Connectivity Guide

If the timer is set to a non-zero value, instance-based flushing occurs based on the MAC flush threshold
value. The no version of this command resets the flush-interval timer to the default value.
Example
OS10(config)# spanning-tree mac-flush-timer 500
OS10(config)# no spanning-tree mac-flush-timer
Supported
Releases
10.4.3.0 or later
spanning-tree mode
Enables an STP type: RSTP, Rapid-PVST+, or MST.
Syntax
spanning-tree mode {rstp | mst | rapid-pvst}
Parameters
● rstp — Sets STP mode to RSTP.
● mst — Sets STP mode to MST.
● rapid-pvst — Sets STP mode to RPVST+.
Default RPVST+
Command Mode CONFIGURATION
Usage
Information
All STP instances stop in the previous STP mode, and restart in the new mode. You can also change to
RSTP/MST mode.
Example (RSTP)
OS10(config)# spanning-tree mode rstp
Example (MST)
OS10(config)# spanning-tree mode mst
Supported
Releases
10.2.0E or later
spanning-tree mst
Configures an MST instance and determines root and bridge priorities.
Syntax
spanning-tree mst instance number priority | root {primary | secondary}
Parameters
● instance number — Enter an MST instance number, from 0 to 63.
● priority priority value — Set a bridge priority value in increments of 4096, from 0 to 61440.
Valid priority values are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960,
45056, 49152, 53248, 57344, and 61440. All other values are rejected.
● root — Enter a primary or secondary root.
● primary — Enter a device as a primary root.
● secondary — Enter a device as a secondary root.
Default Not configured
Command Mode CONFIGURATION
Usage
Information
The MSTP determines the root bridge but you can assign one bridge a lower priority to increase the
probability it being the root bridge. A lower priority-value increases the probability of the bridge
becoming a root bridge. The no version of this command resets the value to the default.
Example
OS10(config)# spanning-tree mst 0 priority 0
OS10(config)# spanning-tree mst 2 root primary
Supported
Releases
10.2.0E or later
Layer 2 319