Extreme Networks ExtremeWare XOS Command Reference Manual page 2009

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
ExtremeWare XOS Release 11.3 Command Changes
show ports statistics
show ports txerrors
unconfigure access-list
Deleted Commands for Release 11.3
The following are the commands that were deleted for ExtremeWare XOS release 11.3:
clear counters vlan
2009
ExtremeWare XOS 11.5 Command Reference Guide