From: shiran guez (shiranp3@gmail.com)
Date: Wed Oct 31 2007 - 03:51:35 ART
hi
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12240se/scg/swtunnel.htm#wp1005050
If protocol tunneling is not enabled on IEEE 802.1Q tunneling ports, remote
switches at the receiving end of the service-provider network do not receive
the PDUs and cannot properly run STP, CDP, and VTP.
If IEEE 802.1Q tunneling is not used, you can still enable Layer 2 protocol
tunneling by connecting to the customer switch through access ports and by
enabling tunneling on the service-provider access port.
So basically what it is saying is that if you want to tunnel 2 access port
it will be ok to you the l2tunnel, but if you want to tunnel a trunk you
need to have the dot1q-tunnel mode.
side note: it do not meter if you run the trunk as ISL or dot1q inside the
dot1q-tunnel.
On 10/31/07, Gregory Gombas <ggombas@gmail.com> wrote:
>
> Can someone kindly explain why the solution guide has the interfaces
> configured as switchport mode dot1q-tunnel in addition to
> l2protocol-tunnel? Since the routers connected to the switch
> interfaces are not running 802.1q encapsulation, why is the
> dot1q-tunnel command needed?
>
> Wouldn't this task work equally well with just l2protocol-tunnel
> configured?
>
> Thanks,
> Greg
>
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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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