At 01:16 AM 5/17/01 -0400, Vincent Chong wrote:
>Hi;
>
> For OSPF implementation, an area can be configured in the Loopback
>interface.
>But what purpose, when should I do it?
>
>TIA
>Vincent Chong
Well, somewhat off topic, but the router id will lock on to the loopback
address, which might stabilize the network more. However, I think you even
wrote to the list an email about that so that probably is not what you are
asking.
Now why would you want to advertise a loopback interface using OSPF or any
IGP? To teach the IGP how to get their later on for redistribution into
BGP. Basically only used if you need to use an AS as a transit AS. You
have basically two choices.
IBGP (full mesh) to the ASBRs of the transit AS. Or, you can redistribute
the "transit route" through an IGP instead. They tend to use loopback
interfaces to help the transit ASs achieve more stability to avoid
flappage. I am somewhat new on this, so if I am wrong, I will happily
defer to someone with more experience, but this is my take on it from what
I have read.
-Carroll Kong
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=4836&t=4802
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