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LANCOM GS-2124
Chapter 4: Operation of Web- based Management
132
When the LANCOM 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 LANCOM 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.
Forward Delay:
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 Lear-
ning 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.
Force Version:
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).
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