[185865] in North American Network Operators' Group
Re: EoMPLS vlan rewrite between brands; possibly new bug in Cisco IOS
daemon@ATHENA.MIT.EDU (Jonas Bjork)
Sat Nov 14 21:04:16 2015
X-Original-To: nanog@nanog.org
From: Jonas Bjork <mr.jonas.bjork@me.com>
In-reply-to: <2D19A5EF-87DB-4B83-97BB-F54A4F3DF1AC@ericsson.com>
Date: Sun, 15 Nov 2015 03:02:00 +0100
To: Jeff Tantsura <jeff.tantsura@ericsson.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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:
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> Jonas,
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> As expected - the problem is related to vc type negotiation.
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> You have hit CSCuq28998 :)
> talk to your cisco rep=09
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> Workaround:
> - configure VC type 5 between the routers (configured on HP side)
> - configuring no-control-word=20
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> The bug has been reported in 15.2(4)S4a, perhaps there=E2=80=99s an =
image with the problem fixed.
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> Cheers,
> Jeff
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> On 11/14/15, 17:31, "Jonas Bjork" <mr.jonas.bjork@me.com> wrote:
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>> Dear Mr. Jeff,
>>=20
>> 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?
>>=20
>> 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#
>>=20
>> Anyone else: feel free to join in. Maybe we have any L2VC/PW ninjas =
watching.
>>=20
>> Best regards,
>> Jonas Bjork
>>=20
>>=20
>>> On 15 Nov 2015, at 1:26, Jeff Tantsura <jeff.tantsura@ericsson.com> =
wrote:
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>>> 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.
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>>> to my memory "show mpls l2 transport" should provide enough details.
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>>> Hope this helps
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>>> Regards,
>>> Jeff
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>>>> On Nov 14, 2015, at 4:50 AM, Jonas Bjork <mr.jonas.bjork@me.com> =
wrote:
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>>>> 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.
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>>>> 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
>>>> ...
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>>>> 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.
>>>>=20
>>>> Anyone heard of this issue or experienced it?
>>>>=20
>>>> Best regards,
>>>>=20
>>>> Jonas Bj=C3=B6rk
>>>> SNE, Europe/Sweden (hope you guys will help me anyway:)
>>=20
