From: getmo1 (getmo1@126.com)
Date: Thu Feb 15 2007 - 03:46:21 ART
Thanks for the valued answer and documents.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ronnie Angello
Sent: Tuesday, February 06, 2007 3:26 AM
To: Mohammad Saeed
Cc: Cisco certification
Subject: Re: dot1q tunnel mode
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/s
wtunnel.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
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Thu Mar 01 2007 - 07:38:46 ART