MS Series User Guide
50
Mode
The administrative mode of STP on the device. When enabled, the
device participates in the root bridge election process and
exchanges Bridge Protocol Data Units (BPDUs) with other switches
in the spanning tree to determine the root path costs and maintain
topology information.
Version
The STP version the device uses, which is one of the following:
• IEEE 802.1d: Classic STP provides a single path between end
stations, avoiding and eliminating loops.
• IEEE 802.1w: Rapid Spanning Tree Protocol (RSTP) behaves like
classic STP but also has the ability to configure and recognize
full-duplex connectivity and ports that are connected to end
stations, resulting in rapid transitioning of the port to the
Forwarding state and the suppression of Topology Change
Notifications.
• IEEE 802.1s: Multiple Spanning Tree Protocol (MSTP) includes all
the advantages of RSTP and also supports multiple spanning tree
instances to efficiently channel VLAN traffic over different
interfaces. MSTP is compatible with both RSTP and STP.
The name of the MSTP region. Each switch that participates in the
same MSTP region must share the same Configuration Name,
Configuration Revision Level, and MST-to-VLAN mappings.
Level
The revision number of the MSTP region. This number must be the
same on all switches that participate in the MSTP region.
Key
The 16-byte signature of type HMAC-MD5 created from the MST
Configuration Table (a VLAN ID-to-MST ID mapping).
Selector
The version of the configuration format being used in the exchange
of BPDUs.
CST Configuration
Use the CST Configuration page to configure the Common Spanning Tree (CST) settings. The
settings and information on this page define the device within the spanning tree topology
that connects all STP/RSTP bridges and MSTP regions.
1. In the Spanning Tree screen, click the CST tab.
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