From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Mon Oct 29 2007 - 12:53:10 ART
I think I started to understand.
You mean that you have a summary address of EIGRP and hence you have the
EIGRP summary pointing to Null0 and you want to prevents this from being
redistributed into the OSPF domain.
I'd actually name this "a summary route pointing to the NULL interface".
Which typically has an AD of 5 for EIGRP.
For you to prevent the NULL route from being injected into the OSPF domain,
you need to match the prefix (and not the interface).
i.e.
ip prefix-list DEFAULT seq 5 permit x.x.0.0/16
route-map EXCLUDE_DEFAULT deny 10
match ip address prefix-list DEFAULT
route-map EXCLUDE_DEFAULT per 20
router ospf 1
redistribute eigrp 20 subnets route-map EXCLUDE_DEFAULT
Joseph.
On 10/29/07, ccie1101 <ccie1101@gmail.com> wrote:
>
> 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.
> > > > > > > >
> > > > > > > >
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