Cisco MWR 2941 Router Command Reference, Release 15.0(1)MR
spanning-tree mst root
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Cisco MWR 2941 Router Command Reference, Release 15.0(1)MR
OL-23890-01
spanning-tree mst root
To designate the primary and secondary root, set the bridge priority, and set the timer value for an
instance, use the spanning-tree mst root command in global configuration mode. To return to the
default settings, use the no form of this command.
spanning-tree mst instance root {primary | secondary} [diameter diameter [hello-time time]]
no spanning-tree mst root
Syntax Description
Command Default None
Command Modes Global configuration (config)
Command History
Usage Guidelines You can enter instance as a single instance or a range of instances; for example, 0-3,5,7-9.
The spanning-tree mst root secondary bridge priority value is 16384.
The diameter diameter and hello-time time keywords and arguments are available for instance 0 only.
If you do not specify the time argument, the value for it is calculated from the network diameter.
Examples This example shows how to set the priority and timer values for the bridge:
Router(config)# spanning-tree mst 0 root primary diameter 7 hello-time 2
Router(config)# spanning-tree mst 5 root primary
Router(config)#
instance Instance identification number; valid values are from 0 to 4094.
primary Specifies the high enough priority (low value) to make the bridge root of the
spanning-tree instance.
secondary Specifies the switch as a secondary root, should the primary root fail.
diameter
diameter
(Optional) Specifies the timer values for the bridge that are based on the network
diameter; valid values are from 1 to 7.
hello-time time (Optional) Specifies the duration between the generation of configuration messages
by the root switch.
Release Modification
12.2(14)SX Support for this command was introduced on the Supervisor Engine 720.
12.2(17d)SXB Support for this command on the Supervisor Engine 2 was extended to
Release 12.2(17d)SXB.
15.0(1)MR This command was integrated into 15.0(1)MR.
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