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Configuring STP
How to Configure STP
Configuring Port Priority
Configuring Path Cost
Configuring Optional STP Parameters
Before You Begin
Exercise care when configuring the priority, and hello time for STP.
For most situations, we recommend that you use the spanning-tree vlan vlan-id root primary and the spanning-tree
vlan vlan-id root secondary global configuration commands to modify the switch priority.
Command Purpose
1. configure terminal Enters global configuration mode.
2. interface interface-id Specifies an interface to configure, and enters interface
configuration mode.
Valid interfaces include physical ports and port-channel
logical interfaces (port-channel port-channel-number).
3. spanning-tree port-priority priority Configures the port priority for an interface.
4. spanning-tree vlan vlan-id port-priority priority Configures the port priority for a VLAN.
5. end Returns to privileged EXEC mode.
Command Purpose
1. configure terminal Enters global configuration mode.
2. interface interface-id Specifies an interface to configure, and enters interface
configuration mode. Valid interfaces include physical ports and
port-channel logical interfaces (port-channel
port-channel-number).
3. spanning-tree cost cost Configures the cost for an interface.
4. spanning-tree vlan vlan-id cost cost Configures the cost for a VLAN.
If a loop occurs, spanning tree uses the path cost when selecting
an interface to place into the forwarding state. A lower path cost
represents higher-speed transmission.
5. end Returns to privileged EXEC mode.
Command Purpose
1. configure terminal Enters global configuration mode.
2. spanning-tree vlan vlan-id priority priority Configures the switch priority of a VLAN.
3. spanning-tree vlan vlan-id hello-time seconds Configures the hello time of a VLAN.
4. spanning-tree vlan vlan-id max-age seconds Configures the maximum-aging time of a VLAN.
5. spanning-tree vlan vlan-id forward-time seconds Configures the forward time of a VLAN.
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