From: shiran guez (shiranp3@gmail.com)
Date: Sun Dec 09 2007 - 09:42:41 ART
even if he would filter with Distribute list he could not effect R4 as he
want to do configuration only on R1 and R2, the Distribute list is also in
case of OSPF only on the local Router to the inside direction.
Link State - all the Routers within the area are aware of each other link
state, if there is even one router in the area with different Database it is
not really a link state.
the Database is equal on all routers within the area.
The routing table can be effected only locally with in the router in a
specific area no meter from what angle you look on it.
On Dec 9, 2007 2:21 PM, shahid Ansari <shahid1357@gmail.com> wrote:
> Hi Phillip,,
>
> Distance command is only effect on Local router .so it will not effect to
> R4 at all and in OSPF as you know routes can not be control by using OUT
> keyword due to its way of LSA working.
>
> *Inter-Area Filtering*
> **
> 1)OSPF summary-prefixes on ABRs
> Area X filter-list ( called by prefix list) - Between two Areas
>
> 2)Filter OSPF summary-prefixes using network ranges
> Area X range a.a.a.a b.b.b.b not- advertise (keyword)
> not-adv keyword use to block propagation of summary .
>
> 3)Ingress Filtering with Distribute-list (egress doesn`t work)
> note that distribute list only block route from entering local RIB, and
> does
> not stop LSA propagation
> distribute-list X in (called by access-list)
>
> In your case you can use distribute-list with access-list to block routes
> but it will enter to your database.
>
> Thanks
>
> Shahid
>
>
>
> On Dec 8, 2007 7:55 PM, Kim teu <kim.teu@gmail.com> wrote:
>
> > Distance is locally significant. You have to use distance 255 on all
> > router
> > to prevent the route from entering the routing table, but it will still
> > show
> > up in the OSPF database.
> >
> > Regards,
> > Kim
> >
> >
> > On 12/8/07, Darren Johnson <dazza_johnson@yahoo.co.uk> wrote:
> > >
> > > I don't believe the distance command will work here. My understanding
> of
> > > the
> > > OSPF distance command is, there are two options:
> > >
> > > 1) Distance command is used to change OSPF admin distances received
> from
> > > ANY/ALL routers.
> > > 2) Distance command can be configured to change admin distance for
> > > specific
> > > routes (reference in an ACL) from specific routers (specified as
> > > RouterID).
> > >
> > > In both cases, this is required on the 'local' router. In this task,
> its
> > > states that you cannot touch R4 to achieve this.
> > >
> > > Any other ideas guys?
> > >
> > > Dazzler
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > > itsfortarget iwillgetit
> > > Sent: 08 December 2007 06:41
> > > To: Phillip.McCollum@ins.com
> > > Cc: ccielab@groupstudy.com
> > > Subject: Re: ospf intra are route filtering
> > >
> > > Hi Phillip,
> > >
> > > Can u give some inputs how distance works in this scenario?
> > >
> > > On Dec 8, 2007 1:52 AM, <Phillip.McCollum@ins.com> wrote:
> > >
> > > > That 'distance' command could be useful here:
> > > >
> > > >
> > http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hi
> > > > rp_r/rte_pih.htm#wp1134155
> > > >
> > > > Phillip
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of
> > > > itsfortarget iwillgetit
> > > > Sent: Friday, December 07, 2007 10:33 AM
> > > > To: ccielab@groupstudy.com
> > > > Subject: ospf intra are route filtering
> > > >
> > > > Dear Group,
> > > >
> > > > Pls listen this.....
> > > > I have Three Routers say R1, R2 , and R3 are connected in a
> > > > triangle topology and all are in OSPF area 0. now R3 is connoted
> with
> > R4
> > > > with a serial link which is also part of area 0.In R1 have some net
> > > > works
> > > > say, 192.168.1.0, 2.0 and 3.0 which is published in OSPF domain.My
> > > > policy
> > > > strict that the 192.168.3.0 network should not appear in R4's
> routing
> > > > table,
> > > > but I have only access to R1 and R2 to achieve this task.
> > > >
> > > > could you please throw some inputs to filter this OSPF route in this
> > > > single
> > > > area?.
> > > >
> > > > Regards.
> > > >
> > > >
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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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