Cisco Systems OL-6426-02 manual Dial Backup Feature Limitations, 13-5

Chapter 13 Configuring Dial Backup and Remote Management

Dial Backup Feature Limitations

	Command		Purpose
Step 5	ip route prefix mask {ip-address interface-type		Assigns the lower routing administrative distance
	interface-number [ip-address]} [distance]		value for the backup interface route. 192.168.2.2
			is the peer IP address of the backup interface.
	Example:
	Router(config)# ip route 0.0.0.0 0.0.0.0
	192.168.2.2	150
	Router(config)#
Step 6
	dialerwatch-listgroup-number {ip ip-address		Assigns an IP address to the watch list.
	address-maskdelay route-check initial		If the connection on the primary interface is lost
	seconds}
			and the IP address is unavailable on the router, the
	Example:		dial-out feature on the backup interface is
			triggered. 22.0.0.2 is the peer IP address of the
	Router(config)# dialer watch-list 2 ip		primary interface.

22.0.0.2255.255.255.255

Router(config)#

Dial Backup Feature Limitations

The following limitation exists for the dial backup feature: bridging is not supported over console or auxiliary port backup interfaces.

Table 13-1summarizes dial backup support and limitations for the Cisco 1800 series integrated services fixed-configuration routers.

Table 13-1 Dial Backup Feature Support and Limitations Summary

WAN Encapsulation	Dial Backup
Type	Possible?	Dial Backup Method	Limitations
Cisco 1811 or Cisco 1812
PPPoE	Yes	Dialer watch	Bridging is not supported across a slow interface, for
			example, an auxiliary port. The peer IP address of the ISP is
			needed to configure the dialerwatch command and the IP
			static route.
Normal IP in cable	No	Dialer watch	The IP addresses of the peers are needed for dialer watch to
modem scenario			work properly. If a lease time obtained by DHCP is not set
			short enough (1 or 2 minutes), dial backup is not supported.

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

OL-6426-02 13-5