Cisco Systems C819HG4GVK9 Configuring Cellular Dial-on-Demand Routing Backup, configure terminal

Chapter 6 Configuring Backup Data Lines and Remote Management

Configuring Cellular Dial-on-Demand Routing Backup

Configuring Cellular Dial-on-Demand Routing Backup

To monitor the primary connection and initiate the backup connection over the cellular interface when needed, the router can use one of the following methods:

•Backup Interface—The backup interface that stays in standby mode until the primary interface line protocol is detected as down and then is brought up. See the “Configuring Backup Interfaces” section on page 6-1.

•Dialer Watch—Dialer watch is a backup feature that integrates dial backup with routing capabilities. See the “Configuring DDR Backup Using Dialer Watch” section on page 6-3.

•Floating Static Route—The route through the backup interface has an administrative distance that is greater than the administrative distance of the primary connection route and therefore would not be in the routing table until the primary interface goes down. When the primary interaface goes down, the floating static route is used. See the “Configuring DDR Backup Using Floating Static Route” section on page 6-5

Note You cannot configure a backup interface for the cellular interface and any other asynchronous serial interface.

Configuring DDR Backup Using Dialer Watch

To initiate dialer watch, you must configure the interface to perform dial-on-demand routing (DDR) and backup. Use traditional DDR configuration commands, such as dialer maps, for DDR capabilities. To enable dialer watch on the backup interface and create a dialer list, use the following commands in interface configuration mode.

SUMMARY STEPS

1.configure terminal

2.interface type number

3.dialer watch group group-number

4.dialer watch-listgroup-number ip ip-address address-mask

5.dialer-list<dialer-group>protocol <protocol name> {permit deny list <access list number> access-group}

6.ip access-list<access list number> permit <ip source address>

7.interface cellular 0

8.dialer string <string>

Cisco 819 Series Integrated Services Routers Software Configuration Guide

OL-23590-02 6-3