User Manual

User’s Manual of LRP-822CS/LRP-1622CS
144
for the switch level: The following are the user-configurable STP parameters
Parameter Description Default Value
Bridge Identifier (Not user
configurable
except by setting priority
below)
A combination of the User-set priority and the switch’s
MAC address.
The Bridge Identifier consists of two parts:
a 16-bit priority and a 48-bit Ethernet MAC address
32768 + MAC
32768 + MAC
Priority
A relative priority for each switch – lower numbers give a
higher priority and a greater chance of a given switch
being elected as the root bridge
32768
Hello Time
The length of time between broadcasts of the hello
message by the switch
2 seconds
Maximum Age Timer
Measures the age of a received BPDU for a port and
ensures that the BPDU is discarded when its age
exceeds the value of the maximum age timer.
20 seconds
Forward Delay Timer
The amount time spent by a port in the learning and
listening states waiting for a
BPDU that may return the port to the blocking state.
15 seconds
The following are the user-configurable STP parameters for the port or port group level:
Variable Description Default Value
Port Priority
A relative priority for each
port –lower numbers give a higher priority and a
greater chance of a given port being elected as
the root port
128
Port Cost
A value used by STP to evaluate paths – STP
calculates path costs and selects the path with
the minimum cost as the active path
200,000-100Mbps Fast Ethernet ports
20,000-1000Mbps Gigabit Ethernet ports
0 - Auto
Default Spanning-Tree Configuration
Feature Default Value
Enable state STP disabled for all ports
Port priority 128
Port cost 0
Bridge priority 32,768
User-Changeable STA Parameters
he Switch’s factory default setting should cover the majority of installations. However, it is advisable to keep the default
ettings as set at the factory; unless, it is absolutely necessary. The user changeable parameters in the Switch are as follows:
T
s