SMC Networks TigerSwitch 100, Руководство по управлению

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S
PANNING
T
REE
P
ROTOCOL
C
ONFIGURATION
2-47
• Designated Root — Identifies the priority and MAC address of the
device in the Spanning Tree that the switch has accepted as the root
device.
- Root Port — Specifies the port number on the switch that is closest
to the root. The switch communicates with the root device through
this port. If there is no root port, the switch has been accepted as the
root device of the Spanning Tree network.
- Root Path Cost — Identifies the path cost from the root port on
the switch to the root device.
• Root Hello Time * – Interval (in seconds) at which this device
transmits a configuration message.
• Root Maximum Age * – The maximum time (in seconds) this 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. If the root port ages
out STA information (provided in the last configuration message), a
new root port is selected from among the device ports attached to the
network. (References to “ports” in this section means “interfaces,”
which includes both ports and trunks.)
• Root Forward Delay * – The maximum time (in seconds) this 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.
• Configuration Changes — Specifies the number of times the
Spanning Tree has been reconfigured.
• Last Topology Change — Identifies the time since the Spanning
Tree was last reconfigured.