By default, the ExtremeXOS software advertises this TLV whenever you enable LLDP on a port, but you can disable advertisement. This TLV advertises show version command information similar to the following in the system description TLV:
ExtremeXOS version 11.2.0.12 v1120b12 by release-manager on Fri Mar 18 16:01:08 PST 2005
To control advertisement of the system description TLV, use the following command:
configure lldp ports [all | port_list] [advertise | no-advertise] system-description