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Cisco NEXUS 93240 drops labeled mpls traffic

ilircisco
Beginner
Beginner

Hello 

I am using Cisco NEXUS switches only for switching 

I have issues with   MPLS labeled traffic passing through NEXUS 93240 . Seems that the switch drop the labeled mulicast traffic .The vpls-xconnect between the PE routers is UP ,but no traffic passing .When try vpls between two PE that are directly connected at  the nexus switches ,the service works OK   (here the mpls traffic is unlabeled --the PHP option)

 

the version of the swicth is /nxos.9.3.3.bin

 

The previous 9396 models have worked perfect .No issues passing the mpls traffic 

 

 

Regards 

Ilir

6 Replies 6

balaji.bandi
VIP Guru VIP Guru
VIP Guru

Since you mentioned old nexus model works find, what was the version it was worked ?

 

May be 9.3 may have bug, do you see any errors or any etheranalyze traffic logs to capture.

 

suggest to look below guide see any limitations :

 

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/label-switching/b-cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-93x/b-cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-93x_chapter_011.htm...

 

try debug or capture the logs :

 

https://community.cisco.com/t5/networking-documents/using-ethanalyzer-on-nexus-platform-for-control-plane-and-data/ta-p/3142665

 

 

BB

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mkorourke
Beginner
Beginner

hi @ilircisco did you ever end up finding a resolution to this in 9.3(x)?

Hello

That version had problems passing the MPLS labeled packets . That caused a lot of problems ,because the switch was for switching the PE routers MPLS traffic and all the L2/L3 mpls circuits were affected.

 

The version 9.3.9 is OK now 

 

Regards 

Ilir 

Jitendra Kumar
Rising star
Rising star

Hi,

 

Here is the some steps that can help you.

by default features are disabled hope you have enable it..

Default Settings for MPLS Layer 3 VPNs

Table 1. Default MPLS Layer 3 VPN ParametersParametersDefault

L3VPN feature

Disabled

L3VPN SNMP notifications

Disabled

allowas-in (for a hub-and-spoke topology)

0

disable-peer-as-check (for a hub-and-spoke topology)

Disabled

Follow below guide..

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/label-switching/b-cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-93x/b-cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-93x_chapter_0101.ht...

 

 

 

Thanks,
Jitendra

Thanks @Jitendra Kumar appreciated. I'll check it out and see if there are any notes or configuration items that may assist.

Re-checking over the bug tracker there seems to be a few bugs relating to NX-OS and MPLS labelled traffic being dropped on transit or pass-through. CSCvr31693 seems to be a good hit for early 9.3(x) releases, I'm preparing a small POC to confirm if it corrects the issue.

Cheers,

Mick

seems you are not on the affected release as your device firmware are 9.3.3 bug has been fixed in this release, its affected 9.3.1. As per the bug details.

Thanks,
Jitendra
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