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

[Jonas Bjork <mr.jonas.bjork () me com>]

Thank you Jeff, I'll check it out on the HP side since Cisco seems to not care:

Known Fixed Releases:   (0)
No release planned to fix this bug

Best regards,
Jonas Bjork


> On 15 Nov 2015, at 2:54, Jeff Tantsura <jeff.tantsura () ericsson com> wrote:
>
> Jonas,
>
> As expected - the problem is related to vc type negotiation.
>
> You have hit CSCuq28998 :)
> talk to your cisco rep        
>
> Workaround:
> - configure VC type 5 between the routers (configured on HP side)
> - configuring no-control-word 
>
>
> The bug has been reported in 15.2(4)S4a, perhaps there’s an image with the problem fixed.
>
> Cheers,
> Jeff
>
>
>
>
> On 11/14/15, 17:31, "Jonas Bjork" <mr.jonas.bjork () me com> wrote:
>
> > Dear Mr. Jeff,
> >
> > Thank you for your reply. Below is the complete output in question (l2 is short for l2transport).
> > You are mentioning platform capabilities and that the default might have changed. How do I alter this?
> >
> > pe#sh mpls l2 vc 42 d
> > Local interface: Po190.42 up, line protocol up, Eth VLAN 42 up
> > Destination address: X.X.1.89, VC ID: 42, VC status: down
> >   Last error: Imposition VLAN rewrite capability mismatch with peer
> >   Output interface: none, imposed label stack {}
> >   Preferred path: not configured
> >   Default path: no route
> >   No adjacency
> > Create time: 00:00:59, last status change time: 00:31:40
> >   Last label FSM state change time: 00:00:18
> >   Last peer autosense occurred at: 00:00:18
> > Signaling protocol: LDP, peer X.X.1.89:0 up
> >   Targeted Hello: X.X.0.2(LDP Id) -> X.X.1.89, LDP is UP
> >   Graceful restart: not configured and not enabled
> >   Non stop routing: not configured and not enabled
> >   Status TLV support (local/remote)   : enabled/not supported
> >     LDP route watch                   : enabled
> >     Label/status state machine        : remote invalid, LruRnd
> >     Last local dataplane   status rcvd: No fault
> >     Last BFD dataplane     status rcvd: Not sent
> >     Last BFD peer monitor  status rcvd: No fault
> >     Last local AC  circuit status rcvd: No fault
> >     Last local AC  circuit status sent: DOWN PW(rx/tx faults)
> >     Last local PW i/f circ status rcvd: No fault
> >     Last local LDP TLV     status sent: No fault
> >     Last remote LDP TLV    status rcvd: Not sent
> >     Last remote LDP ADJ    status rcvd: No fault
> >   MPLS VC labels: local 242, remote 1199
> >   Group ID: local 0, remote 0
> >   MTU: local 9216, remote 9216
> >   Remote interface description:
> >   Remote VLAN id: 42
> > Sequencing: receive disabled, send disabled
> > Control Word: Off (configured: autosense)
> > SSO Descriptor: X.X.1.89/42, local label: 242
> > Dataplane:
> >   SSM segment/switch IDs: 0/0 (used), PWID: 142
> > VC statistics:
> >   transit packet totals: receive 0, send 0
> >   transit byte totals:   receive 0, send 0
> >   transit packet drops:  receive 0, seq error 0, send 0
> > pe#
> >
> > Anyone else: feel free to join in. Maybe we have any L2VC/PW ninjas watching.
> >
> > Best regards,
> > Jonas Bjork
> >
> >
> > > On 15 Nov 2015, at 1:26, Jeff Tantsura <jeff.tantsura () ericsson com> wrote:
> > >
> > > 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 () 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:)