Spanning Tree Domain

An STPD is an STP (Spanning Tree Protocol) instance that contains one or more VLAN (Virtual LAN)s. The switch can run multiple STPDs, and each STPD has its own root bridge and active path. In the Extreme Networks implementation of STPD, each domain has a carrier VLAN (for carrying STP information) and one or more protected VLANs (for carrying the data).