C-DCC configuration example

As shown in Figure 47, on a network segment are located three routers: Router A with the IP address of 100.1.1.1/24, Router B with the IP address of 100.1.1.2/24, and Router C with the IP address of 100.1.1.3/24.

Configure C-DCC to allow Router A to call Router B and Router C from multiple interfaces, but disable Router B and Router C from calling each other.

1. Configure Router A:

   # Configure a dial access control rule for dialer access group 1.

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

   # Assign an IP address to interface Dialer0, associate dialer access group 1 with the interface, enable C-DCC, and configure dial strings for calling Router B and Router C.

   [RouterA] interface dialer 0
   [RouterA-Dialer0] dialer enable-circular
   [RouterA-Dialer0] ip address 100.1.1.1 255.255.255.0
   [RouterA-Dialer0] dialer-group 1
   [RouterA-Dialer0] dialer route ip 100.1.1.2 8810052
   [RouterA-Dialer0] dialer route ip 100.1.1.3 8810063
   [RouterA-Dialer0] quit
   

   # Set interface Serial 2/0 to operate in asynchronous protocol mode and assign it to dialer circular group 0.

   [RouterA] interface serial 2/0
   [RouterA-Serial2/0] physical-mode async
   [RouterA-Serial2/0] async mode protocol
   [RouterA-Serial2/0] dialer circular-group 0
   [RouterA-Serial2/0] quit
   

   # Configure interface Serial 2/1 to operate in asynchronous protocol mode and assign it to dialer circular group 0.

   [RouterA] interface serial 2/1
   [RouterA-Serial2/1] physical-mode async
   [RouterA-Serial2/1] async mode protocol
   [RouterA-Serial2/1] dialer circular-group 0
   [RouterA-Serial2/1] quit
   

   # Enable modem dial-in and dial-out on user interfaces to be used.

   [RouterA] user-interface tty1
   [RouterA-ui-tty1] modem both
   [RouterA-ui-tty1] quit
   [RouterA] user-interface tty2
   [RouterA-ui-tty2] modem both
   

2. Configure Router B:

   # Configure a dial access control rule for dialer access group 1.

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

   # Configure interface Serial 2/0 to operate in asynchronous protocol mode.

   [RouterB] interface serial 2/0
   [RouterB-Serial2/0] physical-mode async
   [RouterB-Serial2/0] async mode protocol
   

   # Assign an IP address to interface Serial 2/0, associate dialer access group 1 with the interface, enable C-DCC, and configure two dial strings for calling Router A.

   [RouterB-Serial2/0] ip address 100.1.1.2 255.255.255.0
   [RouterB-Serial2/0] dialer enable-circular
   [RouterB-Serial2/0] dialer-group 1
   [RouterB-Serial2/0] dialer route ip 100.1.1.1 8810048
   [RouterB-Serial2/0] dialer route ip 100.1.1.1 8810049
   [RouterB-Serial2/0] quit
   

   # Enable modem dial-in and dial-out on the user interface to be used.

   [RouterB] user-interface tty1
   [RouterB-ui-tty1] modem both
   

3. Configure Router C:

   # Configure a dial access control rule for dialer access group 1.

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

   # Configure interface Serial 2/0 to operate in asynchronous protocol mode.

   [RouterC] interface serial 2/0
   [RouterC-Serial2/0] physical-mode async
   [RouterC-Serial2/0] async mode protocol
   

   # Assign an IP address to interface Serial 2/0, associate dialer access group 1 with the interface, enable C-DCC, and configure two dial strings for calling Router A.

   [RouterC-Serial2/0] ip address 100.1.1.3 255.255.255.0
   [RouterC-Serial2/0] dialer enable-circular
   [RouterC-Serial2/0] dialer-group 1
   [RouterC-Serial2/0] dialer route ip 100.1.1.1 8810048
   [RouterC-Serial2/0] dialer route ip 100.1.1.1 8810049
   [RouterC-Serial2/0] quit
   

   # Enable modem dial-in and dial-out on the user interface to be used.

   [RouterC] user-interface tty1
   [RouterC-ui-tty1] modem both