OSPF neighbor

[nitinnigam]

Hi,

The two router (routerA and routerB) are connected via frame-relay point-to-point nonbroadcast network using OSPF as routing protocol.

router A

int s0/0.1 is on 1.1.1.0 network

int s0/1.1 is on 2.2.2.0 network

int f0/0 is on 3.3.3.0 network

router B

int s0/0.1 is on 1.1.1.0 network

int s01.1 is on 20.20.20.0 network

int f0/0 is on 30.30.30.0 network

since 1.1.1.0 network is a nonbroadcast network so it will not exchange the OSPF routes if I am right.

If I want to tell RouterA about 20.20.20.0 and 30.30.30.0 (same for RouterB about 2.2.2.0 and 1.1.1.0) do I have to use ospf neighbor command (if yes how should I use it) and is there anything else I can do, I dont want to use static routes.

Thanks

[ruwhite · Accepted solution]

Are the subinterfaces defined as point-to-point? If so, just put in ospf network statements on both routers, and it should just work. If they are defined as multipoint subs--I would first reconsider, and make them point-to-point subinterfaces, unless you are really going to have more than one remote attached to the same subinterface. If you must leave them configured as point-to-multipoints, then you have a couple of options:

-- Configure the subinterface as nonbroadcast, and manually define the ospf neighbor on the other end. Configure ospf with the right network statements, and this should work.

-- Configure the subinterface as a point-to-multipoint.

-- Configure the subinterfaces as broadcast networks, and configure the ospf priority on the "hub" router so it's always the DR.

http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a008009470d.shtml

http://www.cisco.com/en/US/tech/tk365/tk480/technologies_configuration_example09186a0080094054.shtml

http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a0080094051.shtml

One of these should help. The way I would do it would be to define those subinterfaces as point-to-point. That's the simplest/easiest way around it.

Russ.W

[nitinnigam]

Hi Russ,

I have defined subinterfaces as point-to-point.

So should I use "ip ospf network broadcast"

and thanks for the doco links.

Nitin

[ruwhite]

I'd leave them as point-to-point, and just put in a network statement under router ospf to include them in the ospf process.

Russ.W