From: louie kouncar (lkouncar@xxxxxx)
Date: Fri May 11 2001 - 18:48:16 GMT-3
Mohamed,
If the network you want to summarize is connected to the router, then
redistribute connected with an access list that will allow only that network
to be redistributed, at this time, you will have an LSA 5 to that network
and you can then use the summary-address command to advertise it to your
IGRP neighbor which will accept it......
Louie J. Kouncar
TCO3 Senior Data Center Engineer
UUNET
W-703-343-6645
C-703-304-2460
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Mohamed Heeba
Sent: Friday, May 11, 2001 5:17 PM
To: 'Johnny Dedon'
Cc: ccielab@groupstudy.com
Subject: RE: Fatkid lab 502 ,expert redistribution
ok ;
HOW to summarize 22 subnet in the OSPF domain to be advertise in 24 mask
IGRP one ,
the 22 is directly attached to the redistribution router ,only one area is
there ,area range command didnt work i mean
thx
> -----Original Message-----
> From: Johnny Dedon [SMTP:johnny.dedon@exodus.net]
> Sent: Friday, May 11, 2001 1:54 PM
> To: Johnny Dedon; Mohamed Heeba
> Cc: ccielab@groupstudy.com
> Subject: Re: Fatkid lab 502 ,expert redistribution
>
> Correction on summary route.
> I spoke too soon on the summary route.
> The summary route can be created within OSFP for redistribution into an
> external routing protocol. If you want a summary to appear in ospf then
> it
> must be created from routes external to the OSPF process or it must be
> created using the area range command where it can only be seen by routers
> belonging to areas other than the area it is advertised from.
>
> HTH
> Johnny Dedon
> Senior Staff Consultant
> Exodus Professional Services
> johnny.dedon@exodus.net
> www.exodus.net
> ----- Original Message -----
> From: "Johnny Dedon" <johnny.dedon@exodus.net>
> To: "Mohamed Heeba" <MAHeeba@itqan.co.ae>
> Cc: <ccielab@groupstudy.com>
> Sent: Friday, May 11, 2001 3:37 PM
> Subject: Re: Fatkid lab 502 ,expert redistribution
>
>
> > Mohamed,
> > Responses inline
> > Johnny Dedon
> > Senior Staff Consultant
> > Exodus Professional Services
> > johnny.dedon@exodus.net
> > www.exodus.net
> > ----- Original Message -----
> > From: "Mohamed Heeba" <MAHeeba@itqan.co.ae>
> > To: "'Johnny Dedon'" <johnny.dedon@exodus.net>; "Mohamed Heeba"
> > <MAHeeba@itqan.co.ae>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Friday, May 11, 2001 3:12 PM
> > Subject: RE: Fatkid lab 502 ,expert redistribution
> >
> >
> > > well;
> > > i think things are more difficult than this ..let me share my ideas
> here
> > > i agree that the OSPF summary command is used to summarize the
> external
> > > routes INTO the OSPF domain ,however in some solutions out there ,it
> is
> > used
> > > to summarize the OSPF itself to other protocols like IGRP ,but this
> will
> > > work only if the subnets of the OSPF domain can be summarized at the
> IGRP
> > > subnet boundary ,also the summary route will be propagated into the
> OSPF
> > YOU HAVE TO HAVE A ROUTE TO CREATE THAT SUMMARY WITH AND IT MUST BE
> EXTERNAL
> > TO OSPF
> > > domain as E2 route which i wasnt able to filter it at all(or it will
> aslo
> > > disapear from the IGRP !!)
> > > wat u explained about the route feedback is another problem called
> black
> > > holes ( i hope im right in this ) ]
> > WHAT I TRIED TO EXPLAIN IS THE OSPF ROUTE WITH AN ADMINISTRATIVE
> DISTANCE
> OF
> > 110 GETS DISTRIBUTED INTO IGRP WHERE IT GETS AND ADMINISTRATIVE DISTANCE
> OF
> > 100. IF MUTUAL REDISTRIBUTION IS TAKING PLACE THEN THIS ROUTE WILL BE
> > REDISTRIBUTED BACK TO OSPF WHERE THE ROUTER WILL SEE THAT THIS ROUTE
> COMING
> > FROM IGRP HAS A LOWER ADMIN DISTANCE THAN THAT OF THE OSPF ROUTES AND
> > THEREFORE USE THIS ROUTE IN IT'S TABLE. IF YOU DO A SHOW IP ROUTE, THEN
> ALL
> > OF THE OSPF ROUTES THAT WERE DISTRIBUTED INTO IGRP AND THEN BACK WILL BE
> > LISTED AS E2. ANOTHER NOTE HERE IS THAT IN SOME CASES SPLIT HORIZON
> WILL
> > NOT ALLOW THE ROUTES BACK OUT OF IGRP SO THIS FEEDBACK DOES NOT OCCUR.
> > > where the routes of less admin distance will replace those of higher
> ones
> > > and the routes will stuck in one domain ...this problem will only
> happen
> > if
> > > u have TWO points of redistribution .
