Re: OSPF route installed when recursed via connected interface

Dood,

I appreciate that - this has to be an OSPF solution - I'm thinking
that if I change the AD of iBGP and do an advertise map and set the
next hop - but it's a bit of a cludge.

Cheers for the comms though ;-)

Rich Lowton CCIE 24290

On 2 Oct 2009, at 15:07, Bryan Bartik wrote:

> Richard,
>
> Static routes are preferred over OSPF by default. You can change the
> AD of static routes by adding the distance to end of the route
> command:
>
> ip route 192.168.0.0 255.255.255.0 <pix ip> <AD>
>
> -hth
>
> On Fri, Oct 2, 2009 at 7:52 AM, Richard Lowton
> <lowton_at_packetfreak.net> wrote:
> Guys,
>
> This is doing my head in and even if it can't be done - at least I'd
> like someone who may have done this enlighten me.
>
> Router A is connected to a /23 network on its fa0/0 interface
> Router A has a point to point link to Router B each on their fa0/1
> interface
> Router B is connected to a /23 network on its fa0/0
> Both Router A and Router B are sharing the same /23 space but at
> different geographical locations.
>
> So now we add the salt...
>
> Behind each Router and in the /23 space there is a PIX which also
> has a /23 mask BUT is authoritative for one of the /24 networks
> within the /23 space and 'secondary' for the other /24 within that
> space. What I want to do it advertise both of the /24's into OSPF at
> each PIX into RTR_A and RTR_B. So I've got a couple of static routes
> pointing to the PIX interface for each /24 and then a route-map
> redistributing the /24's to the RTR's at each end...job done.
>
> The problem I see is that each of the RTR's receives the /24
> networks from both PIX boxes BUT when the route is added to the
> routing table it sees the next hop via the /23 interface fa0/0 NOT
> the point-to-point link fa0/1.
>
> Diagramatically we have:
>
> PIX_A <-> fa0/0 RTR_A fa0/1 <-> fa0/1 RTR_B fa0/0 <-> PIX_B
> 192.168.0.0/23 <-> 192.168.255.0/30 <-> 192.168.0.0/23
>
> PIX_A has IP address 192.168.0.254/23
> PIX_B has IP address 192.168.1.254/23
> RTR_A has IP address 192.168.0 1/23
> RTR_B has IP address 192.168.1.1/23
>
> PIX_A is advertising networks 192.168.0.0/24 and 192.168.1.0/24 with
> metric added to the 192.168.1.0/24 network
> PIX_B is advertising networks 192.168.0.0/24 and 192.168.1.0/24 with
> metric added to the 192.168.0.0/24 network
>
> The routing table for RTR_A sees the 192.168.1.0 /24 via interface
> fa0/0
> The routing table for RTR_B sees the 192.168.0.0 /24 via interface
> fa0/0
>
> The outcome is that the routes are in the table which is great but
> that the next hop is via the wrong interface. How can we get OSPF to
> install the route so that it goes via the fa0/1 interface and not do
> a recursive lookup and send it out the connected fa0/0 interface?
>
> Cheers Gurus
> Rich
>
>
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>
> --
> Bryan Bartik
> CCIE #23707 (R&S), CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com

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Received on Fri Oct 02 2009 - 15:12:58 ART