S e n d c o m m e n t s t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
2-67
Cisco Nexus 5000 Series Command Reference
OL-16599-01
Chapter 2 Ethernet Commands
spanning-tree mst root
spanning-tree mst root
To designate the primary and secondary root and set the timer value for an instance, use the
spanning-tree mst root
command. To return to the default settings, use the
no
form of this command.
spanning-tree mst
instance-id
root
{
primary
|
secondary
}
[
diameter
dia
[
hello-time
hello-time
]]
no spanning-tree mst
instance-id
root
Syntax Description
Command Default
None
Command Modes
Configuration mode
Command History
Usage Guidelines
You can enter the
instance-id
argument as a single instance or a range of instances, for example,
0-3,5,7-9.
If you do not specify the
hello-time
argument, the argument is calculated from the network diameter.
You must first specify the
diameter
dia
keyword and argument before you can specify the
hello-time
hello-time
keyword and argument.
Examples
This example shows how to designate the primary root:
switch(config)#
spanning-tree mst 0 root primary
This example shows how to set the priority and timer values for the bridge:
switch(config)#
spanning-tree mst 0 root primary diameter 7 hello-time 2
instance-id
Instance identification number; the range of valid values is from 0 to 4094.
primary
Specifies the high priority (low value) that is high enough to make the bridge
root of the spanning-tree instance.
secondary
Specifies the switch as a secondary root, should the primary root fail.
diameter
dia
(Optional) Specifies the timer values for the bridge that are based on the
network diameter.
hello-time
hello-time
(Optional) Specifies the duration between the generation of configuration
messages by the root switch. The range is from 1 to 10 seconds; the default
is 2 seconds.
Release
Modification
4.0(0)N1(1a)
This command was introduced.
