14.
Multiple Spanning Tree Protocol (MSTP)
MN700004 Rev 01
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NOTE
The apply command has the same effect as the exit command, or the shortcut key
<Ctrl+D>.
Command Syntax
device-name
(cfg protocol mstp)#
apply
Setting the Hello Time
The
mstp hello-time
command, in Protocol Configuration mode, configures hello time for all
MST instances. The
no
form of this command resets the hello time to its default setting.
The hello time is the interval between the generations of configuration messages by the root
switch. These messages indicate that the switch is alive.
By default, the hello time value is 2 seconds.
Command Syntax
device-name
(cfg protocol)#
mstp hello-time
<
seconds
>
device-name
(cfg protocol)#
no mstp hello-time
Argument Description
seconds
The MSTP hello time in seconds. The range is <1-10>.
Setting the Forward Delay Time
The
mstp forward-delay
command, in Protocol Configuration mode, configures the forward
time for all MST instances. The
no
form of this command resets the value to its default.
The forward delay is the number of seconds a port waits before changing from its spanning-
tree learning and listening states to the forwarding state.
By default, the forward delay time is 15 seconds.
Command Syntax
device-name
(cfg protocol)#
mstp forward-delay
<
seconds
>
device-name
(cfg protocol)#
no mstp forward-delay
Argument Description
seconds
The RSTP forward delay time in seconds. The range is <4-30>.
Setting the Maximum Aging Time
The
mstp max-age
command, in Protocol Configuration mode, configures the maximum-
aging time for all MST instances. The
no
form of this command resets the time value to its
default setting.
The maximum-aging time is the number of seconds a switch waits without receiving
spanning-tree configuration messages before attempting a reconfiguration.
By default, the time value is 20 seconds.