Dynamic route backup configuration example 3
Network requirements
As shown in Figure 60:
Router A and Router B are connected through an X.25 network.
Router A and Router B are connected to the same ISDN switched network through their ISDN BRI interfaces, each of which has two B channels bound in it. Router A and Router B can call each other through a resource-shared DCC (RS-DCC). The telephone number of Router A is 8810010, and that of Router B is 8810052.
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 B.
The X.25 link functions as the primary link between Router A and Router B. When the route to network segment 30.0.0.0/8 becomes invalid (for example, when the X.25 network fails), Router A automatically establishes an ISDN BRI link to router B.
Figure 60: Network diagram
Configuration procedure
Configure Router A:
# Create a dialer access group rule and a local user database.
<RouterA> system-view [RouterA] dialer-rule 1 ip permit [RouterA] local-user userb [RouterA-luser-userb] password simple userb [RouterA-luser-userb] service-type ppp [RouterA-luser-userb] quit
# Create a dynamic route backup group.
[RouterA] standby routing-rule 1 ip 30.0.0.1 32
# Configure an RS-DCC on Dialer0.
[RouterA] interface dialer 0 [RouterA-Dialer0] link-protocol ppp [RouterA-Dialer0] ip address 20.0.0.1 24 [RouterA-Dialer0] dialer user userb [RouterA-Dialer0] dialer-group 1 [RouterA-Dialer0] dialer bundle 1 [RouterA-Dialer0] dialer number 8810052 [RouterA-Dialer0] ppp authentication-mode pap [RouterA-Dialer0] ppp pap local-user usera password simple usera [RouterA-Dialer0] standby routing-group 1 [RouterA-Dialer0] quit
# Bind BRI 3/0 to Dialer 0.
[RouterA] interface bri 3/0 [RouterA-Bri3/0] dialer bundle-member 1 [RouterA-Bri3/0] ppp authentication-mode pap [RouterA-Bri3/0] ppp pap local-user usera password simple usera [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 20 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
# Configure the routes used by the serial interface to adopt higher priorities than those used by the dialup interface.
[RouterA] interface bri 3/0 [RouterA-Bri3/0] rip metricin 2
Configure Router B:
# Create a dialer access group rule and configure a local user database.
<RouterB> system-view [RouterB] dialer-rule 1 ip permit [RouterB] local-user usera [RouterB-luser-usera] password simple usera [RouterB-luser-usera] service-type ppp [RouterB-luser-usera] quit
# Configure an R-DCC on Dialer 0.
[RouterB] interface dialer 0 [RouterB-Dialer0] link-protocol ppp [RouterB-Dialer0] ip address 20.0.0.2 24 [RouterB-Dialer0] dialer user usera [RouterB-Dialer0] dialer-group 1 [RouterB-Dialer0] dialer bundle 1 [RouterB-Dialer0] dialer number 8810010 [RouterB-Dialer0] ppp authentication-mode pap [RouterB-Dialer0] ppp pap local-user userb password simple userb [RouterB-Dialer0] quit
# Configure dialup parameters for interface BRI 3/0.
[RouterB] interface bri 3/0 [RouterB-Bri3/0] dialer bundle-member 1 [RouterB-Bri3/0] ppp authentication-mode pap [RouterB-Bri3/0] ppp pap local-user userb password simple userb [RouterB-Bri3/0] quit
# Configure interface Serial 2/1 and enable X.25 encapsulation on the interface.
[RouterB] interface serial 2/0 [RouterB-Serial2/0] link-protocol x25 dte ietf [RouterB-Serial2/0] x25 x121-address 20 [RouterB-Serial2/0] x25 map ip 10.0.0.1 x121-address 10 broadcast [RouterB-Serial2/0] ip address 10.0.0.2 8 [RouterB-Serial2/0] quit
# Configure interface Loopback 1.
[RouterB] interface loopback 1 [RouterB-Loopback1] ip address 30.0.0.1 32 [RouterB-Loopback1] quit
# Configure RIP.
[RouterB] rip [RouterB-rip-1] network 10.0.0.0 [RouterB-rip-1] network 20.0.0.0 [RouterB-rip-1] network 30.0.0.0 [RouterB-rip-1] import-route direct