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Parameter description:
Spanning Tree Protocol:
Bridge Priority:
Hello Time:
Max. Age:
Forward Delay:
Force Version:
114
Set 802.1W Rapid STP function Enable / Disable. Default is
"Disable"
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 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 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 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.
When the 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.
You can set the root bridge forward delay time. This figure
is set by root bridge only. The forward delay time is defined
as the time spent from Listening state moved to Learning
state and also from Learning state moved to Forwarding
state of a port in bridge. The forward delay time contains
two states, Listening state to Learning state and Learning
state to Forwarding state. It assumes that forward delay time
is 15 seconds, then total forward delay time will be 30
seconds. This has much to do with the STP convergent time
which will be more than 30 seconds because some other
factors.
The valid value is 4 ~ 30 seconds, default is 15 seconds.
Two options are offered for the user's choosing STP
algorithm. One is RSTP and the other is STP. If STP is
chosen, RSTP will run as a legacy STP. The switch supports
RSTP (802.1w) which is backward compatible with STP
(802.1d).
VigorSwitch G2240 User's Guide
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