This object indicates the desired spanning-tree mode of the system. The meaning of specific values is: avayaStpg(1) .. The older proprietary mode which supports multiple spanning tree groups. pvst(2) ........ Emulation of C***O spanning tree mode rstp(3) ........ IEEE 802.1w mode mstp(4) ........ IEEE 802.1s mode Note that depending on the current value of s5AgSysSpanningTreeOperMode and the value to which this object is set, the operational mode may be immediately changed, or the change may not take effect until the next system reboot.