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Cisco Bug: CSCvr99703 - C6K SUP2T VSS /QoS behavior during link oversubscription is different in 15.2(1)SY1 and 15.2(1)SY2

Last Modified

Dec 15, 2019

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.2(1.2)

Description (partial)

Symptom:
On oversubscription of a port where packet loss is expected, the latency values on the Traffic Class which is experiencing packet loss in 15.2(1)SY2 is much longer than in 15.2(1)SY1.


Traffic Class             Bandwidth      Loss %     Latency (old)     Latency (new)
-----------------        -----------    --------   ---------------   ---------------
BU  Traffic Class         250 Mbps         0            13 us             13 us
MM  Traffic Class         250 Mbps         0            13 us             13 us
RT  Traffic Class        1000 Mbps         0            13 us             13 us
NC  Traffic Class         100 Mbps         0            13 us             13 us
BE  Traffic Class        8000 Mbps       0.7             8 ms             80 milliseconds and increases constantly to Levels of about 2000 milliseconds

Conditions:
HW:
Chassis C6807-XL
VS-SUP2T-10G 
C6800-8P10G


Tested SW with issue:
15.2(1)SY2
15.2(1)SY3
15.2(1)SY5
15.5(1)SY1
15.5(1)SY4

Tested SW without issue:
15.2(1)SY1
15.2(1)SY1a
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