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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
158
• Max Age
The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure.
All device ports (except for designated ports) should receive configuration
messages at regular intervals. Any port that ages out STA information (provided
in the last configuration message) becomes the designated port for the attached
LAN. If it is a root port, a new root port is selected from among the device ports
attached to the network. (References to “ports” in this section mean “interfaces,”
which includes both ports and trunks.)
• Hello Time
The time interval (in seconds) at which the root device transmits a configuration
message.
• Forward Delay
The maximum time (in seconds) the root device will wait before changing states
(i.e., discarding to learning to forwarding).
This delay is required because every device 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 discarding
state; otherwise, temporary data loops might result.
The priority and MAC address of the device in the Spanning Tree that this
Managed Switch has accepted as the root device.
- Root Port
The number of the port on this Managed Switch that is closest
to the root. This Managed Switch communicates with the root
device through this port. If there is no root port, then this
Managed Switch has been accepted as the root device of the
Spanning Tree network.
• Designated Root
- Root Path
Cost
The path cost from the root port on this switch to the root
device.
• Configuration
Changes
The number of times the Spanning Tree has been reconfigured.
• Last Topology Change
Time since the Spanning Tree was last reconfigured.
The current root port and current root cost display as zero when this device is not connected
to the network.