[nsp] Proper way of doing dial backup for an ethernet(DSL) link

[Krzysztof Adamski]

I have a DSL link that is terminated as an Ethernet connection, I would
like to setup a dialup failover for it. Since it is an Ethernet I can't
watch the physical interface.
I have a cisco 1721 on the remote end.

One way is to run BGP between the two points and then to "watch" a route.

But what is the best way of doing this, I have full control of both ends,
but at the same time I want to protect the central point from the remote.

K