D-Link DGS-3224SR, Руководство пользователя, Страница: 68 / 140

D-Link DGS-3224SR Layer 2 Gigabit Ethernet Switch
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Configure the following parameters and click the Apply button to implement them:
Parameter Description
Status < Disabled >
This field can be toggled between Enabled and Disabled using the pull-
down menu. This will enable or disable the Spanning Tree Protocol (STP),
globally, for the switch.
Max Age: (6 - 40 sec)
< 20 >
The Max. 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: (1 - 10
sec)
< 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.
Forward Delay: (4 -
30 sec)
< 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: (0 - 61440)
< 32768 >
A Priority for the switch can be set from 0 to 61440. 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.
STP Version < RSTP >
Choose RSTP (default) or STP Compatibility. Both versions use STP
parameters in the same way. RSTP is fully compatible with IEEE 802.1d
STP and will function with legacy equipment.
Tx Hold Count < 3 >
This is the maximum number of Hello packets transmitted per interval. The
count can be specified from 1 to 10. Default value = 3.
Forwarding BPDU
< Enabled >
This can enabled or disabled. When it is enabled it allows the forwarding of
STP BPDU packets from other network devices when STP is disabled on
the switch. The default is enabled.
Note: the Hello Time cannot be longer than the Max. Age. Otherwise, a configuration error will occur.
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)