Chapter 5
Configuring the Switch
37
48-Port 10/100 + 4-Port Gigabit Switch with WebView and Power over Ethernet
Spanning Tree Type Specifies the type of spanning tree
used on the Switch:
STP Spanning Tree Protocol (IEEE 802.1D); i.e., when
this option is selected, the Switch will use RSTP set to
STP forced compatibility mode).
RSTP Rapid Spanning Tree Protocol (IEEE 802.1w).
RSTP is the default.
MSTP Multiple Spanning Tree Protocol (IEEE 802.1s).
BPDU Handling The maximum transmission rate for
BPDUs is specified by setting the minimum interval
between the transmission of consecutive protocol
messages. Select the transmission rate from the drop-
down menu. (Range: 1-10; Default: 3)
Path Cost Method The path cost is used to determine the
best path between devices. The path cost method is used
to determine the range of values that can be assigned to
each interface. Select the method from the drop-down
menu.
Long Specifies 32-bit based values that range from 1-
200,000,000.
Short Specifies 16-bit based values that range from
1-65535.
Priority Bridge priority is used in selecting the root
device, root port, and designated port. The device with the
highest priority becomes the STA root device. However,
if all devices have the same priority, the device with the
lowest MAC address will then become the root device.
NOTE: Lower numeric values indicate higher
priority.
Enter a value for the bridge priority into the Priority text
field. The value must be within the range below and in
steps of 4096. A full list of valid values are provided below.
(see Options)
Default: 32768
Range: 0-61440, in steps of 4096
Options: 0, 4096, 8192, 12288, 16384, 20480, 24576,
28672, 32768, 36864, 40960, 45056, 49152, 53248,
57344, 61440
Hello Time Interval (in seconds) at which the root device
transmits a configuration message. To enable Hello Time
click the Hello Time option and enter the required interval
value in the Hello Time field.
Default: 2
Minimum: 1
Maximum: The lower of 10 or [(Max. Message Age / 2) -1]
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Maximum Age The maximum time (in seconds) a device
can wait without receiving a configuration message before
attempting to reconfigure. All device ports (except for
designated ports) should receive configuration messages
at regular intervals. Any port that ages out STP information
(provided in the last configuration message) becomes the
designated port for the attached LAN. If it is a root port,
a new root port is selected from among the device ports
attached to the network. (References to “ports” in this
section mean “interfaces,” which includes both ports and
LAGs.) To enable Maximum Age click the Maximum Age
option and enter the required time (in seconds) in the
Maximum Age field.
Default: 20
Minimum: The higher of 6 or [2 x (Hello Time + 1)].
Maximum: The lower of 40 or [2 x (Forward Delay - 1)]
Forward Delay The maximum time (in seconds) this
device will wait before changing states (i.e., discarding
to learning to forwarding). This delay is required because
every device must receive information about topology
changes before it starts to forward frames. In addition,
each port needs time to listen for conflicting information
that would make it return to a discarding state; otherwise,
temporary data loops might result. To enable Forward
Delay, click the Forward Delay option and enter the
maximum time (in seconds) in the Forward Delay field.
Default: 15
Minimum: The higher of 4 or [(Max. Message Age / 2) + 1]
Maximum: 30
Modify the required attributes for STP. Click Save Settings
to save the changes.
Spanning Tree > STP Port Settings
Spanning Tree > STP Port Settings
