Switch Configuration/Status

The Spanning Tree Switch Configuration/Status page contains fields for enabling STP (Spanning Tree Protocol) on the switch.

To access this page, click Switching > Spanning Tree > Switch in the navigation menu.

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Spanning Tree Switch Configuration Fields

Field Description
Spanning Tree Admin 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.
Force Protocol 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 can 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: MSTP (Multiple Spanning Tree Protocol) 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.
Configuration Name 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.
Configuration Revision Level The revision number of the MSTP region. This number must be the same on all switches that participate in the MSTP region.
Configuration Digest Key The 16 byte signature of type HMAC-MD5 (Message-Digest algorithm 5) created from the MST Configuration Table (a VLAN ID-to-MST ID mapping).
Configuration Format Selector The version of the configuration format being used in the exchange of BPDUs.