To display the Spanning Tree Switch Configuration/Status page, click
Switching
>
Spanning Tree
>
Switch
in the navigation menu.
Table 229: 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 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 –
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.
•
If you make any configuration changes, click
Submit
to apply the new settings to the switch.
•
Click
Refresh
to update the information on the screen with the most current data.
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
/
regions.
To display the CST Configuration page, click
Switching
>
Spanning Tree
>
CST
in the navigation menu.
Table 230: Spanning Tree CST Fields
Field
Description
Bridge Priority
The value that helps determine which bridge in the spanning tree is elected as
the root bridge during STP convergence. A lower value increases the probability
that the bridge becomes the root bridge.
Bridge Max Age
The amount of time a bridge waits before implementing a topological change.
Configuring Switching Information
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