From: Skinner, Stephen (Stephen.Skinner@rbs.co.uk)
Date: Mon Oct 02 2006 - 06:07:27 ART
Hello,
I have taken the following excerpt from the 12.4 guide's on the CCO.
I have added my comments in .
You should not use the ip summary-address eigrp summarization command to
generate the default route (0.0.0.0) from an interface. (OK no problem)
This causes the creation of an EIGRP summary default route to the null 0
interface with an administrative distance of 5.(Yep , I have seen it happen)
The low administrative distance of this default route can cause this route
to displace default routes learned from other neighbours from the routing
table.
(i.e. other routing protocol's.)
If the default route learned from the neighbours is displaced by the summary
default route, or if the summary route is the only default route present,
all traffic destined for the default route will not leave the router,
instead, this traffic will be sent to the null 0 interface where it is
dropped.
(yep I get it )
The recommended way to send only the default route out a given interface is
to use a distribute-list command. You can configure this command to filter
all outbound route advertisements sent out the interface with the exception
of the default (0.0.0.0).
OK . My question .
With the summ-address command It actually creates the default as well as
sending it out.
So What is the preferred method of creating a Default route in eigrp ? .
I cant use the "default-information" command as it only effect's if E will
receive the default , not how to create it.
If I cant use the summary-address how else can I create the default.?
TIA
Stephen Skinner
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