[mrmmills]

My apologies for my delayed reply, I just got back from lunch. If I click on the "View Full Map" then I get the message "Windows cannot create a network map for the selected type of network connection".

The location type is "Domain".

I do have a GPo set to allow LLDP, and confirmed it was applied via GPResult. The actual registry keys are:

HKLM\Software\Policies\Microsoft\Windows\LLTD!Enab leLLTDIO
HKLM\Software\Policies\Microsoft\Windows\LLTD!Allo wLLTDIOOnDomain
HKLM\Software\Policies\Microsoft\Windows\LLTD!Allo wLLTDIOOnPublicNet
HKLM\Software\Policies\Microsoft\Windows\LLTD!Proh ibitLLTDIOOnPrivateNet
and
HKLM\Software\Policies\Microsoft\Windows\LLTD!Enab leRspndr
HKLM\Software\Policies\Microsoft\Windows\LLTD!Allo wRspndrOnDomain
HKLM\Software\Policies\Microsoft\Windows\LLTD!Allo wRspndrOnPublicNet
HKLM\Software\Policies\Microsoft\Windows\LLTD!Proh ibitRspndrOnPrivateNet

I originally thought this might be that my SMC Layer 2 VLAN switch wasn't configured for LLDP so I put my XP client (with the Responder) and one of my Vista PC's on a dumb Linksys Hub (not a switch) but they still don't see each other with LLDP. I'm going to take another Vista PC from our domain and see if what happens when I place it on the same Hub as the 1st Vista PC.