From: Jung-I Lin (easyman.lin@gmail.com)
Date: Fri Oct 06 2006 - 21:47:15 ART
Hi,
I think the suggestion from cisco is for real networks not for our Lab
attempt.
It really depend on waht the lab is asking for in the exam.
In my lab practicing, I use "summary-address" more than "redistribute
static(default static route)".
If you want to avoid seeing the discard-route(Null0 entry), you can use the
command with AD of 255.
With this you can still advertise a default-route to neighbor, but not
install the null0 route in local routing table.
On 10/2/06, Skinner, Stephen <Stephen.Skinner@rbs.co.uk> wrote:
>
> 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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-- Thanks Best Regards,Jung-I Lin
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