STP configuration guidelines and restrictions

Follow these configuration guidelines and restrictions when configuring STP and STP variants:

• Only one form of a standing tree protocol, such as STP or RSTP, can be enabled at a time. You must disable one form of xSTP before enabling another.
• When any form of STP is enabled globally, that form of STP is enabled by default on all switch ports.
• LAGs are treated as normal links for any form of STP.
• The STP is disabled by default on the SLX device. Thus, any new VLANs you configure on the SLX device have STP disabled by default.
• PVST/RPVST BPDUs are flooded only if PVST/RPVST is not enabled. STP/RSTP (IEEE) BPDUs are never flooded if STP/RSTP is not enabled.