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Cisco Bug: CSCuj33916 - EoMPLS: MPLS Label does not copy COS from tunneled dot1q frame

Last Modified

Feb 13, 2018

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.2(4)S 15.3(3)S 15.4(1)S n/a

Description (partial)

Symptom:
For VC type 4 PW, Ethernet VLAN,  with single dot1q header packet, if one configure rewrite pop 1, expected situation is to copy COS from this header  into dummy tag. In reality, we hit a bug, when COS 0 is copied into dummy tag into CORE.

Conditions:
When transported traffic has outer vlan tag only, packet in MPLS core does NOT have copied priority field from dot1q header into MPLS EXP bits. Instead there is 0.
When transported traffic has outer vlan tag and some vlan tags (QinQ) , packet in MPLS core DOES have copied priority field from outer dot1q header into MPLS EXP bits.
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