Loopback, Management and Router ID's

Unanswered Question
Mar 20th, 2008

Fellow Net Pro's

I am currently working on a new data center design that will be housed at a co-lo facility.

What I was wondering is if I assigned a loopback address to every device that I have on my diagram. Does it make sense to use it as the router ID for the OSPF process running, as well as the management ip of the device.

Since I will be summarizing routes at various modules of the ospf process, the loopback address will be an address included in the subnet that I will be advertising. Hence there could be various loopback addresses from different subnets. Does this make sense or should I just allocate a subnet to use for Router ID's and the management (traditionally management vlan/nrtwork) network.

I have this problem too.
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Richard Burts Thu, 03/20/2008 - 11:29


I would think it was appropriate to use the loopback address as both the OSPF routerID and as the management address of the router. Just make sure that as you do your summarizations that you do not mis-direct how to get to the address.



amohabir1 Thu, 03/20/2008 - 11:37

Yes thats exactly what my plan was. i just wanted to be sure that it made sense to do so. I don't want to create a seperate managment vlan for all of the devices.

The loopback addresses that I will be assigning will be based part of the summarization route that the devices will be advertising. So for example...the 4510's will advertise the network and a possible loopback address that would be used is


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