[quagga-users 5637] Re: How can i lock OSPF route table?

Sebastian Jaenicke sj+quagga at jaenicke.org
Mon Oct 17 03:40:05 IST 2005

Hi list,

On Mon, Oct 17, 2005 at 01:52:13AM +0700, Pham Mai Quan wrote:
> RouterA
> router-id
> network (used:
> network
> RouterB
> router-id
> network
> network (private network, like DMZ)
> RouterC
> router-id
> network
> network
> network (yes, another private network)
                           ^^^^^^^ Ouch!

I'm reading this as

   A  .1 ________ __________ .2  C---
   .1                                           |
   |                                            |


Using the same logical addresses in two different locations
( at Router B and C) is an exceptionally bad idea.
(And you'll get yourself in serious trouble if you don't 
renumber one of them.)

> I dont want RouterA add route for, and RouterC and B dont detect as fail-reduntdant. How can i do that?

Looks like I don't understand your question - if you don't want
to appear in the OSPF routing table, why did you configure B and C to
announce those routes?

In case you're just trying to filter specific routes - all routers
within an OSPF area have the same link-state database, so route 
filtering can only be done by ABRs. You'll need to partition your
backbone into different OSPF areas, e.g.,		Area 0 (at Router B)		Area 1 (stub)				Area 2 (stub) (at Router C)		Area 3 (stub)

Have a closer look at Cisco's OSPF design guide at


- Sebastian
Progress (n.): The process through which Usenet has evolved from
smart people in front of dumb terminals to dumb people in front
of smart terminals.
              -- obs at burnout.demon.co.uk
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