Tripp Lite NGI-M05-C1, Руководство пользователя, Страница: 164 / 254

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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.