Re: "AD on IP summary Address in Eigrp"

Joe,
If the router has a more specific route than the summary, the more specific
route will be used. That traffic will not get blackholed by Null0.
Also called longest match.

Ron

On Sat, Jul 28, 2012 at 1:43 PM, Joe Sanchez <marco207p_at_gmail.com> wrote:

> What you need to watch out for when you create the (eigrp summary route)
> on your routers is that a NULL0 route will be created on that same router
> or switch, this being said even if your router has a more specific route
> the NULL0 route will blackhole any traffic that falls within that
> summary-range.
>
> Joe Sanchez
>
>
>
>
> On 7/28/12 11:53 AM, "Jay McMickle" <jay.mcmickle_at_yahoo.com> wrote:
>
> >Not really sure what you are asking, but EIGRP summary will always have
> >an AD. It defaults to 5, but it can be modified.
> >
> >Can you rephrase your question?
> >
> >Regards,
> >Jay McMickle- CCIE #35355 (RS), 3x CCNP (RS,Security,Design)
> >Sent from my iPhone
> >
> >On Jul 28, 2012, at 5:15 AM, "ccie.butcher" <ccie.butcher_at_gmail.com>
> >wrote:
> >
> >> Is there always necessary to add an AD value (less than 90) while
> >> configuring manual summarization in EIGRP by the command - ip
> >> summary-address eigrp <AS no> <Ip addr> <Mask> <AD> or it is only
> >>required
> >> when we are doing the manual summarization of same ip addresses on
> >> different routers in order to avoid the reception of summary
> >>advertisement
> >> of same address from different routers.
> >>
> >> --
> >> Thanks and Regards
> >>
> >>
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Received on Sat Jul 28 2012 - 14:25:22 ART