Spanning-Tree Mst Hello-Time - Cisco Catalyst 3120 Command Reference Manual

Chapter 2 Cisco Catalyst Blade Switch 3120 for HP Cisco IOS Commands

spanning-tree mst hello-time

Use the spanning-tree mst hello-time global configuration command on the switch stack or on a
standalone switch to set the interval between hello bridge protocol data units (BPDUs) sent by root
switch configuration messages. Use the no form of this command to return to the default setting.
Syntax Description
seconds
Defaults
The default is 2 seconds.
Command Modes
Global configuration
Command History Release
12.2(40)EX
Usage Guidelines
After you set the spanning-tree mst max-age seconds global configuration command, if a switch does
not receive BPDUs from the root switch within the specified interval, the switch recomputes the
spanning-tree topology. The max-age setting must be greater than the hello-time setting.
Changing the spanning-tree mst hello-time command affects all spanning-tree instances.
Examples
This example shows how to set the spanning-tree hello time to 3 seconds for all multiple spanning-tree
(MST) instances:
Switch(config)# spanning-tree mst hello-time 3
You can verify your setting by entering the show spanning-tree mst privileged EXEC command.
Related Commands Command
show spanning-tree
spanning-tree mst
forward-time
spanning-tree mst max-age
spanning-tree mst max-hops
OL-12248-01
spanning-tree mst hello-time seconds
no spanning-tree mst hello-time
Interval between hello BPDUs sent by root switch configuration messages. The
range is 1 to 10 seconds.
Modification
This command was introduced.
mst
Description
Displays MST information.
Sets the forward-delay time for all MST instances.
Sets the interval between messages that the spanning tree receives
from the root switch.
Sets the number of hops in a region before the BPDU is discarded.
Cisco Catalyst Blade Switch 3120 for HP Command Reference
spanning-tree mst hello-time
2-645