The administrative state of STP within a spoke-SDP controls how BPDUs are transmitted and handled when received. The allowable states are:
Spoke-SDP Admin Up
The default administrative state is up for STP on a spoke-SDP. BPDUs are handled in the normal STP manner on a spoke-SDP that is administratively up.
Spoke-SDP Admin Down
An administratively down state allows a service provider to prevent a spoke-SDP from becoming operationally blocked. BPDUs do not originate out the spoke-SDP toward the customer.
If STP is enabled on VPLS level, but disabled on the spoke-SDP, received BPDUs are discarded. Discarding the incoming BPDUs allows STP to continue to operate normally within the VPLS service while ignoring the down spoke-SDP. The specified spoke-SDP is always in an operationally forwarding state.
The administratively down state allows a loop to form within the VPLS.
CLI syntax:
config>service>vpls>spoke-sdp>stp#
[no] shutdown