Chapter 9 Spanning Tree Protocol
GS1500-24P User’s Guide
76
Priority Priority is used in determining the root switch, root port and designated
port. The switch with the highest priority (lowest numeric value)
becomes the STP root switch. If all switches have the same priority, the
switch with the lowest MAC address will then become the root switch.
Select a value from 0~61440 from the drop-down list box.
The lower the numeric value you assign, the higher the priority for this
bridge.
Priority determines the root bridge, which in turn determines the Root
Hello Time, Root Maximum Age and Root Forwarding Delay.
Maximum Age This is the maximum time (in seconds) the Switch can wait without
receiving a BPDU before attempting to reconfigure. All Switch ports
(except for designated ports) should receive BPDUs at regular intervals.
Any port that ages out STP information (provided in the last BPDU)
becomes the designated port for the attached LAN. If it is a root port, a
new root port is selected from among the Switch ports attached to the
network. The allowed range is 6 to 40 seconds.
Hello Time This is the time interval in seconds between BPDU (Bridge Protocol Data
Units) configuration message generations by the root switch. The
allowed range is 1 to 10 seconds.
Forwarding
Delay
This is the maximum time (in seconds) the Switch will wait before
changing states. This delay is required because every switch must
receive information about topology changes before it starts to forward
frames. In addition, each port needs time to listen for conflicting
information that would make it return to a blocking state; otherwise,
temporary data loops might result. The allowed range is 4 to 30
seconds.
As a general rule:
Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Root priority Root refers to the base of the spanning tree (the root bridge). This
field displays the root bridge’s priority. This Switch may also be the root
bridge.
Root MAC
Address
This is the MAC address of the root bridge.
Root Path Cost This is the path cost from the root port on this Switch to the root switch.
Root Port This is the number of the port on the Switch through which this Switch
must communicate with the root of the Spanning Tree.
Root Maximum
Age
This is the maximum time (in seconds) the Switch can wait without
receiving a configuration message before attempting to reconfigure.
Root Hello Time This is the time interval (in seconds) at which the root switch transmits
a configuration message. The root bridge determines Hello Time, Max
Age and Forwarding Delay.
Root Forward
Delay
This is the time (in seconds) the root switch will wait before changing
states.
Topology
Changes
This is the number of times the spanning tree has been reconfigured.
Table 17 Configuration > Spanning Tree > STP Global Setting (continued)
LABEL DESCRIPTION
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