Configuring RIP FRR

Network requirements

As shown in Figure 15, Switch A, Switch B, and Switch C run RIPv2. Configure RIP FRR so that when Link A becomes unidirectional, services can be switched to Link B immediately.

Figure 15: Network diagram

Table 8: Interface and IP address assignment

Device

Interface

IP address

Switch A

VLAN-interface 100

12.12.12.1/24

Switch A

VLAN-interface 200

13.13.13.1/24

Switch A

Loopback 0

1.1.1.1/32

Switch B

VLAN-interface 101

24.24.24.4/24

Switch B

VLAN-interface 200

13.13.13.2/24

Switch B

Loopback 0

4.4.4.4/32

Switch C

VLAN-interface 100

12.12.12.2/24

Switch C

VLAN-interface 101

24.24.24.2/24

Configuration procedure

  1. Configure IP addresses and subnet masks for interfaces on the switches. (Details not shown.)

  2. Configure RIPv2 on the switches to make sure Switch A, Switch B, and Switch C can communicate with each other at Layer 3. (Details not shown.)

  3. Configure RIP FRR:

    # Configure Switch A.

    <SwitchA> system-view
    [SwitchA] ip prefix-list abc index 10 permit 4.4.4.4 32
    [SwitchA] route-policy frr permit node 10
    [SwitchA-route-policy-frr-10] if-match ip address prefix-list abc
    [SwitchA-route-policy-frr-10] apply fast-reroute backup-interface vlan-interface 100 backup-nexthop 12.12.12.2
    [SwitchA-route-policy-frr-10] quit
    [SwitchA] rip 1
    [SwitchA-rip-1] fast-reroute route-policy frr
    [SwitchA-rip-1] quit
    

    # Configure Switch B.

    <SwitchB> system-view
    [SwitchB] ip prefix-list abc index 10 permit 1.1.1.1 32
    [SwitchB] route-policy frr permit node 10
    [SwitchB-route-policy-frr-10] if-match ip address prefix-list abc
    [SwitchB-route-policy-frr-10] apply fast-reroute backup-interface vlan-interface 101 backup-nexthop 24.24.24.2
    [SwitchB-route-policy-frr-10] quit
    [SwitchB] rip 1
    [SwitchB-rip-1] fast-reroute route-policy frr
    [SwitchB-rip-1] quit
    

Verifying the configuration

# Display route 4.4.4.4/32 on Switch A to view the backup next hop information.

[SwitchA] display ip routing-table 4.4.4.4 verbose

Summary Count : 1

Destination: 4.4.4.4/32
   Protocol: RIP             
 Process ID: 1
  SubProtID: 0x1                     Age: 04h20m37s
       Cost: 1                Preference: 100
      IpPre: N/A              QosLocalID: N/A
        Tag: 0                     State: Active Adv
  OrigTblID: 0x0                 OrigVrf: default-vrf
    TableID: 0x2                  OrigAs: 0
      NibID: 0x26000002           LastAs: 0
     AttrID: 0xffffffff         Neighbor: 13.13.13.2
      Flags: 0x1008c         OrigNextHop: 13.13.13.2
      Label: NULL            RealNextHop: 13.13.13.2
    BkLabel: NULL              BkNextHop: 12.12.12.2
  Tunnel ID: Invalid           Interface: Vlan-interface200
BkTunnel ID: Invalid         BkInterface: Vlan-interface100
   FtnIndex: 0x0            TrafficIndex: N/A
  Connector: N/A

# Display route 1.1.1.1/32 on Switch B to view the backup next hop information.

[SwitchB] display ip routing-table 1.1.1.1 verbose

Summary Count : 1

Destination: 1.1.1.1/32
   Protocol: RIP             
 Process ID: 1
  SubProtID: 0x1                     Age: 04h20m37s
       Cost: 1                Preference: 100
      IpPre: N/A              QosLocalID: N/A
        Tag: 0                     State: Active Adv
  OrigTblID: 0x0                 OrigVrf: default-vrf
    TableID: 0x2                  OrigAs: 0
      NibID: 0x26000002           LastAs: 0
     AttrID: 0xffffffff         Neighbor: 13.13.13.1
      Flags: 0x1008c         OrigNextHop: 13.13.13.1
      Label: NULL            RealNextHop: 13.13.13.1
    BkLabel: NULL              BkNextHop: 24.24.24.2
  Tunnel ID: Invalid           Interface: Vlan-interface200
BkTunnel ID: Invalid         BkInterface: Vlan-interface101
   FtnIndex: 0x0            TrafficIndex: N/A
  Connector: N/A