[j-nsp] Filtering OSPF routes

[Elliott, Andrew]

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Wayne, 
 
I have seen this in action, and it is ugly.
 
I recently had to work on a Cisco network where all routers were in
one of two areas, and they were using the distribute-lists to only
use the 0/0 LSA.  This created many routing loops, and I asked the
"designer" what they were thinking, and basically got the cold
shoulder.  I couldn't understand why someone would want to use OSPF
and then deliberately break it in that manner.
 
Has anyone on this list ever seen a good reason to filter LSAs?
 
- -andrew

- -----Original Message-----
From: Wayne (juniper nsp) [mailto:wg-jnpr-nsp at wgustavus.com] 
Sent: Saturday, February 15, 2003 11:43 PM
To: Ben Buxton; Ajay Bhardwaj; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Filtering OSPF routes



Actually, if you are running a sufficiently high enough version of
IOS (e.g. 12.0S), the 7200 can filter some LSAs.  It depends on your
exact scenario if this will accomplish what you are trying to do.  It
does tend to go contrary to the design of OSPF (or any link state
protocol), but I suppose enough people wanted the knob, so they got
it.
 
Not sure if JUNOS has a similar knob.
 
- - Wayne 

- ----- Original Message ----- 
From: Ben Buxton 
To: Ajay Bhardwaj ; juniper-nsp at puck.nether.net 
Sent: Monday, February 10, 2003 4:18 AM
Subject: RE: [j-nsp] Filtering OSPF routes

 
You cannot filter OSPF. This would break the requirement that all
routers have
the same link state view.
This is true for both Junos and IOS.
 
BB

- -----Original Message-----
From: Ajay Bhardwaj [mailto:ajay.bhardwaj at in.spectranet.com] 
Sent: Monday, 10 February 2003 08:39
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] Filtering OSPF routes


Hi all,
 
We have cisco 7200 router and M-5 router both running ospf and part
of area 10.
 
I want to deny few routes which are flowing trough ospf from 7200 to
m5 either at 7200 side or m5 side. Pls if anyone have any solution to
this would be gr8 help for me.
 
Ajay Bhardwaj



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