Been forever since i looked at cisco, however sounds like vc type mismatch. 
They used to have it as a platform capability, perhaps SW upgrade changed the 
default.

to my memory "show mpls l2 transport" should provide enough details.

Hope this helps

Regards,
Jeff

> On Nov 14, 2015, at 4:50 AM, Jonas Bjork <[email protected]> wrote:
> 
> Hi, I am using a couple of AToM/EoMPLS tunnels in order to carry customer 
> voice and data traffic across our IP/MPLS core, and it is currently working 
> just fine. The first side consists of a Cisco 7600 router (rsp) and the other 
> one is an HP A5500-HI routing switch with full LER/E-LSR capability. At the 
> HP site, the tunnels are facing the access ports towards our premium 
> end-customers; and on the Cisco PE I terminate the tunnels on one of the 
> 2x10GE portchannel backbone links. There is vlan X on the HP side and vlan Y 
> on the Cisco side - vlan rewrite is working perfectly - as long as I use IOS 
> 12.
> 
> After upgrading the Cisco router software to IOS 15 the tunnels won't come 
> up. sh mpls l2 vc Y d says:
> ...
> Last error: Imposition VLAN rewrite capability mismatch with peer
> ...
> 
> I use almost exactly the same Cisco configuration before and after the 
> upgrade (only minor changes and nothing related to this) and I havn't touched 
> the HP. Apparently they don't talk the same L2PW language. I wonder though, 
> why now? We use service instances on the HP switchport as endpoint, we 
> initiate the targetted LDP session in addition to the pseudowire handshake 
> from a sub interface MPLS crossconnect. There is no MTU mismatch; not here - 
> not anywhere.
> 
> Anyone heard of this issue or experienced it?
> 
> Best regards,
> 
> Jonas Björk
> SNE, Europe/Sweden (hope you guys will help me anyway:)

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