[c-nsp] MPLS over VLAN

[Samit]

Well...if the vpls tunnel is carrying a packets having a c-tag (c-vid)
and s-tag (s-vid/q-in-q), I am bittt.... confused that...the c-tag might
get override when in traverse through a MPLS backbone if two or more
MPLS router is connected via L2 802.1 vlanned switch??

But my understanding is it should not...because the c-tag and s-tag or
whatsoever like b-vid.....it..would be considered as a  payload when it
enters the MPLS network.Appreciate if someone comment or confirm this..

Regards,
Samit


David Hughes wrote:
> On 27/04/2010, at 7:32 AM, Paul Stewart wrote:
> 
>> We are getting ready to deploy some equipment (mixture of Cisco/Juniper)
>> that is MPLS capable.  We'd like to transport some VPLS traffic however in
>> the middle of a few of the links are layer2 switches - we've been told this
>> isn't possible even with 1600 MTU frame size supported.... Juniper is
>> telling us (in one particular segment) that we must hang MX gear in there to
>> make it work with MPLS... 
> 
> We run some EoMPLS vc's over MPLS links that traverse a layer2 only device.  No problems as long as the switch MTU can handle the packet size.  All our end-systems are connected at 1500 MTU so there's no issue as long as the L2 kit is recently new.
> 
> 
> David
> ...
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