[c-nsp] Trunked links over EoMPLS

Temkin, David temkin at sig.com
Thu Nov 4 11:54:53 EST 2004


I was able to use layer 2/VLAN xconnect (l2tvp3 and AToM flavors)  to do
this with an ISL trunk, but not 802.1q. 

Not sure if this fits your need, but...

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of 
> McCallum, Robert
> Sent: Thursday, November 04, 2004 11:25 AM
> To: 'Chris Roberts'; cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] Trunked links over EoMPLS
> 
> Chris,  this is called QinQ.  However,  all that you can do 
> is a dot1q trunk between the devices i.e. NO ISL.  ISL 
> doesn't work (or at least didn't a week ago when we tested 
> it).  If your switch is a 3550 the config looks like this.
> 
> 
> int fast0/1
> switchport dot1qtunnel
> switchport trunk allowed vlan blah blah blah.
> switchport access vlan xx (this is the vlan number for your network)
> 
> you can then do l2protocol tunnel cdp,stp or vtp.  This 
> command will allow total transparency.
> 
> 
> BTW if spanning tree is enabled for vlans then the customer 
> shall see the vlan that you need to use to encapsulate their 
> packets into.
> 
> HTH
> 
> Robert McCallum
> CCIE #8757 R&S
> 
> 
> > -----Original Message-----
> > From: Chris Roberts [mailto:croberts at bongle.co.uk] 
> > Sent: 04 November 2004 14:02
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] Trunked links over EoMPLS
> > 
> > 
> > Heya,
> > 
> > I have a customer with a bunch of VLANs on a switch - I want 
> > to enable a trunk link on this switch and carry the entire 
> > trunk across a point-to-point L2VPN to a remote switch which 
> > will also have trunking enabled. Is this possible? The 
> > documents on Cisco seem to indicate that I need to have 
> > stacked VLAN processing and such, is this necessary? I don't 
> > want to do anything complicated like send different VLANs to 
> > different places and such, just encapsulate the entire L2 
> > frames including 802.1q / ISL headers.
> > 
> > Cheers,
> > Chris.
> > 
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