From: ccie1101 (ccie1101@gmail.com)
Date: Mon Oct 29 2007 - 12:06:49 ART
Joe,
I don't think you understand my question ..... The null0 carries the
summary-address network back to ospf. Therefore the x.x.0.0/16 address is
going back to the OSPF domain which it not needed. This is a conceptual
question which I want to clarify ....
Can an expert help clarfiy my query if when I redistriute eigrp which
has a summary-address of the POD with a /16 into OSPF, do I need to use a
route-map to deny this eigrp summary-address when it goes to OSPF ?
Thanks in advance,
cheers,
ccie1101.
On 10/27/07, Joseph Saad <joseph.samir.saad@gmail.com> wrote:
>
> What do you mean by "Nothing breaks without it"?
>
> What is the value of NOT redistributing a Null route and what are you
> expecting to achieve out of it?
>
> What is the outcome on the other routers. My believe is that it has no
> significance whatsoever as by default the Null0 interface isn't
> redistributed when you redistribute eigrp 20 into ospf 1.
>
> Can I get the full config of router ospf 1 and eigrp 20 along with their
> neighbors?
>
> On 10/26/07, ccie1101 < ccie1101@gmail.com> wrote:
> >
> > So do I need to do the following ? It looks like nothing breaks without
> > > it but the summary-address will be all over the POD.
> > >
> >
> > Pls advice,
> >
> >
> > ------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > router ospf 1
> > redistribute eigrp 20 subnets route-map DENY_NULL
> > !
> > route-map DENY_NULL deny 10
> > match int null0
> > !
> > !
> > route-map DENY_NULL permit 20
> >
> >
> > ------------------------------------------------------------------------------------------------------------------------------------------------------------------
> >
> > ccie1101.
> >
> > On 10/27/07, Joseph Saad <joseph.samir.saad@gmail.com > wrote:
> > > >
> > > > My mistake. overlooked the permit 20 line.
> > > >
> > > > On 10/26/07, ccie1101 <ccie1101@gmail.com> wrote:
> > > > >
> > > > > The connected routes are distributed into ospf as I can see those
> > > > > routes ..... As the route-map does a match on interface null0 only ..... Why
> > > > > do you say that the connected routes are not redistributed with this set of
> > > > > commands ?
> > > > >
> > > > >
> > > > > router ospf 1
> > > > > redistribute eigrp 20 subnets route-map DENY_NULL
> > > > > !
> > > > > route-map DENY_NULL deny 10
> > > > > match int null0
> > > > > !
> > > > > !
> > > > > route-map DENY_NULL permit 20
> > > > >
> > > > > Thanks,
> > > > > ccie1101.
> > > > >
> > > > >
> > > > > On 10/26/07, Joseph Saad <joseph.samir.saad@gmail.com > wrote:
> > > > > >
> > > > > > Not only you are stopping redistribution of connected routes,
> > > > > > but also you are achieving nothing by match int null0 (as this match
> > > > > > connected routes) and you are trying to match a summary route that is learnt
> > > > > > via EIGRP.
> > > > > >
> > > > > > You need to match the summary address in a route-map that calls
> > > > > > a prefix list.
> > > > > >
> > > > > > ip prefix-list SUMMARY permit X.X.0.0/16
> > > > > >
> > > > > > route-map EIGRP2OSPF deny 10
> > > > > > match ip address prefix-list SUMMARY
> > > > > >
> > > > > > route-map EIGRP2OSPF permit 100
> > > > > >
> > > > > > router ospf 1
> > > > > > redistribute eigrp 20 subnet route-map EIGRP2OSPF
> > > > > > redistribute connected subnets
> > > > > >
> > > > > >
> > > > > > I strongly advise that you watch Internetwork Expert CoD
> > > > > > Advanced Technology classes. I am however not affiliated with them, but have
> > > > > > seen a considerable difference over a span of 3 months using their products.
> > > > > >
> > > > > >
> > > > > >
> > > > > > Joseph.
> > > > > >
> > > > > > On 10/25/07, ccie1101 < ccie1101@gmail.com > wrote:
> > > > > >
> > > > > > > Hi GS,
> > > > > > > I am redistributing EIGRP into OSPF and since I have an
> > > > > > > eigrp
> > > > > > > summary-address that goes into OSPF when
> > > > > > > the redistribution takes place which has the whole network of
> > > > > > > X.X.0.0/16, do
> > > > > > > I need to do something like this ?
> > > > > > >
> > > > > > > router ospf 1
> > > > > > > redistribute eigrp 20 subnets route-map DENY_NULL
> > > > > > > !
> > > > > > > route-map DENY_NULL deny 10
> > > > > > > match int null0
> > > > > > > !
> > > > > > > !
> > > > > > > route-map DENY_NULL permit 20
> > > > > > > !
> > > > > > > !
> > > > > > > I think this is the way to go around as we should not
> > > > > > > be seeing the
> > > > > > > summary-address back into the whole POD.
> > > > > > >
> > > > > > > Pls advice,
> > > > > > >
> > > > > > > cheers,
> > > > > > > ccie1101.
> > > > > > >
> > > > > > > _______________________________________________________________________
> > > > > > >
> > > > > > > Subscription information may be found at:
> > > > > > > http://www.groupstudy.com/list/CCIELab.html
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