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CloudEngine 12800 and 12800E V200R005C10 Configuration Guide - IP Unicast Routing

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

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Example for Applying a Routing Policy for Importing Routes

Example for Applying a Routing Policy for Importing Routes

Networking Requirements

In Figure 10-5, SwitchB exchanges routing information with SwitchA through OSPF, and with SwitchC through IS-IS. A user wants SwitchB to import IS-IS routes into the OSPF network. The user also wants the route to 172.17.1.0/24 that is imported into 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:

  1. Configure a routing policy on SwitchB, 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.

  2. Configure the routing policy on SwitchB, 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

  1. Add interfaces to VLANs. 

    <HUAWEI> system-view
[~HUAWEI] sysname SwitchA
[*HUAWEI] commit
[~SwitchA] vlan 10
[*SwitchA-vlan10] quit
[*SwitchA] interface 10ge 1/0/1
[*SwitchA-10GE1/0/1] port link-type trunk
[*SwitchA-10GE1/0/1] port trunk allow-pass vlan 10
[*SwitchA-10GE1/0/1] quit
[*SwitchA] commit

    The configurations of SwitchB and SwitchC are similar to the configuration of SwitchA, and are not described here.

  2. Assign IP addresses to VLANIF interfaces. 

    [~SwitchA] interface vlanif 10
[*SwitchA-Vlanif10] ip address 192.168.1.1 24
[*SwitchA-Vlanif10] quit
[*SwitchA] commit

    The configurations of SwitchB and SwitchC are similar to the configuration of SwitchA, and are not described here.

  3. Configure IS-IS.

    # Configure SwitchC.

    [~SwitchC] isis
[*SwitchC-isis-1] is-level level-2
[*SwitchC-isis-1] network-entity 10.0000.0000.0001.00
[*SwitchC-isis-1] quit
[*SwitchC] interface vlanif 20
[*SwitchC-Vlanif20] isis enable
[*SwitchC-Vlanif20] quit
[*SwitchC] interface vlanif 30
[*SwitchC-Vlanif30] isis enable
[*SwitchC-Vlanif30] quit
[*SwitchC] interface vlanif 40
[*SwitchC-Vlanif40] isis enable
[*SwitchC-Vlanif40] quit
[*SwitchC] interface vlanif 50
[*SwitchC-Vlanif50] isis enable
[*SwitchC-Vlanif50] quit
[*SwitchC] commit

    # Configure Switch B.

    [~SwitchB] isis
[*SwitchB-isis-1] is-level level-2
[*SwitchB-isis-1] network-entity 10.0000.0000.0002.00
[*SwitchB-isis-1] quit
[*SwitchB] interface vlanif 20
[*SwitchB-Vlanif20] isis enable
[*SwitchB-Vlanif20] quit
[*SwitchB] commit

  4. Configure OSPF and import routes.

    # Configure SwitchA and enable OSPF.

    [~SwitchA] ospf
[*SwitchA-ospf-1] area 0
[*SwitchA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
[*SwitchA-ospf-1-area-0.0.0.0] quit
[*SwitchA-ospf-1] quit
[*SwitchA] commit

    # Configure SwitchB, enable OSPF, and import IS-IS routes.

    [~SwitchB] ospf
[*SwitchB-ospf-1] area 0
[*SwitchB-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
[*SwitchB-ospf-1-area-0.0.0.0] quit
[*SwitchB-ospf-1] import-route isis 1
[*SwitchB-ospf-1] quit
[*SwitchB] commit

    # Check the OSPF routing table on SwitchA. You will see the imported routes.

    [~SwitchA] 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

  5. Configure a filtering list.

    # Set ACL 2002 to match 172.17.2.0/24.

    [~SwitchB] acl number 2002
[*SwitchB-acl-basic-2002] rule permit source 172.17.2.0 0.0.0.255
[*SwitchB-acl-basic-2002] quit
[*SwitchB] commit

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

    [~SwitchB] ip ip-prefix prefix-a index 10 permit 172.17.1.0 24
[*SwitchB] commit

  6. Configure a routing policy. 

    [~SwitchB] route-policy isis2ospf permit node 10
[*SwitchB-route-policy] if-match ip-prefix prefix-a
[*SwitchB-route-policy] apply cost 100
[*SwitchB-route-policy] quit
[*SwitchB] route-policy isis2ospf permit node 20
[*SwitchB-route-policy] if-match acl 2002
[*SwitchB-route-policy] apply tag 20
[*SwitchB-route-policy] quit
[*SwitchB] route-policy isis2ospf permit node 30  
[*SwitchB-route-policy] quit
[*SwitchB] commit

  7. Apply the routing policy when routes are imported.

    # Configure SwitchB and apply the routing policy when routes are imported.

    [~SwitchB] ospf
[*SwitchB-ospf-1] import-route isis 1 route-policy isis2ospf
[*SwitchB-ospf-1] quit
[*SwitchB] commit

    # Check the OSPF routing table on SwitchA. You will see that the cost of the route to 172.17.1.0/24 is 100, the tag of the route to 172.17.2.0/24 is 20, and other route attributes remain unchanged.

    [~SwitchA] 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 SwitchA
    #
 sysname SwitchA
#
 vlan batch 10
#
interface Vlanif10
 ip address 192.168.1.1 255.255.255.0
#
interface 10GE1/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
ospf 1
 area 0.0.0.0
  network 192.168.1.0 0.0.0.255
#
return
  • Configuration file of SwitchB
    #
 sysname SwitchB
#
 vlan batch 10 20
#
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 Vlanif10
 ip address 192.168.1.2 255.255.255.0
#
interface Vlanif20
 ip address 192.168.2.2 255.255.255.0
 isis enable 1
#
interface 10GE1/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface 10GE1/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
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 SwitchC
    #
 sysname SwitchC
#
 vlan batch 20 30 40 50
#
isis 1
 is-level level-2
 network-entity 10.0000.0000.0001.00
#
interface Vlanif20
 ip address 192.168.2.1 255.255.255.0
 isis enable 1
#
interface Vlanif30
 ip address 172.17.1.1 255.255.255.0
 isis enable 1
#
interface Vlanif40
 ip address 172.17.2.1 255.255.255.0
 isis enable 1
#
interface Vlanif50
 ip address 172.17.3.1 255.255.255.0
 isis enable 1
#
interface 10GE1/0/1
 port link-type trunk
 port trunk allow-pass vlan 20
#
interface 10GE1/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
interface 10GE1/0/3
 port link-type trunk
 port trunk allow-pass vlan 40
#
interface 10GE1/0/4
 port link-type trunk
 port trunk allow-pass vlan 50
#
return
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Updated: 2021-09-17

Document ID: EDOC1100075354

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