trouble understanding L2 protocol tunneling

From: Swan, Jay (jswan@sugf.com)
Date: Tue Mar 27 2007 - 13:10:09 ART

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I have the following physical topology:

R3---SwA---SwB---R5

R3 and R5 are in access vlan 35 with "l2protocol-tunnel cdp" on the
access ports.

If I configure the link between SwA and SwB in access vlan 35 with
"l2protocol-tunnel cdp", everything works fine: R3 and R5 see each other
as directly connected CDP neighbors. If I configure the link between SwA
and SwB as a hard-coded 802.1q trunk, however, the link is err-disabled
with an l2ptguard error.

I don't understand why this doesn't work with a trunk link. Thoughts?

Jay

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