Spanning Tree Protocols
5-3
5.3 Configuring STP
MSTP is much faster than STP. STP is only at an advantage if there is legacy equipment in the network
topology that does know how negotiate an MSTP cycle. If that is the case, then all of the network
equipment in the local network must use STP. To configure STP:
1. Set the switch priority and timing parameters.
2. Refine the port path costs, if needed.
5.3.1 Set Switch Priority and Timing Parameters
The STP configuration parameters are set using the CIST Configuration page.
1. Use the left menu to navigate to the CIST Configuration page (Spanning Tree > MSTP Config.
> CIST Config.).
2. If there is a switch that is closest to the WAN and therefore should be the favored root
switch, set the CIST Bridge Priority on that switch to a lower number (higher priority).
Usually, it will not be necessary to change the timing parameters for an STP switch. If desired, these
can also be set on this page. See Set the Configuration Timing Parameters on page 5-6 for an
explanation of the timing parameters.
3. Click on the Apply button at the bottom of the web page to record the changes.
Root Switch
Designated Switch
Designated Switch
Switch
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Switch
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Root Port
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Root Port
Root Port
Root Port
Root Port
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