Connecting routers through ISDN PRI lines
Network requirements
As shown in Figure 18, Router A is connected to Router B through ISDN PRI lines.
Figure 18: Network diagram
![](images/image16.png)
Configuration procedure
Configure Router A:
# Create an ISDN PRI interface.
<RouterA> system-view [RouterA] controller e1 1/0 [RouterA-E1 1/0] pri-set [RouterA-E1 1/0] quit
# Configure an ISDN PRI interface.
[RouterA] interface serial 1/0:15 [RouterA-Serial1/0:15] ip address 202.38.154.1 255.255.0.0 [RouterA-Serial1/0:15] isdn protocol-type dss1 [RouterA-Serial1/0:15] dialer enable-circular [RouterA-Serial1/0:15] dialer route ip 202.38.154.2 8810154 [RouterA-Serial1/0:15] dialer-group 1 [RouterA-Serial1/0:15] quit [RouterA] dialer-rule 1 ip permit
Configure Router B:
Follow the same procedures to configure Router B.