Signamax 065-7840 24-Port 10/100/1000BaseT/TX Managed Switch
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3-13-2. STP Configuration
The STP, Spanning Tree Protocol, also includes Rapid Spanning Tree
Protocol (RSTP). In the Spanning Tree Configuration, there are six
parameters
available for the user to configure as desired. Each parameter’s description is listed
below.
Function name:
STP Configuration
Function description:
The user can set the following Spanning Tree parameters to control the STP
function, enable/disable, select mode RSTP/STP, and affect STP state
machine behavior to send BPDU (Bridge Protocol Data Unit
1
) messages in
this switch. The default setting of Spanning Tree Protocol is “Disable”.
Parameter description:
Spanning Tree Protocol:
Sets the 802.1W Rapid STP function to “Enable” or “Disable”. Default is
“Disable”
Bridge Priority:
The lower the bridge priority number is, the higher priority it has. Usually,
the bridge with the highest bridge priority is the root. If you want to have
the 065-7840 managed switch as the root bridge, you can set this value
lower than that of bridge in the LAN. The valid values are 0 ~ 61440. The
default is 32768.
Hello Time:
Hello Time is used to determine the periodic time to send normal BPDU
from designated ports among bridges. It decides how long a bridge
should send this message to another bridge to tell it that it is alive. When
the 065-7840 managed switch is the root bridge of the LAN, for example,
all other bridges will use the hello time assigned by this switch to
communicate with each other. The valid values are 1 ~ 10, in units of
seconds. Default is 2 seconds.
Max. Age:
When the 065-7840 managed switch is the root bridge, the whole LAN
will apply this figure set by this switch as their maximum age time. When
a bridge received a BPDU originating from the root bridge and if the
message age conveyed in the BPDU exceeds the Max. Age of the root
bridge, the bridge will treat the root bridge as malfunctioned, and issue a
Topology Change Notification (TCN) BPDU to all other bridges. All
bridges in the LAN will recalculate and determine who the root bridge is.
The valid values of Max. Age are 6 ~ 40 seconds. Default is 20 seconds.
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BPDUs are data messages that are exchanged across the switches within an extended
LAN that uses a spanning tree protocol topology. BPDU packets contain information on ports,
addresses, priorities and costs, and ensure that the data ends up where it was intended to
go. BPDU messages are exchanged across bridges to detect loops in a network topology.
The loops are then removed by shutting down selected bridge interfaces and placing
redundant switch ports in a backup, or blocked, state.
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