Dynamic route backup configuration example 4
Network requirements
As shown in Figure 61, Router A and Router B are connected through an FR network. They are also connected through an ISDN switched network, enabling them to call each other. The telephone number of Router A is 660330, and that of Router B is 660220.
Use Router A as the master device of a dynamic route backup group to monitor three network segments 10.0.0.1/8, 11.0.0.1/8, and 12.0.0.1/8, which are all connected to Router B.
The FR link functions as the primary link between Router A and Router B. When the routes to all the three network segments become invalid, Router A automatically establishes an ISDN BRI link to Router B.
Figure 61: Network diagram
This network diagram only illustrates a simple application where a dynamic route backup group is used to monitor multiple subnets. In actual use, the monitored network segments can be connected to multiple devices.
Configuration procedure
Configure Router A:
# Create a dialer access group rule.
<RouterA> system-view [RouterA] dialer-rule 1 ip permit
# Create a dynamic route backup group to monitor three network segments.
[RouterA] standby routing-rule 1 ip 10.0.0.0 255.0.0.0 [RouterA] standby routing-rule 1 ip 11.0.0.0 255.0.0.0 [RouterA] standby routing-rule 1 ip 12.0.0.0 255.0.0.0
# Bundle timeslots on the CE1 interface into a PRI group.
[RouterA] controller e1 2/1 [RouterA-E1 2/1] pri-set [RouterA-E1 2/1] quit
# Configure Serial 2/0 as an FR interface.
[RouterA] interface serial 2/0 [RouterA-Serial2/0] ip address 1.0.0.1 255.0.0.0 [RouterA-Serial2/0] link-protocol fr [RouterA-Serial2/0] fr interface-type dte [RouterA-Serial2/0] fr inarp [RouterA-Serial2/0] fr map ip 1.0.0.2 100 [RouterA-Serial2/0] quit
# Configure C-DCC on the PRI interface.
[RouterA] interface serial 2/1:15 [RouterA-Serial2/1:15] ip address 2.0.0.1 255.0.0.0 [RouterA-Serial2/1:15] dialer enable-circular [RouterA-Serial2/1:15] dialer-group 1 [RouterA-Serial2/1:15] dialer route ip 10.0.0.0 mask 8 660220 [RouterA-Serial2/1:15] standby routing-group 1 [RouterA-Serial2/1:15] quit
# Configure RIP.
[RouterA] rip [RouterA-rip-1] network 1.0.0.0 [RouterA-rip-1] network 2.0.0.0 [RouterA-rip-1] import-route direct
# Configure the routes used by the serial interface to adopt higher priorities than those used by the dialup interface.
[RouterA] interface serial 2/1:15 [RouterA-Serial2/1:15] rip metricin 2
Configure Router B:
# Create a dialer access group rule for dialup.
[RouterB] system [RouterB] dialer-rule 1 ip permit
# Bundle timeslots on the CE1 interface into a PRI group.
[RouterB] controller e1 2/1 [RouterB-E1 2/1] pri-set [RouterB-E1 2/1] quit
# Configure Serial 2/0 as an FR interface.
[RouterB] interface serial 2/0 [RouterB-Serial2/0] ip address 1.0.0.2 255.0.0.0 [RouterB-Serial2/0] link-protocol fr [RouterB-Serial2/0] fr interface-type dte [RouterB-Serial2/0] fr inarp [RouterB-Serial2/0] fr map ip 1.0.0.1 200 [RouterB-Serial2/0] quit
# Configure C-DCC on PRI interface Serial 2/1:15.
[RouterB] interface serial 2/1:15 [RouterB-Serial2/1:15] ip address 2.0.0.2 255.0.0.0 [RouterB-Serial2/1:15] dialer enable-circular [RouterB-Serial2/1:15] dialer-group 1 [RouterB-Serial2/1:15] dialer route ip 2.0.0.1 mask 8 660330 [RouterB-Serial2/1:15] quit
# Configure the Ethernet interfaces with the network segments attached.
[RouterB] interface ethernet 1/0 [RouterB-Ethernet1/0] ip address 10.0.0.1 255.0.0.0 [RouterB-Ethernet1/0] quit [RouterB] interface ethernet 1/1 [RouterB-Ethernet1/1] ip address 11.0.0.1 255.0.0.0 [RouterB-Ethernet1/1] quit [RouterB] interface ethernet 1/2 [RouterB-Ethernet1/2] ip address 12.0.0.1 255.0.0.0 [RouterB-Ethernet1/2] quit
# Configure RIP.
[RouterB] rip [RouterB-rip-1] network 1.0.0.0 [RouterB-rip-1] network 2.0.0.0 [RouterB-rip-1] network 10.0.0.0 [RouterB-rip-1] network 11.0.0.0 [RouterB-rip-1] network 12.0.0.0 [RouterB-rip-1] import-route direct