Spanning-Tree Mst Root - Cisco ME 3400 Command Reference Manual

spanning-tree mst root

spanning-tree mst root
Use the spanning-tree mst root global configuration command to configure the multiple spanning-tree
(MST) root switch priority and timers based on the network diameter. Use the no form of this command
to return to the default settings.
Syntax Description instance-id
root primary
root secondary
diameter net-diameter
hello-time seconds
Defaults The primary root switch priority is 24576.
The secondary root switch priority is 28672.
The hello time is 2 seconds.
Command Modes
Global configuration
Command History Release
12.2(25)EX
12.2(25)SEG
Usage Guidelines
Spanning Tree Protocol (STP) is not supported on user network interfaces (UNIs); it is only supported
on network node interfaces (NNIs) or on enhanced network interfaces (ENIs) on which STP has been
enabled. To set a port as an ENI or NNI, enter the port-type {eni | nni} interface configuration
command. To enable STP on an ENI, enter the spanning-tree interface configuration command.
Use the spanning-tree mst instance-id root command only on backbone switches.
Cisco ME 3400 Ethernet Access Switch Command Reference
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spanning-tree mst instance-id root {primary | secondary} [diameter net-diameter
[hello-time seconds]]
no spanning-tree mst instance-id root
Range of spanning-tree instances. You can specify a single instance, a range
of instances separated by a hyphen, or a series of instances separated by a
comma. The range is 0 to 4094.
Force this switch to be the root switch.
Set this switch to be the root switch should the primary root switch fail.
(Optional) Set the maximum number of switches between any two end
stations. The range is 2 to 7. This keyword is available only for MST
instance 0.
(Optional) Set the interval between hello bridge protocol data units
(BPDUs) sent by the root switch configuration messages. The range is 1 to 10
seconds. This keyword is available only for MST instance 0.
Modification
This command was introduced.
The instance-id range changed to 0 to 4094.
Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
OL-9640-10