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OSPF design choices

Posted on 2011-02-14
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Last Modified: 2012-05-11
I am setting up a couple of new links to a remote office and would like to use OSPF for dynamic routing.  The primary link will be a 2MB Mpls link and the secondary will be a GRE vpn tunnel over the internet.  I am still in the planning/design phase and I am wondering about the best choice and best practice in terms of assigning the router-id's as I understand this will dictate which router will become the DR.  I am looking for a suggestion on whether or not I should use a loopback address or just manually configure the router-id?  Also,  what IP addressing is the safest to use for router-id scheme and also what would be the best router to choose as the DR assuming all the routers are the same in terms of processing power and memory?

thanks
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Question by:FREDARCE
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Expert Comment

by:Don Johnston
ID: 34890036
The loopback/router ID method was created so we could have control over the router ID. Once the "router-id" command was implemented, using the loopback interface method was no longer needed. Personally, I like using the "router-id" command.

As for addressing, I like to use numbers that stand out from IP addresses. For example, I typically use 1.1.1.1, 1.1.1.2, 1.1.1.3, etc.

But since it's a just a router ID, you can use any 32-bit dotted decimal number you want.
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by:FREDARCE
ID: 34890101
thanks donjohnston,

What about deciding which router should be the DR?  What would be the influences for determining this?
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Don Johnston earned 500 total points
ID: 34890132
If the connection is a point-to-point link, there is no DR. If it's not (and a DR election takes place), I would go with the router that has more CPU and memory.
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Author Closing Comment

by:FREDARCE
ID: 34890153
thanks
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