From: Josef A (josefnet@gmail.com)
Date: Wed Mar 28 2007 - 07:43:38 ART
Layer 2 protocol tunnelling only works with access ports or tunnel ports.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swtunnel.htm
On 3/27/07, Swan, Jay <jswan@sugf.com> wrote:
>
> 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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