OSPF.Announce routes without interfaces.

[ru-spawel]

Hi!

At first sorry for my english, i am from russia.

I have cisco 1841 router in the branch office and the 2811 in the main organization. I can config only my router.

In my network i have some subnetworks in different VLANs. The core of the network is 3 Com switch with layer 3 routing. every subnetwork has as default router sub-interfase in switch and switch has default router cisco. in cisco i have static routes for every subnetwork in lan.

And now question. Now i am installing ipsec gre tunnel with chief office and i need to anounce over ospf my routes, but as a i know ospf can work only with networks which have the same interfaces in router. it mean that i cannot anounce routes to my subnetworks because i have only static routes for them, not interfaces.

Can you say me how can i announce these routes to another point in gre-tunnel.

Ofcourse i can ask system administrator in main office to write special routes in static table and it will be fine but it is interesting for me to solve this problem.

Maybe i can use loopback interfaces? i can add loopback interfaces to every vlan that i want to transmit over ospf, bit now i cant check this idea.

Cisco Guru cab You help me!

[ru-spawel]

My idea with loopback doesnt work ((

[nkarpysh · Accepted solution]

Hi Pavel,

Did you consider option of use "redistribute static" comamnd under "router OSPF Process_number" process?

This will make OSPF to announce static routes to other OSPF neighbors. Loopback option also might work - but you will need to include loopbacks ip addresses with "network" command under OSPF process.

Hope should help if I understood your problem correctly.

Nik

[ru-spawel]

"redistribute static" - that is what i need. thanks a lot!

[Joseph W. Doherty]

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You might want to "tag" the injected statics so it's easy to recognize them.

If needed, you can also filter which statics are injected into the OSPF topology.