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3-10-2. STP Configuration
The STP, Spanning Tree Protocol, actually includes RSTP. In the Spanning Tree
Configuration, there are six parameters open for the user to configure as user's idea.
Each parameter description is listed below.
Function name:
STP Configuration
Function description:
User can set the following Spanning Tree parameters to control STP function
enable/disable, select mode RSTP/STP and affect STP state machine
behavior to send BPDU in this switch. The default setting of Spanning Tree
Protocol is "Disable".
Parameter description:
Spanning Tree Protocol:
Set 802.1W Rapid STP function Enable / Disable. Default is "Disable"
Bridge Priority:
The lower the bridge priority is the higher priority it has. Usually, the
bridge with the highest bridge priority is the root. If you want to have the
24 FAST ETHERNET + 2 GIGABIT L2 MANAGED SWITCH as root
bridge, you can set this value lower than that of bridge in the LAN. The
valid value is 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 other bridge to tell I am alive. When the 24
FAST ETHERNET + 2 GIGABIT L2 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 value
is 1 ~ 10 in unit of second.
Default is 2 seconds.
Max. Age:
When the 24 FAST ETHERNET + 2 GIGABIT L2 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 originated
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 malfunctioned and issue a Topology Change Notification (TCN)
BPDU to all other bridges. All bridges in the LAN will re-calculate and
determine who the root bridge is. The valid value of Max. Age is 6 ~ 40
seconds. Default is 20 seconds.
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