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Configuring MSTP
How to Configure MSTP
Configuring the Optional MSTP Parameters
Before You Begin
Exercise care when configuring the switch priority. For most situations, we recommend that you use the spanning-tree
mst instance-id root primary and the spanning-tree mst instance-id root secondary global configuration commands
to modify the switch priority.
Command Purpose
1. configure terminal Enters global configuration mode.
2. spanning-tree mst instance-id root primary
[diameter net-diameter [hello-time seconds]]
Configures a switch as the root switch.
instance-id—Specifies 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 4096.
(Optional) diameter net-diameter—Specifies 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) hello-time seconds—Specifies the interval in
seconds between the generation of configuration
messages by the root switch. The range is 1 to 10
seconds; the default is 2 seconds.
3. spanning-tree mst instance-id root secondary
[diameter net-diameter [hello-time seconds]]
Configures a switch as the secondary root switch.
instance-id—Specifies 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 4096.
(Optional) diameter net-diameter—Specifies 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) hello-time seconds—Specifies the interval in
seconds between the generation of configuration
messages by the root switch. The range is 1 to 10
seconds; the default is 2 seconds.
Use the same network diameter and hello-time values that you
used when configuring the primary root switch.
4. end Returns to privileged EXEC mode.
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