Reference Guide

Changing the Region Name or Revision
To change the region name or revision, use the following commands.
• Change the region name.
PROTOCOL MSTP mode
name name
• Change the region revision number.
PROTOCOL MSTP mode
revision number
To view the current region name and revision, use the show spanning-tree mst configuration command
from EXEC Privilege mode.
Example of the name Command
FTOS(conf-mstp)#name my-mstp-region
FTOS(conf-mstp)#exit
FTOS(conf)#do show spanning-tree mst config
MST region name: my-mstp-region
Revision: 0
MSTI VID
1 100
2 200-300
Modifying Global Parameters
The root bridge sets the values for forward-delay, hello-time, max-age, and max-hops and overwrites the values set on
other MSTP bridges.
• Forward-delay — the amount of time an interface waits in the Listening state and the Learning state before it
transitions to the Forwarding state.
• Hello-time — the time interval in which the bridge sends MSTP bridge protocol data units (BPDUs).
• Max-age — the length of time the bridge maintains configuration information before it refreshes that information
by recomputing the MST topology.
• Max-hops — the maximum number of hops a BPDU can travel before a receiving switch discards it.
NOTE: Dell Networking recommends that only experienced network administrators change MSTP parameters.
Poorly planned modification of MSTP parameters can negatively affect network performance.
To change the MSTP parameters, use the following commands on the root bridge.
1. Change the forward-delay parameter.
PROTOCOL MSTP mode
forward-delay seconds
The range is from 4 to 30.
The default is 15 seconds.
2. Change the hello-time parameter.
PROTOCOL MSTP mode
hello-time seconds
NOTE: With large configurations (especially those configurations with more ports) Dell Networking
recommends increasing the hello-time.
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