Example for Applying a Routing Policy for Importing Routes

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009 CLI-based Configuration Guide - IP Unicast Routing

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Networking Requirements

In Figure 10-5, Router B exchanges routing information with Router A through OSPF, and with Router C through IS-IS. A user wants Router B to import IS-IS routes into the OSPF network. The user also wants the route to 172.17.1.0/24 on the OSPF network to have a low preference and the route to 172.17.2.0/24 to have a tag, making it easy to reference by a routing policy.

Figure 10-5 Networking diagram for applying a routing policy for importing routes

Configuration Roadmap

The configuration roadmap is as follows:

Configure a routing policy on Router B, set the cost of the route to 172.17.1.0/24 to 100, and apply the routing policy when OSPF imports IS-IS routes. The routing policy allows the route to 172.17.1.0/24 to have a low preference.
Configure a routing policy on Router B, set the tag of the route to 172.17.2.0/24 to 20, and apply the routing policy when OSPF imports IS-IS routes. This allows the tag of the route to 172.17.2.0/24 to take effect, making it easy to reference by a routing policy.

Procedure

Assign an IP address to each interface.
# Configure IP addresses for all interfaces of RouterA.
```
<Huawei> system-view
[Huawei] sysname RouterA
[RouterA] interface gigabitethernet 1/0/0
[RouterA-GigabitEthernet1/0/0] ip address 192.168.1.1 255.255.255.0
[RouterA-GigabitEthernet1/0/0] quit
```
The configurations of RouterB and RouterC are similar to the configuration of RouterA, and are not mentioned here.

Configure IS-IS.

# Configure Router C.

[RouterC] isis

[RouterC-isis-1] is-level level-2

[RouterC-isis-1] network-entity 10.0000.0000.0001.00

[RouterC-isis-1] quit

[RouterC] interface gigabitethernet 4/0/0

[RouterC-GigabitEthernet4/0/0] isis enable

[RouterC-GigabitEthernet4/0/0] quit

[RouterC] interface gigabitethernet 1/0/0

[RouterC-GigabitEthernet1/0/0] isis enable

[RouterC-GigabitEthernet1/0/0] quit

[RouterC] interface gigabitethernet 2/0/0

[RouterC-GigabitEthernet2/0/0] isis enable

[RouterC-GigabitEthernet2/0/0] quit

[RouterC] interface gigabitethernet 3/0/0

[RouterC-GigabitEthernet3/0/0] isis enable

[RouterC-GigabitEthernet3/0/0] quit

# Configure Router B.

[RouterB] isis

[RouterB-isis-1] is-level level-2

[RouterB-isis-1] network-entity 10.0000.0000.0002.00

[RouterB-isis-1] quit

[RouterB] interface gigabitethernet 2/0/0

[RouterB-GigabitEthernet2/0/0] isis enable

[RouterB-GigabitEthernet2/0/0] quit

Configure OSPF and import routes.

# Configure RouterA and enable OSPF.

[RouterA] ospf

[RouterA-ospf-1] area 0

[RouterA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] quit

[RouterA-ospf-1] quit

# Configure RouterB. Enable OSPF and import IS-IS routes.

[RouterB] ospf

[RouterB-ospf-1] area 0

[RouterB-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255

[RouterB-ospf-1-area-0.0.0.0] quit

[RouterB-ospf-1] import-route isis 1

[RouterB-ospf-1] quit

# Check the OSPF routing table of RouterA. You can see the imported routes.

[RouterA] display ospf routing

          OSPF Process 1 with Router ID 192.168.1.1

                   Routing Tables

 Routing for Network

 Destination        Cost  Type       NextHop         AdvRouter       Area

 192.168.1.0/24     1  Stub       192.168.1.1     192.168.1.1     0.0.0.0

 Routing for ASEs

 Destination        Cost      Type       Tag         NextHop         AdvRouter

 172.17.1.0/24      1        Type2      1           192.168.1.2     192.168.1.2

 172.17.2.0/24      1        Type2      1           192.168.1.2     192.168.1.2

 172.17.3.0/24      1        Type2      1           192.168.1.2     192.168.1.2

 192.168.2.0/24     1        Type2      1           192.168.1.2     192.168.1.2

 Total Nets: 5

 Intra Area: 1  Inter Area: 0  ASE: 4  NSSA: 0

Configure the filtering list.

