Planet IGS-801T [71/120] User s manual of igs 801m
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Planet IGS-801T [71/120] User s manual of igs 801m

Planet IGS-801T [71/120] User s manual of igs 801m
User’s Manual of IGS-801M
On the switch level, STP calculates the Bridge Identifier for each switch and then sets the Root
Bridge and the Designated Bridges.
On the port level, STP sets the Root Port and the Designated Ports.
witch level: The following are the user-configurable STP parameters for the s
Parameter Description Default Value
Bridge Identifier
A combi
(Not user configurable except by
switch
setting priority below)
The Brid
nation of the User-set priority and the
’s MAC address.
ge 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 Hello Time cannot be longer than the Max. Age. Otherwise, a configuration error will
occur.
Observe the following formulas when setting the above parameters:
Max. Age _ 2 x (Forward Delay - 1 second)
Max. Age _ 2 x (Hello Time + 1 second)
71

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