Re: [OSPF] Assign router address when only unnumbered I/Fs?

[Dave Katz <[e-mail]>]

A router must have at least one IP address in it somewhere, be it  
bound to a loopback or whatnot.

There's nothing wrong with advertising it in multiple areas, though  
particular implementations may or may not let you do so.  Putting it  
in only one area and advertising a summary into other areas would have  
the same effect at forwarding time.

Lots of room for implementation choices here.

--Dave

On Aug 10, 2009, at 12:59 PM, Joakim Tjernlund wrote:

>
> I got routers which only have unnumbered PtoP interfaces and I wonder
> how to advertise a host route as described in RFC 2328:
> [2]It is possible for all of a router's interfaces to be unnumbered
>    point-to-point links.  In this case, an IP address must be assigned
>    to the router.  This address will then be advertised in the  
> router's
>    router-LSA as a host route.
>
> The first that comes to mind is to just assign an IP address/32 to
> the loopback or dummy interface and start OSPF on that I/F. However,  
> you
> can only assign one area to that I/F. How have other people
> solved this?
> Ideally there would be a command that lets me assign a
> IP address which will be advertised in all areas.