SVC application of X.25 over FR

In Figure 144, Router A is connected to Router B, Router C to Router D through X.25, and Router B is connected to Router C through FR.

Configure FR Annex G DLCI 100 on the two routers to interconnect the two X.25 networks, enabling Host A and Host B to communicate with each other.

1. Configure Router A:

   # Configure X.25 basic functions.

   <RouterA> system-view
   [RouterA] interface serial 2/0
   [RouterA-Serial2/0] link-protocol x25 dte
   [RouterA-Serial2/0] x25 x121-address 1
   [RouterA-Serial2/0] x25 map ip 1.1.1.2 x121-address 2
   [RouterA-Serial2/0] ip address 1.1.1.1 255.0.0.0
   

2. Configure Router D:

   # Configure X.25 basic functions.

   <RouterD> system-view
   [RouterD] interface serial 2/0
   [RouterD-Serial2/0] link-protocol x25 dte
   [RouterD-Serial2/0] x25 x121-address 2
   [RouterD-Serial2/0] x25 map ip 1.1.1.1 x121-address 1
   [RouterD-Serial2/0] ip address 1.1.1.2 255.0.0.0
   

3. Configure Router B:

   # Enable X.25 switching.

   <RouterB> system-view
   [RouterB] x25 switching
   

   # Configure Serial 2/0 as an X.25 interface.

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

   # Configure Serial 2/1 as an FR interface.

   [RouterB] interface serial 2/1
   [RouterB-Serial2/1] link-protocol fr
   [RouterB-Serial2/1] fr interface-type dce
   

   # Configure the FR Annex G DLCI.

   [RouterB-Serial2/1] fr dlci 100
   [RouterB-fr-dlci-Serial2/1-100] annexg dce
   

   # Configure X.25 local switching.

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

   # Configure X.25 over FR switching.

   [RouterB] x25 switch svc 2 interface serial 2/1 dlci 100
   

4. Configure Router C:

   # Enable X.25 switching.

   <RouterC> system-view
   [RouterC] x25 switching
   

   # Configure Serial 2/0 as X.25 interface.

   [RouterC] interface serial 2/0
   [RouterC-Serial2/0] link-protocol x25 dce
   

   # Configure Serial 2/1 as FR interface.

   [RouterC] interface serial 2/1
   [RouterC-Serial2/1] link-protocol fr
   

   # Configure the FR Annex G DLCI.

   [RouterC-Serial2/1] fr dlci 100
   [RouterC-fr-dlci-Serial2/1-100] annexg dte
   

   # Configure X.25 local switching.

   [RouterC] x25 switch svc 2 interface serial 2/0
   

   # Configure X.25 over FR switching.

   [RouterC] x25 switch svc 1 interface serial 2/1 dlci 100