Users Guide

Usage
Information
The MSTP determines the root bridge but you can assign one bridge a lower priority to increase the
probability it being the root bridge. A lower priority-value increases the probability of the bridge
becoming a root bridge. The no version of this command resets the value to the default.
Example
OS10(config)# spanning-tree mst 0 priority 0
OS10(config)# spanning-tree mst 2 root primary
Supported
Releases
10.2.0E or later
spanning-tree msti
Configures the MSTI, cost, and priority values for an interface.
Syntax
spanning-tree msti instance {cost cost | priority value}
Parameters
● msti instance — Enter the MST instance number, from 0 to 63. For Z9332F-ON platform, enter
a MST instance value from 0 to 61.
● cost cost — (Optional) Enter a port cost value, from 1 to 200000000. Default values:
○ 100 Mb/s Ethernet interface = 200000
○ 1-Gigabit Ethernet interface = 20000
○ 10-Gigabit Ethernet interface = 2000
○ Port-channel interface with one 100 Mb/s Ethernet = 200000
○ Port-channel interface with one 1 Gigabit Ethernet = 20000
○ Port-channel interface with one 10 Gigabit Ethernet = 2000
○ Port-channel with two 1 Gigabit Ethernet = 18000
○ Port-channel with two 10 Gigabit Ethernet = 1800
○ Port-channel with two 100 Mbps Ethernet = 180000
● priority value — Enter a value in increments of 16 as the priority, from 0 to 240, default 128.
Default Priority value is 128
Command Mode INTERFACE
Usage
Information
The cost value is based on the interface type. The greater the cost value, the less likely the port is
selected to be a forwarding port. The priority influences the likelihood that a port is selected to be a
forwarding port if several ports have the same cost value.
Example
OS10(conf-if-eth1/1/1)# spanning-tree msti 1 priority 0
OS10(conf-if-eth1/1/1)# spanning-tree msti 1 cost 3
Supported
Releases
10.2.0E or later
spanning-tree mst configuration
Enters MST mode to configure MSTP from Configuration mode.
Syntax
spanning-tree mst configuration
Parameters None
Default Disabled
Command Mode CONFIGURATION
Usage
Information
Use this command to enter STP MST configuration mode.
Example
OS10(config)# spanning-tree mst configuration
OS10(conf-mst)#
542 Layer 2