C5/B5 f/w SFP+ Ports Lose Link after Pause Advertisement is Disabled

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Article ID: 14713 

C5-Series, firmware through
C5Kxxx-xx(P2) (2 SFP+ slots for 10GB-xx-SFPP or MGBIC-xxxx)
B5-Series, firmware through
B5Kxxx-xx(P2) (2 SFP+ slots for 10GB-xx-SFPP or MGBIC-xxxx) 

Used the 'clear port advertise <port#> pause' command to disable pause/flowcontrol advertisement on a "SFP+"-labeled port with installed 1Gb MGBIC-xxxx (9852).
A brief cycle of port link state is expected upon issuing this command. 

Ethernet link is lost on the SFP+ port, and does not return. 

Upgrade to firmware or higher (14480).
Release notes state, in the 'Changes and Enhancements in' section:
17175    Corrected an issue where "clear port advertise pause" would disable a 10Gb (tg) port.

Pre-upgrade workaround
After the problem has occurred; recovery requires re-enabling pause advertisement for affected ports, then resetting the switch.
Rather than port-disabling pause advertisement on a SFP+ port, globally disable flowcontrol ('set flowcontrol disable') on the switch.
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Posted 5 years ago

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