Example for Configuring Dynamic Route Backup to Implement IP Network Backup on the ISDN

Created: Dec 17, 2016 23:26:27Latest reply: Dec 26, 2016 16:50:46 968 1 0 0

Applicability

This example applies to all versions and all AR routers except AR150/200.


Networking Requirements

As shown in Figure 1,RouterA functions as the gateway of the branch, and RouterB functions as the gateway of the headquarters.

The IP network provides the primary communication path for the headquarters and branch.

The integrated services digital network (ISDN) provides the backup link for the headquarters and branch.

The access codes of the branch and headquarters are 660220 and 660210 respectively.

RouterA monitors the status of the route to 10.1.2.0/24 (headquarters). When the primary link becomes unavailable, RouterA uses the backup dial-up link.

Figure 1 Networking diagram of dial-up backup
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Procedure

  1. Configure RouterA.

  2. Configure RouterB.

  3. Configure RouterC and RouterD.

    For details, see the OSPF configuration on RouterA and RouterB. Ensure that RouterA and RouterB have reachable routes to each other.

  4. Verify the configuration.

    Check the routing table on RouterA. When the primary route is reachable, the outbound interface of the route to 10.1.2.0/24 is Ethernet2/0/0, and no data traffic is transmitted on dialup interface Serial1/0/0:15.

    When the primary route is unreachable, the outbound interface of the route to 10.1.2.0/24 is Serial1/0/0:15, and data traffic is transmitted on dialup interface Serial1/0/0:15.

Configuration Notes

  • The AR supports a maximum of 255 standby routing groups and each group contains only one network segment.
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  • convention:

user_2790689     Created Dec 26, 2016 16:50:46 Helpful(0) Helpful(0)

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