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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.
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.
PROTOCOL MSTP mode
max-hops number
The range is from 1 to 40.
The default is 20.
Example of the forward-delay Parameter
To view the current values for MSTP parameters, use the show running-config spanning-tree
mstp
command from EXEC privilege mode.
Dell(conf-mstp)#forward-delay 16
Dell(conf-mstp)#exit
Dell(conf)#do show running-config spanning-tree mstp
!
protocol spanning-tree mstp
no disable
name my-mstp-region
MSTI 1 VLAN 100
MSTI 2 VLAN 200-300
forward-delay 16
MSTI 2 bridge-priority 4096
Dell(conf)#
Modifying the Interface Parameters
You can adjust two interface parameters to increase or decrease the probability that a port becomes a
forwarding port.
• Port cost is a value that is based on the interface type. The greater the port cost, the less likely the
port is selected to be a forwarding port.
Multiple Spanning Tree Protocol (MSTP)
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