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D-Link DHS-3224V Switch User’s Guide
67
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)
Highlight APPLY and press Enter to make the change effective.
Port Spanning Tree Settings
In addition to setting Spanning Tree parameters for use on the switch level, the DHS-3224V 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- 34. Port Spanning Tree Settings Screen
Toggle the View Ports:< > field to the range of ports to be configured. The ports are displayed for
configuration in groups of 12. Enter the port number or port range in the Configure Port from [ ] to [ ] field.
The Port Group STP parameters that can be configured are:
• Port Cost A Port Cost can be set from 1 to 65535. The lower the number, the greater the probability
the port will be chosen to forward packets.
• Priority A Port Priority can be from 0 to 255. The lower the number, the greater the probability the port
will be chosen as the Root Port.
Highlight APPLY and press Enter to make the change effective.