SAP STP administrative state

The administrative state of STP within a SAP controls how BPDUs are transmitted and handled when received. The allowable states are:

• SAP Admin Up

  The default administrative state is up for STP on a SAP. BPDUs are handled in the normal STP manner on a SAP that is administratively up.

• SAP Admin Down

  An administratively down state allows a service provider to prevent a SAP from becoming operationally blocked. BPDUs do not originate out the SAP toward the customer.

  If STP is enabled on VPLS level, but disabled on the SAP, received BPDUs are discarded. Discarding the incoming BPDUs allows STP to continue to operate normally within the VPLS service while ignoring the down SAP. The specified SAP is always in an operationally forwarding state.

  Note: The administratively down state allows a loop to form within the VPLS.

CLI syntax:

config>service>vpls>sap>stp# 
[no] shutdown

Range

shutdown or no shutdown

Default

no shutdown (SAP admin up)