ISDN PRI configuration example

As shown in Figure 38, configure an ISDN PRI line between Router A and Router B for data transmission.

In this example, the ISDN PRI interfaces on Router A and Router B are operating as the user side (the default). You must configure the ISDN PRI interfaces as the network side on the service provider switches connected to the routers.

1. Configure Router A:

   # Bundle timeslots into a PRI set on CE1/PRI interface E1 2/3/0.

   <RouterA> system-view
   [RouterA] controller e1 2/3/0
   [RouterA-E1 2/3/0] pri-set
   [RouterA-E1 2/3/0] quit
   

   # Configure dialer access group 1 to allow any IP packets to trigger a call setup.

   [RouterA] dialer-group 1 rule ip permit
   

   # Assign Serial 2/3/0:15 an IP address.

   [RouterA] interface serial 2/3/0:15
   [RouterA-Serial2/3/0:15] ip address 202.38.154.1 255.255.0.0
   

   # Enable C-DDR on the interface, configure the route to Router B, and assign the interface to dialer-group 1.

   [RouterA-Serial2/3/0:15] dialer circular enable
   [RouterA-Serial2/3/0:15] dialer route ip 202.38.154.2 8810154
   [RouterA-Serial2/3/0:15] dialer-group 1
   

2. Configure Router B:

   # Bundle timeslots into a PRI set on CE1/PRI interface E1 2/3/0.

   <RouterB> system-view
   [RouterB] controller e1 2/3/0
   [RouterB-E1 2/3/0] pri-set
   [RouterB-E1 2/3/0] quit
   

   # Create dialer access group 1 to allow any IP packets to trigger a call setup.

   [RouterB] dialer-group 1 rule ip permit
   

   # Assign Serial 2/3/0:15 an IP address.

   [RouterB] interface serial 2/3/0:15
   [RouterB-Serial2/3/0:15] ip address 202.38.154.2 255.255.0.0
   

   # Enable C-DDR on the interface, configure the route to Router A, and assign the interface to dialer access group 1.

   [RouterB-Serial2/3/0:15] dialer circular enable
   [RouterB-Serial2/3/0:15] dialer route ip 202.38.154.1 8810152
   [RouterB-Serial2/3/0:15] dialer-group 1
   

3. Verify the configuration:

   # Ping 202.38.154.2 from Router A to verify that the state of a B-channel on E1 2/3/0 changes to Line up.

   # Ping 202.38.154.2 again to verify that the ISDN PRI line transfers data without any losses.