Administrator Guide

Example of the name Command
To view the current region name and revision, use the show spanning-tree mst configuration command from EXEC Privilege
mode.
Dell(conf-mstp)#name my-mstp-region
Dell(conf-mstp)#exit
Dell(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 conguration 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
modication of MSTP parameters can negatively aect 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 congurations (especially those congurations with more ports) Dell Networking recommends
increasing the hello-time.
The range is from 1 to 10.
The default is 2 seconds.
3 Change the max-age parameter.
PROTOCOL MSTP mode
max-age seconds
The range is from 6 to 40.
The default is 20 seconds.
4 Change the max-hops parameter.
Multiple Spanning Tree Protocol (MSTP)
623