Re: nhrp-05 - Purge packets

[Bruce Cole <[e-mail]>]

> > > > >When a station receives an NHRP Purge request, it MUST discard any
> > > > >previously cached information that matches the Source Address and
> > > > >Request ID (when the Request ID is zero filled the match is made
> > > > >based only on the Destination Address).
> 
> Doesn't the receiver also have to match on some other things e.g.
> 
> - that the Purge comes from the same guy that supplied the cached 
>   information: match on Source IP Address or Source NBMA Address

Possibly; may be a problem for multi-homed stations.

> - that the QoS matches what was cached.

I don't think so; of course, use of QOS by NHRP is still under specified.

> - what about authentication? Is that used on Purges?

Sure, why not.  

> - what about NBMA Subnetwork ID? Nowhere is it mentioned that this
>   is or is not allowed in a Purge: presumably it does need to be
>   there in the Purge if an implementation is using it in Request/Reply 
>   packets. If it's there, it needs to be checked.

Yes, I suppose we should explicitly mention purge packets in the
descriptions of the various extensions.  Then the above sentence
could be further qualified to mention that extension processing is 
performed.