topo
ip规划：各路由器之间线路为路由器编号，r1和r2间为10.1.12.0 24
办公网段为10.100.1.1 32 业务网段为10.200.1.1 32
1，ospf区域分割+虚链路
右边area 1 左边aera 0
R1 ospf配置
ospf 1 router-id 1.1.1.1
area 0.0.0.0
network 10.100.1.0 0.0.0.255
network 10.1.12.0 0.0.0.255
area 0.0.0.1
network 10.1.13.0 0.0.0.255
network 10.200.1.0 0.0.0.255
R2
ospf 1 router-id 2.2.2.2
area 0.0.0.0
network 10.1.0.0 0.0.255.255
R3
ospf 1 router-id 3.3.3.3
area 0.0.0.1
network 10.1.0.0 0.0.255.255
R4
ospf 1 router-id 4.4.4.4
area 0.0.0.0
network 10.1.24.0 0.0.0.255
area 0.0.0.1
network 10.1.34.0 0.0.0.255
虚链路
R1
进ospf area 1
vlink-peer 4.4.4.4
R4
进ospf area 1
vlink-peer 1.1.1.1
结果
断r1和r2之间链路
断r1和r3之间链路
2 ，ospf的重发布+router-policy
R1和r2r3上面为ospf1 r4和r2r3下面为ospf2
r1 ospf配置
ospf 1 router-id 1.1.1.1
area 0.0.0.0
network 10.0.0.0 0.255.255.255
R2
ospf 1 router-id 2.2.2.2
area 0.0.0.0
network 10.1.12.0 0.0.0.255
ospf 2 router-id 22.22.22.22
area 0.0.0.0
network 10.1.24.0 0.0.0.255
R3
ospf 1 router-id 3.3.3.3
area 0.0.0.0
network 10.1.13.0 0.0.0.255
ospf 2 router-id 33.33.33.33
area 0.0.0.0
network 10.1.34.0 0.0.0.255
R4
ospf 2 router-id 44.44.44.44
area 0.0.0.0
network 10.1.0.0 0.0.255.255
R2和r3用前缀列表抓取流量
ip ip-prefix 10 permit 10.200.1.0 24 greater-equal 25
ip ip-prefix 10 permit 10.100.1.0 24 greater-equal 25
router-policy
R2
route-policy k permit node 10
if-match ip-prefix 10
apply cost + 1
R3
route-policy k permit node 10
if-match ip-prefix 10
apply cost + 1
结果
断r1和r2之间链路
3，最长匹配原则
R2和r3进行路由汇总
R1 ospf配置
ospf 1 router-id 1.1.1.1
area 0.0.0.0
network 10.0.0.0 0.255.255.255
R2
ospf 1
area 0.0.0.0
abr-summary 10.200.0.0 255.255.0.0
network 10.1.12.0 0.0.0.255
area 0.0.0.1
network 10.1.24.0 0.0.0.255
R3
ospf 1
area 0.0.0.0
abr-summary 10.100.0.0 255.255.0.0
network 10.1.13.0 0.0.0.255
area 0.0.0.1
network 10.1.34.0 0.0.0.255
r4
ospf 1
area 0.0.0.1
network 10.1.0.0 0.0.255.255
汇总后r4的路由表
结果
断掉r1和r2之间的链路