OSPF

[rmv72]

I want to build test network and i need advice. Here my scenario:

-----R1-City C

e0 - Area 3 -stub or nssa?

s1.1 - Area 0 - Frame Relay to R2-s0/0.2

-----R4-City A

e0 - Area 5 -stub or nssa?

s1- Area 2- Frame Relay to R2-s0/0.1

-----R2-City B,Campus 1

s0/0.1- Area 2- Frame Relay to R4-s1

s0/0.2- Area 0- Frame Relay to R1-s1.1

e0/0- Area 1 - Ethernet to R3-e0

-----R3-City B,Campus 2

e0- Area 1- Ethernet to R2-e0/0

e1 - - Area 4 -stub or nssa?

----------

Is't right or maybe not? Which other advices?

Is't necessary virtual link from Area 4 and Area 5?

[thisisshanky]

In this case you will need to configure a virtual link from R3 to R2, with area 1 as transit area to link area 4 to area 0.

You also need a virutal link from R4 to R2, with area 2 as transit area, to link area 5 to area 0.

HTH

[gjackson]

If I am understanding your setup (and I am not sure I do), you will indeed need virtual links for A4 and A5. I am just uncertain as to why you would set it up this way. As far as stub vs. NSSA, depends what you are doing in Areas 3, 4 and 5. If you stick to your current design, then they can be stubs.

HTH

[tomredmond]

How about this suggestion,

Make the ethernet port of R2, e0/0 and both ethernet ports of R3 e0, e1 area0. Then all the ports of R1 and the interface connecting them on R2 (s0/0.2) area1. Finally all the interfaces on R4 and the interface connecting them on R2 (s0/0.1) in area2.

This gives two areas that both connect to area0, the choice of stub or NSSA is dependent on what is going on on the networks.

[rmv72]

Yes, it's very interesting suggestion!

Can you little explain me in which situations i must break into two different areas( like i made before) and when i must unite routers in one area(like you offered)? Is't because reduce areas or avoid to create virtual links for connecting Area 0?

[tomredmond]

Sorry I did not respond earlier but I have been away for a few days.

I think the limit for an area is approx 25/30 routers, however I usually work on the basis of an area for each wan link from area0 as I think this makes the administration easier. However there is a cisco design guide here

http://www.cisco.com/en/US/tech/tk365/tk480/tech_design_guides_list.html

Hope this helps

Tom