EoMPLS vlan rewrite between brands; possibly new bug in Cisco IOS 15

Sun Nov 15 00:26:49 UTC 2015

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 <mr.jonas.bjork at me.com> 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:)