Sorry to bother - found it myself.
Giles p156
'An XID frame with a null SAP can be used to retrieve information from a
remote network station. This form of the keep-alive packet is used to test
the presence of the remote station.'
> Tim Begley
> Austrapay Ltd
> Ph: +61 2 93298916
> Fx: +61 2 9209 8880
> email: [EMAIL PROTECTED]
-----Original Message-----
From: Tim Begley [mailto:[EMAIL PROTECTED]]
Sent: Monday, 27 November 2000 11:16
To: Cisco@Groupstudy. Com (E-mail)
Subject: Why a null sap in a LLC frame?
Could anyone explain why a sap would be set to 0x00 - what sort of situation
may require this?
thanks in advance
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