From: Mohamed Heeba (MAHeeba@xxxxxxxxxxx)
Date: Tue May 15 2001 - 14:38:03 GMT-3
well
i reached the policy routing trick to be a good tool to bypass the no static
allowed rule
about the not-advertise option ..i didnt see it before ..looks like a good
tool to be tested
thx
> -----Original Message-----
> From: Mannan Venkatesan [SMTP:venkat_m@ins.com]
> Sent: Monday, May 14, 2001 11:39 AM
> To: Mohamed Heeba
> Cc: ccielab@groupstudy.com
> Subject: Re: Fatkid lab 502 ,expert redistribution
>
> I have done this before. I used policy routing to bypass /24 null0. And I
> used 'not-advertise' option with summary-address to prevent the EX route
> propagated to the OSPF domain. I found, with 'not-advertise' command, OSPF
> domain routers will have the EX route in their OSPF database but not in
> their routing table.
>
> HTHs
> Mannan
>
> ----- Original Message -----
> From: "Mohamed Heeba" <MAHeeba@itqan.co.ae>
> To: <lkouncar@UU.NET>
> Cc: <ccielab@groupstudy.com>
> Sent: Friday, May 11, 2001 5:59 PM
> Subject: RE: Fatkid lab 502 ,expert redistribution
>
>
> > 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
> > > **Please read:http://www.groupstudy.com/list/posting.html
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