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Configuring main and backup leased lines

I have two leased lines from two different exchanges. I need to configure both these lines in one router (2600), which has four serial and one Ethernet interfaces. My aim is to have a backup line so that when one line goes down, the traffic should go through other leased line.

Do I have to configure the same administrative distance on both ends of the redundant line or on just one end of the leased line?

If the direction of traffic was one way, then adding a static router with a higher metric on one side of your connection would be adequate. But, because I believe this is highly unlikely, you'll need one static route on each end of your leased line with a metric higher than that of the main line.

For example, if we assume that serial 0 is your main backup leased line and serial 1 is the redundant leased line, then this is what we would enter:

Router1
Ip route <router2 network> <subnetmask>
<next hop-main line> 1 [main line, with metric = 1] Ip route <router2 network> <subnetmask> <next hop-backup line>
100 [backup line, with metric = 100] Router2 Ip route <router1 network> <subnetmask> <next hop-main line> 1
[main line, with metric = 1] Ip route <router1 network> <subnetmask> <next hop-backup line> 100
[backup line, with metric = 100]
On the other hand, you can use a routing protocol that will automatically switch to the backline, but I'd stick to the static route entries, since we are talking about two leased lines.
This was last published in April 2005

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