From: simon hart (simon@harttel.com)
Date: Mon Sep 19 2005 - 11:25:13 GMT-3
Hi,
You say that Area 1 can't be changed into a stub or nssa because of the need
for virtual link. However you need to filter off LSA 5's.
The easiest method of resolving this problem is to make Area 1 either stub
or NSSA (depending upon LSA7 restriction) and then think of a method of
providing a virtual link - without using the OSPF virtual link command. This
can be done
Simon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Private Ryan
Sent: 19 September 2005 15:14
To: chrlewis@cisco.com
Cc: Cisco certification
Subject: Re: Route Filtering in OSPF
thanks for your response.
But I find that, in r3, the the next hop to reach external route is
r2-e1. it is direct-connected route.
Since area 1 contains Virtual-link, I can't convert it into stub area
(such that it will deny external route automatically).
I found that distance command can prevent/filter some routes to enter
the route table.
2005/9/19, chrlewis@cisco.com <chrlewis@cisco.com>:
> One possibility (and I have no idea if this meets all the requirements
> or breaks something else in your lab) is that you could filter the inter
> area route for the subnet between r1 and r2 from being sent to r3.
>
> If r3 receives an eternal route from r2, it will check to see if it has
> a route to the forward address of the external route (which would be the
> route I've usggested you filter out). Without an inter or intra area
> route to the forward address of the external route, r3 will not install
> the route.
>
> Chris
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Private Ryan
> Sent: Sunday, September 18, 2005 1:46 PM
> To: Cisco certification
> Subject: Route Filtering in OSPF
>
> Hi All,
>
> I have the problem:
>
> ----(e0)r1(e1)------(e0)r2(e1)------(e0)r3
>
> r1(e1): ospf area 0
> r2(e0): ospf area 0
> r2(e1): ospf area 1
> r3(e0): ospf area 1
>
>
> e0 of r1 is redistributed connected into OSPF. How can filter Type-5
> route such that r3 will not see this Type-5 route ? Area 1 can't be
> changed into stub or nssa.
>
> I can't use "area X filter-list" because it can only filter Type-3
> route.
>
> How to do that? Thanks a lot !!
>
>
> Ryan
>
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