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Parameter
Max. Age
Forward Delay
Force Version
4.15.3 STP P
C
ORT
ONFIGURATION
In the STP Port Setting, one item selection and five parameters settings are offered for user's setup. User can
disable and enable each port by selecting each Port Status item. User also can set Path Cost and Priority of
each port by filling in the desired value and set Admin Edge Port and Admin Point To Point by selecting the
desired item.
Table 4-37 (Continued). STP Configuration screen options.
When the LPB200A 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).
CHAPTER 4: Web-Based Management
Description
71
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