Description: In SR mode, this object determines how this port behaves

when presented with a Spanning Tree Explorer frame. The

value 'disabled(2)' indicates that the port will not accept

or send Spanning Tree Explorer packets; any STE packets

received will be silently discarded. The value 'forced(3)'

indicates the port will always accept and propagate Spanning

Tree Explorer frames. This allows a manually configured

Spanning Tree for this class of packet to be configured.

Note that unlike transparent bridging, this is not

catastrophic to the network if there are loops.

The value 'auto-span(1)' can only be returned by a bridge

that both implements the Spanning Tree Protocol and has use

of the protocol enabled on this port. The behavior of the

port for Spanning Tree Explorer frames is determined by the

state of dot1dStpPortState. If the port is in the 'forwarding'

state, the frame will be accepted or propagated. Otherwise,

it will be silently discarded.

In TB mode, this object provides the means to statically

configure a port to forwarding/blocking modes. 'disabled(2)'

indicates that the port is statically configured to blocking

mode. 'forced(3)' indicates that the port is statically

configured to forwarding mode. 'auto-span(1)' indicates that

STP protocol is running.