From: Fahad Khan (fahad.khan@gmail.com)
Date: Wed Aug 13 2008 - 05:15:39 ART
Dear Mark,
I posted regarding this query on19th july,08. This "distance" keyword in "ip
summary-address eigrp" command is used to modify the AD of the discard route
populated in the routing table when a router sends a summary route to its
neighbour and absolutely not for modifying the AD of the routes in
neighbour's routing table. consider this scenario,
1.1.1.1/24----(lo0)R1(s1/0)10.0.0.1-------10.0.0.2(s1/0)R2(s1/1)11.0.0.1-----11.0.0.2(s1/0)R3
|
(lo0)
1.1.2.1/24
-R1 is sending summary (1.0.0.0/8) to R2 through "ip summ-add" command
-R1 will have discard route to null0 in its routing table
-R2 gets this summary with AD of 90 from R1 ( as its normal eigrp update for
R2's perception)
-if R2 needs to generate summary route(1.0.0.0/8) towards R3 through "ip
summ-add" command, then here comes a conflit, R2 will create discard route
entry in its routing table for 1.0.0.0/8 since it has deafilt AD of 5 and
that will suppress the summary update got from R1. In order to prevent this
behaivour , increase the AD of summary route more than 90 when configuring
on R2 for R3. Then , R2 wont be having any discard route in its routing
table and R3 will be having a summary in its routing table as 1.0.0.0/8 and
will be able to ping 1.1.2.1 and 1.1.1.1.
-This is how we can play with discard route through modifing AD.
HTH
On 8/13/08, Mark Stephanus Chandra <mark.chandra@gmail.com> wrote:
>
> Hi Hong,
>
> The problem is, The Distance is not propagated to the neighbor router.
>
> Just like I said, whatever your distance is, the AD on your neighbor would
> still the same, which is 90
>
> On Wed, Aug 13, 2008 at 12:54 PM, Hong Chan <howard.chan34@gmail.com>
> wrote:
>
> > For my understanding, the distance is used if you 2 router doing
> > summarization and you don't want to load balance them. you can adjust 1
> of
> > the summary route to be larger than 90 on 1 of the routers which perform
> the
> > summarization. Then the router should only have 1 summary route, which is
> > learned from another summary router.
> > Please correct me if I am wrong
> > 2008/8/13 Mark Stephanus Chandra <mark.chandra@gmail.com>
> >
> >> Hi expert,
> >>
> >>
> >>
> >> I'm wondering about EIGRP summarization,
> >>
> >>
> >>
> >> IP summary address eigrp 200 192.168.10.0 255.255.255.0 160
> >>
> >>
> >>
> >> The distance value seems don't do anything.
> >>
> >>
> >>
> >> I check in my neighboring router, I have the eigrp summarization route
> >> with
> >> AD 90 (Internal).
> >>
> >>
> >>
> >> So what the distance is for in eigrp summarization
> >>
> >>
> >>
> >> Thanks
> >>
> >>
> >>
> >> Regards
> >>
> >>
> >>
> >> Mark Stephanus Chandra
> >> IT Consultant
> >>
> >>
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> >>
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> >>
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> >>
> >>
> >
>
>
> --
> Mark Stephanus Chandra
> IT Consultant
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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-- *FAHAD KHANBE Computer Systems NED,
CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE (Written)
Systems Support Engineer, Premier Systems (Pvt) limited,
Karachi, Pakistan
92-321-2370510.*
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