HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 113

Multiple Instance Spanning-Tree Operation 802.1s Multiple Spanning Tree Protocol (MSTP) MSTP BPDU (MSTP Bridge Protocol Data Unit): These BPDUs carry region-specific information, such as the region identifier (region name and revision number). If a switch receives an MSTP BPDU with a region identifier that differs from its own, then the port on which that BPDU was received is on the boundary of the region in which the switch resides. MSTP Bridge: In this manual, an MSTP bridge is a switch (or another 802.1scompatible device) configured for MSTP operation. MST Region: An MST region forms a multiple spanning tree domain and is a component of a single spanning-tree domain within a network. For switches internal to the MST region: ■ All switches have identical MST configuration identifiers (region name and revision number). ■ All switches have identical VLAN assignments to the region's IST and (optional) MST instances. ■ One switch functions as the designated bridge (IST root) for the region. ■ No switch has a point-to-point connection to a bridging device that cannot process RSTP BPDUs. RSTP - Rapid Spanning Tree Protocol, defined in IEEE 802.1w and ratified in IEEE 802.1D-2004. Spanning-tree - Generic term to refer to the many spanning-tree flavors: now deprecated STP, RSTP and VLAN-aware MSTP. STP - Spanning Tree Protocol, part of the original IEEE 802.1D specification. The 2004 edition completely deprecates STP. Both RSTP and MSTP have fallback modes to handle STP. SNMP - Simple Network Management Protocol, used to remotely manage network devices. 4-14