Influencing OSPF Routes

Influencing OSPF Routes
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Subject Author Date
Influencing OSPF Routes amospjohnson 03-21-2006
Posted by on March 21, 2006, 8:07 pm
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I have a 2 Cisco routers and a Cisco VPN concentrator in parallel, plus
there is another cisco router sitting behind them.

-- VPN Concentrator---------------
Internet| |---------Cisco
Router3
-- Cisco Router1----------------------
-- Cisco Router2--------------------

OSPF is running between the all 4 devices. There is a route towards
the internet out of each router, and there is a *Backup* Route for each
cisco router pointing towards the VPN concentrator. For example, I
need a way in ospf to have Router3 Prefer the Route thru Router 2, and
if the wan link is down, have Router3 prefer the route over the VPN
conentrator. In addition I need Router3 to prefer the route thru
Router1 and if its wan link is down, have Router3 prefer the route over
VPN.

Keep in mind that there are multiple "primary" routes to each of the
cisco routers, so costing the physical links will not work. I need a
way to cost each route on Router3.

Thanks


Pure Networks
Posted by Merv on March 21, 2006, 8:27 pm
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Consider changing to BGP, then use route-map to maniuplate the routes
almost anyway you want


Posted by on March 21, 2006, 10:36 pm
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BGP will not work because the cisco VPN concentrator does not support
BGP


Posted by Merv on March 22, 2006, 6:17 am
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Check out OSPF inbound route filtering using route maps



route-map SELECT_OSPF_ROUTES permit 20
match ip route-source ! router 2
match ip
set metric

route-map SELECT_OSPF_ROUTES permit 30
match ip route-source !VPN concentrator
match ip
set metric

route-map tag-filter permit 40



router ospf 1
router-id x.x.x.x ! ensure router-id is configured on all router
involved
distribute-list route-map SELECT_OSPF_ROUTES in


Posted by John Agosta on March 21, 2006, 10:19 pm
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You may want to look into playing with changing administrative distances
bases on the 'source' of the route:

distance xxx [ipofroutesource] [mask] [newdistance]

-ja




>I have a 2 Cisco routers and a Cisco VPN concentrator in parallel, plus
> there is another cisco router sitting behind them.
>
> -- VPN Concentrator---------------
> Internet| |---------Cisco
> Router3
> -- Cisco Router1----------------------
> -- Cisco Router2--------------------
>
> OSPF is running between the all 4 devices. There is a route towards
> the internet out of each router, and there is a *Backup* Route for each
> cisco router pointing towards the VPN concentrator. For example, I
> need a way in ospf to have Router3 Prefer the Route thru Router 2, and
> if the wan link is down, have Router3 prefer the route over the VPN
> conentrator. In addition I need Router3 to prefer the route thru
> Router1 and if its wan link is down, have Router3 prefer the route over
> VPN.
>
> Keep in mind that there are multiple "primary" routes to each of the
> cisco routers, so costing the physical links will not work. I need a
> way to cost each route on Router3.
>
> Thanks
>



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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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