ES3000 Advanced Concept Guide
5-6
5.5 Configuring MSTP and CIST
The process of configuring a switch for MSTP consists of the following steps:
1. Enable and define an MSTP configuration.
2. Set the timing parameters for the configuration.
3. If desired, define special tuning characteristics for the ports in the switch.
4. Assign the VLANS on the switch to individual MSTP instances.
5.5.1 Enable and Define MSTP Configuration
1. Use the left menu to navigate to the Multiple Spanning Tree Configuration page (Spanning
Tree > MSTP Config. > MSTP Config.).
2. Set the Global MSTP Status to Enabled and press the Apply button to the right.
3. Set the Protocol Version to MSTP and press the Apply button to the right.
4. Set the MSTP Config ID Selection to a number between 1 and 255.
5. Set the MSTP Configuration Name to a string, 32 characters or less, for example
“Warehouse Wireless Network.”
6. Set the MSTP Revision Level to an integer between zero and 65535. Most network
administrators will start with one and increment it each time the MSTP configuration has to
change.
7. Note the last three settings carefully. They must be identical on all switches that participate
in this MSTP configuration.
8. Click on the Apply button beneath the MSTP configuration choices.
5.5.2 Set the Configuration Timing Parameters
The CIST timing parameters determine how long it will take to converge on the initial spanning tree
and any similar complete reconfiguration. The parameters are:
• Hello Time: The interval between hello messages broadcast from one switch to the others.
These messages are used to determine when a switch has gone down and a spanning tree
reconfiguration is needed. Shorter intervals use up more bandwidth and allow faster
response to failures. Default: 2 seconds.
• Maximum Age: How long forwarding information is retained in a switch before it is
considered outdated and must be relearned. Shorter periods use up more bandwidth but
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