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?
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>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.
<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]
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