D-Link DGS-3224TG User Manual page 55

DGS-3224TG Gigabit Ethernet Switch User's Guide
The Spanning Tree Protocol (STP) operates on two levels: on the switch level, the settings are globally
implemented. On the port level, the settings are implemented on a per user-defined group basis.
Note: The factory default settings should cover the majority of installations. Therefore, it is
advisable to keep the default settings as set at the factory unless it is absolutely necessary
to change them.
The user-changeable parameters in the Switch are as follows:
•
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
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.
Figure 6-16. Configure Spanning Tree menu
] – The Hello Time can be set from 1 to 10 seconds. This is the interval
45