Alcatel-Lucent OmniSwitch 6850-48 Cli Reference Manual page 470

output definitions (continued)
Role
Loop Guard
Note
page 7-148
The role of the port for this Spanning Tree instance. Possible port roles
are: ROOT - root, DIS - disable, DESG - designated, ALT - alternate,
MSTR - master (valid only when MSTP mode is active), and BKP -
backup.
Operational status of the loop-guard on a particular port or link
aggregate (ENA or DIS).
Indicates whether a loop-guard error (ERR) has occured on the MSTI
instance.
Distributed Spanning Tree Commands
OmniSwitch CLI Reference Guide June 2012