3Com 3C13636 Configuration Manual page 1479

3Com Router 3000 Ethernet Family
Configuration Guide
[RouterB] interface Serial1/0/0:15
[RouterB-Serial1/0/0:15] ip address 2.0.0.2 255.0.0.0
[RouterB-Serial1/0/0:15] dialer enable-circular
[RouterB-Serial1/0/0:15] dialer-group 1
[RouterA-Serial1/0/0:15] dialer route ip 2.0.0.1 mask 8 660330
[RouterB-Serial1/0/0:15] quit
# Configure Ethernet interfaces.
[RouterB] interface ethernet3/0/0
[RouterB-Ethernet3/0/0] ip address 10.0.0.1 255.0.0.0
[RouterB-Ethernet3/0/0] quit
[RouterB] interface ethernet4/0/0
[RouterB-Ethernet4/0/0] ip address 11.0.0.1 255.0.0.0
[RouterB-Ethernet4/0/0] quit
[RouterB] interface ethernet5/0/0
[RouterB-Ethernet5/0/0] ip address 12.0.0.1 255.0.0.0
[RouterB-Ethernet5/0/0] quit
# Configure RIP.
[RouterB] rip
[RouterB] network 1.0.0.0
[RouterB-rip] network 2.0.0.0
[RouterB-rip] import-route direct
When fault occurs on the frame relay network, routes to the segments 10.0.0.1/8,
11.0.0.1/8, and 12.0.0.1/8 disappear on Router A. Then, the system dials to bring up
the backup ISDN PRI link according to the dialer route ip 10.0.0.0 mask 8 660220
command.
The dialer route command does not add routes to the routing table. Instead, the
system uses it only when sending a packet from the dial interface to determine which
number is to be dialed based on the destination address of the packet. After the backup
dial-up link is connected, Router A can learn routes to the three network segments. You
can see them by executing the display ip routing command.
When configuring Router A, note the following:
The IP addresses configured using the standby routing-rule command must be
included in the IP address configured using the dialer route command.
On the PRI interface, you only need to configure one dial-up route for the
monitored network segments. In this scenario, it is dialer route ip 10.0.0.0 mask
8 660220. Even you configure multiple dial-up routes, only the first one can take
effect.
This scenario is simplified. In practice, the monitored segments may distribute on
multiple devices.
3Com Corporation
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Chapter 2 Dynamic Routing Standby