Panasonic GA-ML Series, Manual

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5 L2 Features
5.3 STP (Spanning Tree Protocol) 5.3.1 STP Global Settings
Click Apply to reflect the change.
In the section of an STP Configuration , you can configure the following
parameters.
Parameter Overview
Priority Choose the value of an STP priority. You can specify the
value within the range from 0 to 61,440. By default, the
value is 32,768. The lower the value, the higher priority
will be.
Parameter Overview
Bridge Max Age Enter the value of bridge-maximum age. The range is
from 6 to 40 (seconds). By default, the value is 20
(seconds). Set the value of the maximum age to ensure
that old information does not circulate limitlessly
through redundant paths in the network; the effective
propagation of new information is not prevented. As
the value is set to a root bridge, it is useful to evaluate
that the settings of a spanning tree of the switch is the
same with other devices of a bridge VLAN.
Bridge Hello Time This parameter becomes available if you choose RSTP
or STP on the STP Mode . Enter the value of hello time
for a bridge. The range is from 1 to 2 (seconds). By
default, the value is 2 (seconds). This is the interval for
transmitting BPDU (Bridge Protocol Data Unit) packets
whose root bridge is twice, to inform that it is a root
bridge on all of other switches. This field is displayed
when you choose an STP or RSTP (Rapid Spanning Tree
Protocol) as the STP version. In the case of an MSTP, the
hello-time needs to be configured as a port-unit.
Bridge Forward Time Enter the value of bridge-forward time. The range is
from 4 to 30 (seconds). By default, the value is 15
(seconds). This means the time for listening condition
when all the ports of a switch migrate (or move) from
the blocking state to a forwarding state.
TX Hold Count Enter the value of a transmission hold count. The range
is from 1 to 10 (times). By default, the value is 6 (times).
Use the value to configure the maximum number of
hello packets, which are transmitted with the
predetermined interval.