From: Mohamed Heeba (MAHeeba@xxxxxxxxxxx)
Date: Fri May 11 2001 - 18:59:45 GMT-3
let me understand this please ,i have read the post and the guys was talking
about the same thing
let me explain wat is in that damn lab
----IGRP/24--------R4---------OSPF/22-------R2------OSPF/24
the redistribution should be done on R4 in both direction
on the ospf process ,i created the summary address of the 22 mask to be as
24 (which is weird ..but ok )
the OSPF process created a static route to the null0 into the routing table
(not appeared in the configuration )
the route (/24) propagated to the IGRP as well as to the OSPF domain without
problems
when the IGRP internal routes tried to ping the OSPF 22 network , it didnt
work ???? because R4 null0 take the traffic ....i have tried to change the
22 to 26 mask and in that case it worked fine .
so ,now u can tell me wat redistribute connected can do in this case and
where do u want to put it ?
another thing when i tried it with 26 mask ,the summary propagated to the
OSPF domain ,i didnt find anyway to filter it ,if i do it will NOT go the
IGRP domain as well.........
any suggestion ?
> -----Original Message-----
> From: louie kouncar [SMTP:lkouncar@UU.NET]
> Sent: Friday, May 11, 2001 2:48 PM
> To: 'Mohamed Heeba'; 'Johnny Dedon'
> Cc: ccielab@groupstudy.com
> Subject: RE: Fatkid lab 502 ,expert redistribution
>
> 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
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