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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 802.1s-
compatible 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:
â– 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.
â– One switch functions as the designated bridge (IST root) for the region.
â– 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.
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