# Configure ACL 2002 to match 172.17.2.0/24.

[RouterB] acl number 2002

[RouterB-acl-basic-2002] rule permit source 172.17.2.0 0.0.0.255

[RouterB-acl-basic-2002] quit

# Configure the IP prefix list named prefix-a to match 172.17.1.0/24.

[RouterB] ip ip-prefix prefix-a index 10 permit 172.17.1.0 24

Configure the route-policy.

[RouterB] route-policy isis2ospf permit node 10

[RouterB-route-policy] if-match ip-prefix prefix-a

[RouterB-route-policy] apply cost 100

[RouterB-route-policy] quit

[RouterB] route-policy isis2ospf permit node 20

[RouterB-route-policy] if-match acl 2002

[RouterB-route-policy] apply tag 20

[RouterB-route-policy] quit

[RouterB] route-policy isis2ospf permit node 30

[RouterB-route-policy] quit

Apply the route-policy when the route is imported.

# Configure Router B and apply the route-policy when the route is imported.

[RouterB] ospf

[RouterB-ospf-1] import-route isis 1 route-policy isis2ospf

[RouterB-ospf-1] quit

# Check the OSPF routing table of Router A. You can see that the cost of the route with the destination address 172.17.1.0/24 is 100; the tag of the route with the destination address 172.17.2.0/24 is 20; other routing attributes remain unchanged.

[RouterA] display ospf routing

          OSPF Process 1 with Router ID 192.168.1.1

                   Routing Tables

 Routing for Network

 Destination        Cost  Type       NextHop         AdvRouter       Area

 192.168.1.0/24     1  Stub       192.168.1.1     192.168.1.1     0.0.0.0

 Routing for ASEs

 Destination        Cost      Type       Tag         NextHop         AdvRouter

 172.17.1.0/24      100      Type2      1           192.168.1.2     192.168.1.2

 172.17.2.0/24      1        Type2      20          192.168.1.2     192.168.1.2

 172.17.3.0/24      1        Type2      1           192.168.1.2     192.168.1.2

 192.168.2.0/24     1        Type2      1           192.168.1.2     192.168.1.2

 Total Nets: 5

 Intra Area: 1  Inter Area: 0  ASE: 4  NSSA: 0

Configuration Files

Configuration file of RouterA

 sysname RouterA

interface GigabitEthernet1/0/0

 ip address 192.168.1.1 255.255.255.0

ospf 1

 area 0.0.0.0

  network 192.168.1.0 0.0.0.255

return

Configuration file of RouterB

 sysname RouterB

acl number 2002

 rule 5 permit source 172.17.2.0 0.0.0.255

isis 1

 is-level level-2

 network-entity 10.0000.0000.0002.00

interface GigabitEthernet1/0/0

 ip address 192.168.1.2 255.255.255.0

interface GigabitEthernet2/0/0

 ip address 192.168.2.2 255.255.255.0

 isis enable 1

ospf 1

 import-route isis 1 route-policy isis2ospf

 area 0.0.0.0

  network 192.168.1.0 0.0.0.255

route-policy isis2ospf permit node 10

 if-match ip-prefix prefix-a

 apply cost 100

route-policy isis2ospf permit node 20

 if-match acl 2002

 apply tag 20

route-policy isis2ospf permit node 30

ip ip-prefix prefix-a index 10 permit 172.17.1.0 24

return

Configuration file of RouterC

 sysname RouterC

isis 1

 is-level level-2

 network-entity 10.0000.0000.0001.00

interface GigabitEthernet1/0/0

 ip address 172.17.1.1 255.255.255.0

 isis enable 1

interface GigabitEthernet2/0/0

 ip address 172.17.2.1 255.255.255.0

 isis enable 1

interface GigabitEthernet3/0/0

 ip address 172.17.3.1 255.255.255.0

 isis enable 1

interface GigabitEthernet4/0/0

 ip address 192.168.2.1 255.255.255.0

 isis enable 1

return

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Updated: 2022-05-16

Document ID: EDOC1000174069

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Networking Requirements

Configuration Roadmap

Procedure

Configuration Files

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