router with 2 ospf process

[phamthecong]

hi all,

we are plan to run 2 ospf processes on the same router. One process is for partner the other is for our company. In that way we can manage which route to be advertise to the partner without using route-map or prefix filter.

Is there any drawback of having 2 OSPF processes on the sam router.

thanks

[thisisshanky]

Depends on how many routes are involved, as running 2 ospf process, means maintaining different databases for each process. OSPF is processor intensive so look at your CPU utilisation as well as router model before enabling two processes.

[francisco-vazquez]

Hi,

drawbacks are memory and cpu requirements for the router to maintain both databases, but it depends on how many networks are planned to be advertised within each process. I do not get to see how are you planning to get rid off the route-maps, or should I say, any kind of route filtering. It would have to be a route-filtering strategy and plan independent of the routing protocols used on both sides of the network (partner and internal). Regards.

[ruwhite]

I always recommend the use of BGP in this situation, with private AS numbers, rather than an IGP. You get a lot of security features in BGP--it's a point-to-point connection, so you can use IPsc, GTSM, route flap dapmening, and a lot of filtering and policy capabilities. If you're going to use two OSPF processes, why not just crank up a BGP process instead?

:-)

Russ.W

[Richard Burts]

The original post indicates that part of their rationale is to:

advertise to the partner without using route-map or prefix filter.

If there will be no route maps and no prefix filters then I wonder how they plan to get the partner addresses advertised within the company network and how they plan to get the company addresses advertised to the partner.

Another aspect to bear in mind when contemplating running two OSPF processes is that an interface can be in only one OSPF process and can not be in both processes.

HTH

Rick