Ethereal-dev: Re: [ethereal-dev] vlan updates and filtered capture

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From: Guy Harris <gharris@xxxxxxxxxxxx>
Date: Sun, 5 Dec 1999 16:01:38 -0800
> No, they're LLC packets of a form we don't know how to decode - the data
> is real packet data, but I, at least, no idea how to interpret it, or
> even what protocol it's for.

I stumbled across the names of some Cisco protocols that may be involved
with VLANs:

	Dynamic Inter-switch Link (DISL)

	VLAN Trunk Protocol

and also found pages that assert that various (commercial) packet
analyzers (Shomiti Surveyor, WG Domino, etc.) can decode those.

Does anybody know whether

	there's public Cisco documentation for the layout of
	protocols such as DISL, VTP, CDP (for which we have a partial
	dissector based on looking at packets and reading an Internet
	draft for a CDP-derived protocol), and so on

or

	those analyzer vendors got non-public documentation for them
	from Cisco?