Filter
Top Products
6-3
Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
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-list group-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>