GE -DSH-73 User Manual page 96

Chapter 5: Web-Based Management
RSTP Parameters
RSTP Operation Levels
The Switch allows for two levels of operation: the switch level and the port level. The
switch level forms a spanning tree consisting of links between one or more switches.
The port level constructs a spanning tree consisting of groups of one or more ports.
The STP operates in much the same way for both levels.
NOTE: On the switch level, RSTP calculates the Bridge Identifier for each switch and
then sets the Root Bridge and the Designated Bridges.
On the port level, RSTP sets the Root Port and the Designated Ports.
The following are the user-configurable STP parameters for the switch level:
Parameter
Bridge Identifier (Not user
configurable except by
setting priority below)
Priority
Hello Time
Maximum Age Timer
Forward Delay Timer
92
Description
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
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
The length of time between broadcasts of
the hello message by the switch
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.
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.
Default Value
32768 + MAC
32768
2 seconds
20 seconds
15 seconds
GE-DSH-73/DSH-82 and DSH-82-PoE User Manual