From: Swaroop Potdar (swarooppotdar@hotmail.com)
Date: Tue Nov 16 2004 - 13:02:32 GMT-3
Hi Brian,
Wouldnt this scenario be something like when we do database filter all out
where in the router doesnt have reachbility through the link where database
filtering is done and it will receive traffic through that interface but
send the traffic back through the other interface where in we are accepting
all the routes which have been denied in the first interface.
The same scenario would be created with a distribute list in over one
interface as what Sammie was trying to achieve.
So i was curious to know where black hole routing could occur.
<----LSA---
OSPF Domain<-------------- s0/0[[ router ]]s0/1 ---------------->OSPF
Domain
-----x LSA x --> <---LSA--->
(Distribute list in s0/0 routes denied)
>From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
>Reply-To: "Brian McGahan" <bmcgahan@internetworkexpert.com>
>To: "Hoonpongsimanont, Chalermchai"
><chalermchai.hoonpongsimanont@atosorigin.com>, "CCIE Sammie"
><cciesammie@yahoo.com>, <ccielab@groupstudy.com>
>Subject: RE: Distribution lists on OSPF
>Date: Tue, 16 Nov 2004 10:40:01 -0500
>
> Actually you can do this with a distribute-list inbound. It
>will not remove the LSA from the database but it will remove its
>associated route from the routing table. Note that other routers in the
>area will still have the LSA, and therefore this type of configuration
>may result in a traffic black hole.
>
>
>HTH,
>
>Brian McGahan, CCIE #8593
>bmcgahan@internetworkexpert.com
>
>Internetwork Expert, Inc.
>http://www.InternetworkExpert.com
>Toll Free: 877-224-8987 x 705
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>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>Of
> > Hoonpongsimanont, Chalermchai
> > Sent: Monday, November 15, 2004 9:27 PM
> > To: CCIE Sammie; ccielab@groupstudy.com
> > Subject: RE: Distribution lists on OSPF
> >
> > No, you can't. The basic rule is all OSPF router should have identical
> > link
> > state database.
> >
> > What you can do, is use area filter command at the ABR, or database
>filter
> > command. The area filter command can filter link state database
>between
> > different areas. The database filter will filter all link state
> > advertisement.
> >
> > Hope this help,
> > David
> >
> >
> >
> > -----Original Message-----
> > From: CCIE Sammie [mailto:cciesammie@yahoo.com]
> > Sent: Tuesday, November 16, 2004 3:36 AM
> > To: ccielab@groupstudy.com
> > Subject: Distribution lists on OSPF
> >
> > Hi,
> >
> > I am new to the group ... so I hope this has not already been
> > discussed.
> >
> > Is it possible to use a distribution list to filter OSPF updates in
> > from an interface? So for example, if I have two interfaces S1 and
>S2, is
> > it possible to filter the receipt of a particular OSPF route in from
>S1
> > but allow it in from S2. This will cause that route to point out S2
> > and not S1.
> >
> > Thanks!
> >
> > CCIE Sammie!
> >
> >
> >
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Regards,
Swaroop.
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