default encapsulation mode

In STP (Spanning Tree Protocol), default encapsulation allows you to specify the type of BPDU encapsulation to use for all ports added to a given STPD (Spanning Tree Domain), not just to one individual port. The encapsulation modes are:

• 802.1d—This mode is used for backward compatibility with previous STP versions and for compatibility with third-party switches using IEEE standard 802.1d.
• EMISTP—Extreme Multiple Instance Spanning Tree Protocol (EMISTP) mode is an extension of STP that allows a physical port to belong to multiple STPDs by assigning the port to multiple VLANs.
• PVST+—This mode implements PVST+ in compatibility with third-party switches running this version of STP.