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

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From: Guy Harris <gharris@xxxxxxxxxxxx>
Date: Sat, 22 Jan 2000 16:34:03 -0800
> Unless frames *other* than ISL frames use an OUI of 00-10-7B, the way to
> recognize an ISL frame is to look for frames with that OUI, and
> interpret the PID appropriately.

Or, alternatively, quoting the ISL description on the page at

	http://www.cisco.com/warp/public/741/4.html

which says:

	2.1.1 DA - Destination Address

	The DA field of the ISL packet is a 40 bit destination address. This
	address is a multicast address and is currently set to be:
	0x01_00_0C_00_00. The first 40 bits of the DA field signal the
	receiver that the packet is in ISL format. 

so the Ethernet dissector can check the destination address and
special-case it.