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Cisco Bug: CSCvv52461 - Double tag Q-Q: Inner vlan filter is not considering the vlan type (88A8/8100)

Last Modified

Aug 31, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.6.3.BASE

Description (partial)

Symptom:
In below Dot1Q+Dot1Q configuration, Frames with Dot1Q+Dot1ad also allowed.

 

RP/0/RP0/CPU0:ar18.BLB#sh run int Te0/0/0/19.4095

interface TenGigE0/0/0/19.4095 l2transport

encapsulation dot1q 200 second-dot1q 100

 

We are observing this behavior in version 6.6.3 and 7.1.2, and devices NCS 5501 and NCS 55A1

 
RP/0/RP0/CPU0:ar18.BLB#sh run int Te0/0/0/19.4095
interface TenGigE0/0/0/19.4095 l2transport
encapsulation dot1q 200 second-dot1q 100
rewrite ingress tag pop 1 symmetric

Conditions:
QinQ implementation in NCS devices
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