> > > AS per doyle , route feedback will happen when u have one point of
> > > redistribution and u do mutual redistribution from two domain one to
> the
> > > other ...doyle required to put filter in each domain to prevent this
> > > ....while without the filter things work fine with me ...that is why
> im
> > > confused ???
> > >
> > > DO I HAVE TO PUT FILTERS IF ONLY 1 REDISTRIBUTION ROUTER AND MUTUAL
> REDIST
> > > IS THERE ?? OR I NEED ONLY THIS WHEN I HAVE TWO POINTS OF REDIST.
> >
> > IT IS GOOD PRACTICE TO FILTER ROUTES ANY TIME MUTUAL REDISTRIBUTION
> OCCURS.
> > IT IS ONLY NECESSARY WHEN REDISTRIBUTING FROM A HIGHER ADMIN COST TO A
> LOWER
> > ADMIN COST .
> > > secondly ,i didnt find anyway to summarize the OSPF 22 masks into the
> IGRP
> > > 24 domain without using either static routes or the summary address
> and
> > let
> > > the summary route propagate back to the OSPF domain ...
> > >
> > > any more ideas guys
> > > > -----Original Message-----
> > > > From: Johnny Dedon [SMTP:johnny.dedon@exodus.net]
> > > > Sent: Friday, May 11, 2001 1:01 PM
> > > > To: Mohamed Heeba
> > > > Subject: Re: Fatkid lab 502 ,expert redistribution
> > > >
> > > > Mohamed,
> > > > The summary route is used to summarize routes external to the ospf
> > process
> > > > for reditribution into the OSPF process. Have you looked at
> changing
> > the
> > > > mask on the link between igrp and ospf to a 22 bit mask ? Or have
> you
> > > > looked at sending a default route into igrp. Route feedback occurs
> when
> > > > you
> > > > redistribute ospf routes into igrp and since igrp has a lower admin
> and
> > > > the
> > > > routes are now igrp routes they get advertised back to the
> > redistributing
> > > > router where they get put in the route table as ospf external
> routes.
> > Get
> > > > it, they WERE ospf internal routes until you redistributed them to
> igrp
> > > > and
> > > > they got redistributed back. You should not allow this to happen.
> Use
> > > > route-maps or distribute list to stop this.
> > > > Johnny Dedon
> > > > Senior Staff Consultant
> > > > Exodus Professional Services
> > > > johnny.dedon@exodus.net
> > > > www.exodus.net
> > > > ----- Original Message -----
> > > > From: "Mohamed Heeba" <MAHeeba@itqan.co.ae>
> > > > To: <ccielab@groupstudy.com>
> > > > Sent: Friday, May 11, 2001 1:45 PM
> > > > Subject: Fatkid lab 502 ,expert redistribution
> > > >
> > > >
> > > > > guys ;
> > > > > i have a problem here which is similar to some post was here very
> > > > soon...
> > > > > it is regarding the redist of the OSPF into the IGRP ,here is my
> notes
> > > > and
> > > > > questions
> > > > > the case is :
> > > > > the ospf is having different masks of the network 135.1.x.x ,the
> masks
> > > > are
> > > > > /22
> > > > > ,/24,28 while the IGRP is only 24
> > > > > now i didnt get a clear answer about this question
> > > > > 1-does the summary address of the OSPF used to summarize the OSPF
> > domain
> > > > to
> > > > > other protocols or it is ONLY used to summarize the other
> protocols
> > > > domains
> > > > > into the OSPF ??
> > > > > i noticed that the summary address will NOT work until u redist
> IGRP
> > > > into
> > > > > the ospf process even before u redist the OSPF into the IGRP
> > > > >
> > > > > 2- how to redist the mask 22 in the IGRP ? it is not normal to
> > summarize
> > > > > this mask at the 24 boundary (i know this can be done to solve the
> > lab )
> > > > but
> > > > > the problem is that the OSPF will create a static route to the
> null0
> > in
> > > > the
> > > > > redist router and this will take all the traffic to null0 (since
> 24
> is
> > > > more
> > > > > specific than the 22 in teh routing table
> > > > >
> > > > > 3- is the solution for this problem by using the area range
> command
> > > > > somewhere in teh OSPF domain
> > > > >
> > > > > 4-can someone define how the route feedback can heppen ?? becaue
> when
> > i
> > > > > tried to filter in the ospf domain the routes (to accept those
> only
> > > > coming
> > > > > from OSPF and not IGRP ,)teh summary disappeared from the route
> table
> > as
> > > > if
> > > > > it is coming from the IGRP
> > > > > i want to understand this point "is the route feedback means that
> the
> > > > > routes goes inside the domain to downstream routers and then come
> back
> > > > ,or
> > > > > it is only comes back on the redistribution router "
> > > > >
> > > > >
> > > > > i hope someone is patient to answer all this :)
> > > > > thx
> > > > > **Please read:http://www.groupstudy.com/list/posting.html
> > **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:30:40 GMT-3