RE: EIGRP /IGRP

From: Volkov, Dmitry (Toronto - BCE) (dmitry_volkov@xxxxxxxxx)
Date: Thu Jul 18 2002 - 13:49:33 GMT-3

   
Hi Candidate,

I've just tried what You did - the result the same.
Karl Solie book (page 702):
Autosummarization will occur at the major class boundary
during redistribution from EIGRP into classful routing protocol, such as
IGRP or RIP.
This type of summarization CANNOT be disabled.

I did't find this at CCO, maybe somebody can point me for explanation "WHY
?"

Sincerely,

Dmitry Volkov

-----Original Message-----
From: ccie candidate [mailto:ccie1@lycos.com]
Sent: Thursday, July 18, 2002 10:05 AM
To: ccie candidate; ccielab@groupstudy.com; yakout esmat
Subject: RE: EIGRP /IGRP

Yakut ;
your first statement is right , redist between EIGRP and IGRP with the same
AS number should follow the same rules of redistribution ,the difference is
that it is done automatically .

your first rule is also right ,IGRP was not supposed to see the variable
subnets in the EIGRP domain ( and my question was why EIGRP summarized them
so that IGRP see them as for example /24 mask while they were /28 on the
EIGRP domain )

your 2) rule is wrong , auto summary is not meant for that , auto summary
will not allow the EIGRP router to send variably subnets from any major
class network

i didnt understand your last rule , however ip summary address command is to
summarize EIGRP domain to external protocols and not the other way around
-:)

now back to my question , WHY the routes appeard on the IGRP domain
summarized while i disable all summarization on EIGRP ?? 

--

On Thu, 18 Jul 2002 23:37:20
 yakout esmat wrote:
>Redistribution between EIGRP/IGRP using the same AS number follow the same
>rules as any normal redistribution between VLSM/FLSM.
>
>1) If both protocols using the same major nework but different masks, then
>IGRP will not see the networks with different subnets than its own.
>
>2) when you diable auto-summary in EIGRP, that only applies to routes
>redistributed from IGRP (or any other protocol) into EIGRP and not the
other
>way around.
>
>3) You can use the interface summary-address command if you wanted to send
>summary to next neighbor
>
>HTH
>
>Yakout
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>ccie candidate
>Sent: Thursday, July 18, 2002 10:30 PM
>To: ccielab@groupstudy.com
>Subject: EIGRP /IGRP
>
>
>guys ;
>i have a scenario where EIGRP and IGRP are having the same AS number and
>reditributing autmatically , the EIGRP domain have  different subnets
>(masks) .
>i disabled the auto-summary on all routers in eigrp domain including the
>redist point ,however the routers in IGRP domain can see all the routes in
>EIGRP domain as if EIGRP summarized them  .
>
>am i supposed to do this manually on EIGRP by using the summary address
>command ??? as per doyle vol 1 ?
>
>what am i missing here ?
>
>
>candidate
>
>

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