Chapter 6 Configuring STP and RSTP on the ML-Series Card

Configuring STP and RSTP Features

Configuring the Path Cost

The spanning-tree path cost default value is derived from the media speed of an interface. If a loop occurs, spanning tree uses cost when selecting an interface to put in the forwarding state. You can assign lower cost values to interfaces that you want selected first and higher cost values to interfaces that you want selected last. If all interfaces have the same cost value, spanning tree puts the interface with the lowest interface number in the forwarding state and blocks the other interfaces.

Beginning in privileged EXEC mode, follow these steps to configure the cost of an interface:

 

 

 

Command

Purpose

 

Step 1

 

 

 

ML_Series# configure terminal

Enters the global configuration mode.

Step 2

 

 

 

ML_Series(config)# interface

Enters the interface configuration mode and specifies an

 

 

 

interface-id

interface to configure.

 

 

 

 

Valid interfaces include physical interfaces and port-channel

 

 

 

 

logical interfaces (port-channelport-channel-number).

Step 3

 

 

 

ML_Series(config-if)#

Configures the cost for an interface that is an access port.

 

 

 

bridge-group

If a loop occurs, spanning tree uses the path cost when selecting

 

 

 

bridge-group-number path-cost

 

 

 

cost

an interface to place into the forwarding state. A lower path cost

 

 

 

 

represents higher-speed transmission.

 

 

 

 

For cost, the range is 0 to 65535; the default value is derived

 

 

 

 

from the media speed of the interface.

Step 4

 

 

 

ML_Series(config-if)# end

Returns to the privileged EXEC mode.

 

 

 

 

 

 

 

 

 

 

 

 

Note

The show spanning-tree interface interface-idprivileged EXEC command displays information only

 

 

 

for ports that are in a link-up operative state. Otherwise, you can use the show running-configprivileged

 

 

 

EXEC command to confirm the configuration.

 

 

 

 

 

 

To return the interface to its default setting, use the no bridge-groupbridge-group-numberpath-costcost command.

Configuring the Switch Priority of a Bridge Group

You can configure the switch priority and make it more likely that the switch will be chosen as the root switch.

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Cisco Systems 15310-MA, 15310-CL manual Configuring the Path Cost, Configuring the Switch Priority of a Bridge Group

15310-CL, 15310-MA specifications

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