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BGP control packets do not have dot1p or MPLS exp values with mpls next-hop enabled

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Information

 
TitleBGP control packets do not have dot1p or MPLS exp values with mpls next-hop enabled
Symptoms
BGP control traffic is not being prioritized properly, and is causing BGP packets to be dropped under port congestion.
Environment
  • EXOS 16.2+
  • BGP
  • 802.1p
  • MPLS exp values
  • MPLS next-hop enabled
Cause
Due to a bug in EXOS if you have MPLS next-hop enabled BGP control traffic will not be marked as "control traffic" with 802.1p or the MPLS exp bits. 
Resolution
  • CR# xos0076359 has been created for this issue and it will be fixed in EXOS 22.7 patch after 1-3, and EXOS 30.4.
  • Disabling MPLS next-hop will also correct this issue.
Additional notes

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