From: marius@aict.co.za
Date: Thu Mar 09 2006 - 05:01:29 GMT-3
Has anyone actually tested this solution by not shutting interface serial 1/0.1 on R5?
As far as I am aware of one cannot use the backup interface command on frame-relay interfaces.
The solutions guide indicates backup interface as a solution and it works fine by putting the serial line into standby.
Up to this point all is well.
If you however disable R3s serial 1/1.1 interface you will notice that the backup interface does not "kick in"
The reason for this is that interface serial 1/0.1 on R5 will remain up.
There is no trigger on frame-relay to indicate that the line is down since local LMI's are used to keep the line up.
EIGRP realizes this and drops all the routes but since the backup interface is in Standby mode no new adjacencies can be formed.
A route-map with "set ip next hop x.x.x.x" will also not work for the same reason.
As long as your next hop is valid, witch it will be, the traffic will be sent to this "broken" link
The only answer I can see is to use a floating static.
When you actually make the frame-relay the backup interface for the serial all works fine.
Any comments or other solutions that fits the questionnaire will be appreciated?
PS: If one shuts the interface locally things do work as the trigger is local.
There is no backup interface configured on router 3 and thus routing adjacencies are formed when the backup link is brought out of standby.
Marius Venter
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