拓扑图

image_686197790900913.png

设备配置

AR1

sys
sysname AR1
#
interface GigabitEthernet0/0/0
 ip address 12.1.1.1 255.255.255.0
#
interface GigabitEthernet0/0/1
 ip address 13.1.1.1 255.255.255.0
#
interface GigabitEthernet0/0/2
 ip address 192.168.1.1 255.255.255.0
#
ospf 1 router-id 1.1.1.1
 area 0.0.0.0
  network 12.1.1.0 0.0.0.255
  network 13.1.1.0 0.0.0.255
  network 192.168.1.0 0.0.0.255

AR2

sys
sysname AR2
#
interface GigabitEthernet0/0/0
 ip address 12.1.1.2 255.255.255.0
#
interface GigabitEthernet0/0/1
 ip address 24.1.1.2 255.255.255.0
#
interface GigabitEthernet0/0/2
 ip address 23.1.1.2 255.255.255.0
#
// 1. 配置 OSPF
ospf 1 router-id 2.2.2.2
 import-route isis 1 route-policy OSPF_IMPORT  // 引入IS-IS，调用策略
 area 0.0.0.0
  network 12.1.1.0 0.0.0.255
  network 23.1.1.0 0.0.0.255
#
// 2. 配置 IS-IS
isis 1
 is-level level-2
 network-entity 49.0001.0000.0000.0002.00
 import-route ospf 1 route-policy ISIS_IMPORT  // 引入OSPF，调用策略
#
interface GigabitEthernet0/0/1
 isis enable 1
#
interface GigabitEthernet0/0/2
 isis enable 1
#
// 3. 配置路由策略 (Route-Policy)

// 策略A：控制 OSPF 引入 IS-IS 的路由 (AR2作为主链路，Cost设小)
route-policy ISIS_IMPORT permit node 10
 apply cost 10        // 设置IS-IS开销为10
 apply tag 20         // 打标签20，防止回传
#
// 策略B：控制 IS-IS 引入 OSPF 的路由 (AR2作为主链路)
route-policy OSPF_IMPORT permit node 10
 apply cost 10        // 设置OSPF Type 2 Cost为10
 apply tag 20

AR3

sys
sysname AR3
#
interface GigabitEthernet0/0/0
 ip address 13.1.1.3 255.255.255.0
#
interface GigabitEthernet0/0/1
 ip address 34.1.1.3 255.255.255.0
#
interface GigabitEthernet0/0/2
 ip address 23.1.1.3 255.255.255.0
#
// 1. 配置 OSPF
ospf 1 router-id 3.3.3.3
 import-route isis 1 route-policy OSPF_IMPORT
 area 0.0.0.0
  network 13.1.1.0 0.0.0.255
  network 23.1.1.0 0.0.0.255
#
// 2. 配置 IS-IS
isis 1
 is-level level-2
 network-entity 49.0001.0000.0000.0003.00
 import-route ospf 1 route-policy ISIS_IMPORT
#
interface GigabitEthernet0/0/1
 isis enable 1
#
interface GigabitEthernet0/0/2
 isis enable 1
#
// 3. 配置路由策略 (Route-Policy)
// 注意：这里Cost设为100，实现备份路径效果

// 策略A：OSPF -> IS-IS
route-policy ISIS_IMPORT permit node 10
 apply cost 100       // 备份链路开销大
 apply tag 30
#
// 策略B：IS-IS -> OSPF
route-policy OSPF_IMPORT permit node 10
 apply cost 100
 apply tag 30

AR4

sys
sysname AR4
#
interface GigabitEthernet0/0/0
 ip address 24.1.1.4 255.255.255.0
#
interface GigabitEthernet0/0/1
 ip address 34.1.1.4 255.255.255.0
#
interface GigabitEthernet0/0/2
 ip address 192.168.2.1 255.255.255.0
#
isis 1
 is-level level-2      // 简化配置，使用L2
 network-entity 49.0001.0000.0000.0004.00
#
interface GigabitEthernet0/0/0
 isis enable 1
#
interface GigabitEthernet0/0/1
 isis enable 1
#
interface GigabitEthernet0/0/2
 isis enable 1