Problem solve Get help with specific problems with your technologies, process and projects.

How can I configure my router so that if one of my two DSL lines goes down, the other line will take

I have two DSL lines and one Cisco router with two Ethernet interfaces. How can I configure the router so that if one of the lines goes down, the other will take over?
There are a few different ways to handle this.

One option you have is to create a floating static route for the same destination with a higher metric. For example:

Ip route eth0
Ip route eth1 50

The second serves as a floating static route and will be activated only if eth0 goes down.

Another solution is to use a backup interface command under eth0. (i.e. "backup interface eth1"). It will then activate if eth0 goes down.

Another option is to use a dynamic routing protocol. However, this can only be done if your DSL service provider agrees to it.

This was last published in June 2004

Dig Deeper on Network Infrastructure

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.