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IP for router ID

Dear ,

What is the practical way to define the right IP for Router ID?
Suppose one of my router eth with ip address 192.168.0.11, can i use this ip as router id ? and what about loopback ip ?

thanks,

ugnvs

Basically, if one does not take special measures a router can be accessed by telnetting to any configured IP address at any interface.

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lanboyo

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ikhmer

ASKER

Well, I want to enable ospf protocol in my existing network.
the point is should i assign ip of another subnet just router id or if router-id can be manually assign to be the same ip address of any interface's ip?

e.g: my Router A, ethernet0/1: 192.168.0.11
and i manually assign 192.168.0.11 as its router id ?

or should i set 192.168.11.11 ( ip of other subnet ) for Router A ID ? in this case i will wast one ip address.
so, what is the most practical way?

Best regards,

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mikebernhardt

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ikhmer

ASKER

thank you! so, i will need to have another subnet for router id.

mikebernhardt

Well, that's the easiest way because it doesn't interfere with your current addressing plan.

Rick_O_Shay

I manage my loopbacks which are also the router IDs by making them /32s and adding those host routes to the networks OSPF is routing to make them reachable throughout the network.

mikebernhardt

Yep, that's what I was saying. I've done that everywhere I've ever worked.

ikhmer

ASKER

well, i decide to assign router id manually and did not use loopback . the router id is the ip address of one eth interface of each router. so i don't need to have a separate subnet for just router id.

if you think it is not the appropriate way please give me your comments !