handshake