From: Rich Collins (nilsi2002@gmail.com)
Date: Mon Oct 29 2007 - 15:36:37 ART
Yes you are right - both methods can work.
I think it is good if you know what you showed in case you have to
redistribute ...without prefix lists allowed.
On 10/29/07, ccie1101 <ccie1101@gmail.com> wrote:
>
> Thanks Joe/Shiran .... I did the following and it seems to work.
>
> router ospf 1
> redistribute eigrp 10 route-map DENY_NULL
> !
> route-map DENY_NULL deny 10
> match int null0
> !
> route-map DENY_NULL permit 20
> !
> When I do the following config, the summary-route is not in the OSPF
> domain anymore .... I guess this is also doable in this case since the
> summary-route is pointed to the Null0 interface .... For normal route
> filtering, then one has to use a prefix-list I guess .... Okay, thanks a
> bunch !
>
> ccie1101.
>
>
>
>
> On 10/29/07, Joseph Saad <joseph.samir.saad@gmail.com> wrote:
> >
> > 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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