DES-3226 NWay Standalone Fast Ethernet Switch User’s Guide
•Status:<Disabled> – Toggle to Enabled to implement the Spanning Tree Protocol on the Switch.
•Max Age: [20] – The Maximum Age can be set from 6 to 40 seconds. At the end of the Max Age, if a BPDU has still not been received from the Root Bridge, your Switch will start sending its own BPDU to all other Switches for permission to become the Root Bridge. If it turns out that your Switch has the lowest Bridge Identifier, it will become the Root Bridge.
•Hello Time: [2 ] – The Hello Time can be set from 1 to 10 seconds. This is the interval between two transmissions of BPDU packets sent by the Root Bridge to tell all other Switches that it is indeed the Root Bridge. If you set a Hello Time for your Switch, and it is not the Root Bridge, the set Hello Time will be used if and when your Switch becomes the Root Bridge.
Note: The Hello Time cannot be longer than the Max. Age. Otherwise, a configuration error will occur.
•Forward Delay: [15] – The Forward Delay can be from 4 to 30 seconds. This is the time any port on the Switch spends in the listening state while moving from the blocking state to the forwarding state.
•Priority: [32768] – A Priority for the switch can be set from 0 to 65535. 0 is equal to the highest Priority. This number is used in the voting process between switches on the network to determine which switch will be the root switch. A low number indicates a high priority, and a high probability that this switch will be elected as the root switch.
Note: Observe the following formulas when setting the above parameters:
Max. Age ≤ 2 x (Forward Delay - 1 second)
Max. Age ≥ 2 x (Hello Time + 1 second)
Port Spanning Tree Settings
In addition to setting Spanning Tree parameters for use on the switch level, the Switch allows for the configuration of Spanning Tree Protocol on individual ports.
To define individual ports, highlight Port Settings on the Configure Spanning Tree menu above and press Enter.
Figure 6-19. Port Spanning Tree Settings screen
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