From: Mohammad Saeed (mzsaeed@gmail.com)
Date: Mon Feb 05 2007 - 17:14:16 ART
Ronnie and Patrik,
I appreciate you time and kind response, Thank you very much and I am
clear on this.
Thanks again.
Mohammad Zahed Saeed
On 2/5/07, Ronnie Angello <ronnie.angello@gmail.com> wrote:
> The customer side of the link is configured as a dot1q trunk. The provider
> end of the link is configured as a dot1q tunnel port. Frames coming into
> the provider switch from the customer switch are normal dot1q tagged frames
> with the appropriate customer vlan id. When the frames exit a trunk port
> into the provider's network they are double-tagged. That way no matter what
> customer vlan traffic is being forwarded through the provider's network,
> they are all tagged with the vlan id that is allocated to that customer.
>
> http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225sec/3550scg/swtunnel.htm#wp1005050
>
>
> On 2/5/07, Mohammad Saeed <mzsaeed@gmail.com> wrote:
> >
> > Hi Evereybody,
> >
> > When we configure this on an interface on 3550 switch:
> >
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> >
> > that interface will tag all the frames coming from respective vlans
> > except the native vlan.
> >
> > But when we create dot1q tunnel and we configure on one interface that
> > is connected to Customer site to provide dot1q tunneling:
> >
> > switchport mode dot1q-tunnel
> > switchport access-vlan 1000
> >
> > Now as this port will be receiving traffic from multiple vlans, will
> > this interface tag all traffic with VLAN ID 1000 (theoratically it
> > shall not as we are not giving switchport trunk encapsulation dot1q)
> > or leave the traffic tagged with its original vlan. I am not clear in
> > what format this interface will receiving the traffic, will that be
> > normal ethernet frame or ethernet frame tagged with vlan id using
> > dot1q encapsulation. If any one can expalin a little bit, I will
> > appreciate that.....
> >
> > To me it looks like, all traffic will already be encapsulated using
> > dot1q and this interface will mark those frames with VLAN ID 1000 and
> > will pass on to other end of dot1q tunnel.....
> >
> > Regards,
> >
> > Mohammad Zahed Saeed
> >
> >
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