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OSFP Design Considerations for 3-site network across MPLS

Hi Experts,

We have three sites joined by T1s. We are migrating to an MPLS cloud. We currently run OSPF with multiple areas, and our MPLS provider asked us to simplify our OSFP configuration by using a single zone across all sites. From a network perspective, every site will be the same. Starting at the internet and working in, each site will look like this:

Internet --> Internet Provider Router --> Firewall --> LAN Router --> MPLS Provider Router --> MPLS Cloud

We aren't very familiar with OSPF, and we'd like to verify that it's possible to have a single OSFP area (Area 0) across all three sites. The devices participating in this would be:

- Firewall (inside interface)
- LAN Router (all interfaces)
- MPLS ROuter (Lan-side interface)

Note: We plan to inject OSPF into BGP for routing in the MPLS cloud.

Thank you!
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meade470
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meade470
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Don JohnstonInstructorCommented:
How many routers and how many networks?
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meade470Author Commented:
We are a small organization. Each site has only one router that we manage (not including the internet and MPLS routers, which we don't manage). And our ASAs (one per site) participate with OSFP. We have about 2 - 5 networks per site.
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Don JohnstonInstructorCommented:
Then a single area is fine.
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meade470Author Commented:
Thanks! I have a couple of quick follow-ups, if you don't mind.

1.) We'd like all networks on each router to participate with OSPF (we have several networks on subinterfaces). Would the command for this be:

router ospf 1
 network 0.0.0.0 255.255.255.255 area 0

2.) Our current OSPF configuration has "area ranges" defined, such as this:

router ospf 1
 area 1 range 192.168.24.0 255.255.248.0

Is this necessary given our small network? Would you advise continuing with this command?
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Don JohnstonInstructorCommented:
router ospf 1
 network 0.0.0.0 255.255.255.255 area 0
That's one approach (and it works). Personally, I prefer a separate network statement for each interface.

router ospf 1
 network 192.168.1.1 0.0.0.0 area 0
 network 192.168.2.1 0.0.0.0 area 0
 network 172.16.12.1 0.0.0.0 area 0
 etc...

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area 1 range 192.168.24.0 255.255.248.0

Is this necessary given our small network? Would you advise continuing with this command?
The area range command is used to summarize routes on an area border router. Since you'll be a single area environment, there is no summarization. So it unnecessary and will not accomplish anything.
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meade470Author Commented:
Awesome. Thanks for all your help!
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