D-Link 3250TG Product Manual - Page 63

STP Port Settings

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D-Link DES-3250TG Standalone Layer 2 Switch Bridge Hello Time (1-10 Sec) < 2 > Bridge Forward Delay (4-30 sec) Bridge Priority (065535 Sec) STP Version TX Hold Count(110) Forwarding BPDU Identifier, it will become the Root Bridge. The Bridge 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. The Bridge 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. A Bridge Priority for the switch can be set from 0 to 65535. 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. Choose rstp or StpCompatibility. Both versions use STP parameters in the same way. RSTP is fully compatible with IEEE 802.1d STP and will function with legacy equipment. This is the maximum number of Hello packets transmitted per interval. The count can be specified from 1 to 10. The default value is 3. This allows you to control whether or not to forward Bridge Protocol Data Units. Disabling this setting can be useful if, for example, the present switch has been designated as the root bridge and you do not want that status to change. 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) STP Port Settings 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 user-defined Group of ports basis. 55

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D-Link DES-3250TG Standalone Layer 2 Switch
Identifier, it will become the Root
Bridge.
Bridge Hello Time
(1-10 Sec) <
2
>
The Bridge 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.
Bridge Forward
Delay (4-30 sec)
<
15
>
The Bridge 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.
Bridge Priority (0-
65535 Sec)
<
32768
>
A Bridge Priority for the switch can
be set from
0
to
65535
. 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
Choose
rstp
or
StpCompatibility
. 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(1-
10)
This is the maximum number of
Hello
packets
transmitted
per
interval. The count can be specified
from
1
to
10
. The default value is
3.
Forwarding BPDU
<
Enabled
>
This allows you to control whether or
not to forward Bridge Protocol Data
Units. Disabling this setting can be
useful if, for example, the present
switch has been designated as the
root bridge and you do not want that
status to change.
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)
STP Port Settings
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 user-defined Group of ports basis.
55