Ethereal-dev: Re: [ethereal-dev] Plugin for Cisco ISL

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From: Guy Harris <guy@xxxxxxxxxx>
Date: Tue, 25 Jan 2000 14:20:14 -0800 (PST)
> >Or, rather, the first 5 octets, as the 6th octet contains the
> >encapsulation type plus a per-encapsulation-type value of some sort
> >(it's a priority for Ethernet, and distinguishes different packet types
> >in some unspecified fashion - LLC vs. MAC? - on Token Ring).
> 
> This is an ISL-specific encoding of that last octet, right?

Yes.  If a protocol grabs a block of multicast addresses starting with
some bottom bits being 0 and going up to those bits being 1, it can
presumably use those bits as extra protocol header bits in whatever
fashion it chooses.