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TRENDnet User’s Guide
Industrial Managed Switch Series
86
STP Status
Advanced Settings > STP > STP Status
Parameter Description
Current Root Status
MAC address This is the MAC address of the root bridge.
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.
MAX Age
This is the maximum time (in seconds) the Switch can wait
without receiving a configuration message before attempting
to reconfigure.
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.
Forward Delay
This is the time (in seconds) the root switch will wait before
changing states.
Current Bridge Status
MAC address This is the MAC address of the current bridge.
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.
Priority determines the root bridge, which in turn determines
the Root Hello Time, Root Maximum Age and Root Forwarding
Delay.
MAX 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 age 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.
Hello Time
This is the time interval in seconds between BPDU (Bridge
Protocol Data Units) configuration message generations by the
root switch.
Forward 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.
Path Cost
Path cost is the cost of transmitting a frame on to a LAN
through that port. It is recommended to assign this value
according to the speed of the bridge. The slower the media,
the higher the cost.
Root Cost
This is the number of the port on the Switch through which this
Switch must communicate with the root of the Spanning Tree.