While I haven't set this scenario up in production, I have played with a simlar
configuration in my home lab using async dial backup. I configured the async interface
with a dialer watch-group and (of course) a matching dialer watch-list for the desired
subnet. (The dialer-watch monitors the routing table for the specified route(s) and
kicks off the dialer if this route disappears (i.e. the primary connection fails)). To
keep the EIGRP hello's from keeping my link up I used the a dialer-list commands which
referenced an extended access-list similar to the following:
int async 1
dialer-group 1
dialer-list 1 protocol ip list 100
access-list 100 deny eigrp any any
access-list 100 permit ip any any
Remember the dialer-list specifies interesting traffic and *not* what traffic is
actually allowed to cross the link. Once the dialer watch-group brings up the link the
EIGRP hellos will be allowed and the routers should establish neighbor relationships.
One thing to remember is that your dialer map statement should reference the subnet
that
you are watching. There is also a "dialer watch-disable" that lets you specifiy how
the
primary link must be up before the dial-backup connection is dropped. You may want to
search the archives for the CCIELAB mailing list .. there is some excellent information
relating to EIGRP and ISDN there.
Hope this helps,
Sandy Turnage
whitaker wrote:
> So here's the scenario...Numerous routers in a central site connected to
> other remote sites via frame-relay with backup ISDN. Question: What is the
> best way to implement EIGRP in this scenario? My thoughts were to run EIGRP
> over the frame, set up the dialer interface / bri as a passive interface,
> and use floating static routes (static route with higher administrative
> distance for ISDN backup)
>
> Thoughs, comments, suggestions, ridicules? ;-)
>
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