Dynamic route backup configuration example 1

As shown in Figure 58:

• Router B is connected to Router A and Router C through serial interfaces connecting to two X.25 networks.

• Router A and Router C are connected to the same ISDN switched network through their ISDN BRI interfaces. Router A and Router C can call each other. The telephone number of Router C is 8810052.

• The serial interfaces are in network segment 10.0.0.0/8 and the BRI interfaces are in network segment 20.0.0.0/8.

Use Router A as the master device of a dynamic route backup group to monitor network segment 30.0.0.0/8, which is connected to Router C.

1. Configure Router A:

   # Create a dialer access group rule.

   <RouterA> system-view
   [RouterA] dialer-rule 1 ip permit
   

   # Configure dialup parameters for interface BRI 3/0.

   [RouterA] interface bri 3/0
   [RouterA-Bri3/0] ip address 20.0.0.1 8
   [RouterA-Bri3/0] dialer enable-circular
   [RouterA-Bri3/0] dialer-group 1
   [RouterA-Bri3/0] dialer route ip 30.0.0.1 8810052
   [RouterA-Bri3/0] quit
   

   # Configure interface Serial 2/0 and enable X.25 encapsulation on the interface.

   [RouterA] interface serial 2/0
   [RouterA-Serial2/0] link-protocol x25 dte ietf
   [RouterA-Serial2/0] x25 x121-address 10
   [RouterA-Serial2/0] x25 map ip 10.0.0.2 x121-address 15 broadcast
   [RouterA-Serial2/0] ip address 10.0.0.1 8
   [RouterA-Serial2/0] quit
   

   # Configure RIP.

   [RouterA] rip
   [RouterA-rip-1] network 10.0.0.0
   [RouterA-rip-1] network 20.0.0.0
   [RouterA-rip-1] import-route direct
   [RouterA-rip-1] quit
   

   # Create a dynamic route backup group.

   [RouterA] standby routing-rule 1 ip 30.0.0.1 32
   

   # Configure the routes used by the serial interface to adopt higher priorities over those used by the dialup interface.

   [RouterA] interface bri 3/0
   [RouterA-Bri3/0] rip metricin 2
   

   # Enable dynamic route backup.

   [RouterA-Bri3/0] standby routing-group 1
   

2. Configure Router B:

   # Enable X.25 switching on Router B.

   <RouterB> system-view
   [RouterB] x25 switching
   

   # Configure Serial 2/0 and Serial 2/1 as X.25 interfaces.

   [RouterB] interface serial 2/0
   [RouterB-Serial2/0] link-protocol x25 dce ietf
   [RouterB-Serial2/0] quit
   [RouterB] interface serial 2/1
   [RouterB-Serial2/1] link-protocol x25 dce ietf
   [RouterB-Serial2/1] quit
   

   # Configure switching information for X.25.

   [RouterB] x25 switch svc 10 interface serial 2/0
   [RouterB] x25 switch svc 15 interface serial 2/1
   

3. Configure Router C:

   # Create a dialer access group rule.

   <RouterC> system-view
   [RouterC] dialer-rule 1 ip permit
   

   # Configure dialup parameters for interface BRI 3/0.

   [RouterC] interface bri 3/0
   [RouterC-Bri3/0] ip address 20.0.0.2 8
   [RouterC-Bri3/0] dialer enable-circular 
   [RouterC-Bri3/0] dialer-group 1
   [RouterC-Bri3/0] quit
   

   # Configure interface Serial 2/1 and enable X.25 encapsulation on the interface.

   [RouterC] interface serial 2/1
   [RouterC-Serial2/1] link-protocol x25 dte ietf
   [RouterC-Serial2/1] x25 x121-address 15
   [RouterC-Serial2/1] x25 map ip 10.0.0.1 x121-address 10 broadcast
   [RouterC-Serial2/1] ip address 10.0.0.2 8
   [RouterC-Serial2/1] quit
   

   # Configure interface Loopback 1.

   [RouterC] interface loopback 1
   [RouterC-Loopback1] ip address 30.0.0.1 32
   [RouterC-Loopback1] quit
   

   # Configure RIP.

   [RouterC] rip
   [RouterC-rip-1] network 10.0.0.0
   [RouterC-rip-1] network 20.0.0.0
   [RouterC-rip-1] network 30.0.0.0
   [RouterC-rip-1] import-route direct