OSPF on Virtual Interfaces?

fonestar1978

Hi there, I am to setup OSPF in a relatively simple network consisting of two Cisco 2911 with CME installed and a few switches. We are using vlan interfaces for the routes, I've never done it this way so I'm just wondering if there is anything different or preferred method of doing it?

For example, can I just:

R1(config)#int vlan 20
R1(config-if)#ip ospf 1 area 100

and then....

R1(config)#router ospf 1
R1(config-router)#network 10.0.20.0 0.0.0.255 area 100

and then apply OSPF to the physical interface participating...

R1(config)#int Gig0/2
R1(config-if)#ip ospf 1 area 100

I have heard it is best to only route the management vlan using OSPF? Do I have the right idea or is it best to just let OSPF source these routes by itself as directly connected and then redistribute them? Or does it even make a difference?

I have noticed when I bring the native vlan 20 up in our network I loose all layer 3 connectivity and when I shut vlan 20 down the network comes back up immediately.

I know this is probably a trivial question for some of you gurus but your help is appreciated!

Forsaken_GA

just put the port you're wanting to route over into the vlan (i guess in your case you're using vlan20 as your management vlan) and then have that SVI (vlan interface) as the one that participates in OSPF, not the physical interface.

If you want to source your other directly connected SVI's into OSPF, redistribute connected subnets