Re: [OSPF] multilple numbered PtoP links with the same local IP address

[Acee Lindem <acee at lindem.com>]

On Aug 13, 2009, at 3:40 AM, Joakim Tjernlund wrote:

> > Is there something in the OSPF spec which prevents it from operate
> > on multiple numbered PtoP interfaces with the same local IP address?
> >
> > I have that working, but there are arguments that this is allowed by
> > OSPF, i.e, ethier use unnumbered links or unique local IP addresses.
> >
> >  Jocke
>
> Got some comments on this but nothing conclusive, I really want
> to know. Acee, what do you think?

Since there is only a type 1 (router link) in the Router-LSA for each  
unnumbered link, it makes no difference how many use the same IP  
address.

The only OSPF protocol restriction is that you must advertise at  
least one intra-area IP address (via a type 3 link) in any transit  
area you want to be the endpoint for a virtual link.

Hope this Helps,
Acee






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