Accton Technology CheetahSwitch Workgroup, 4508 manual STA Port Configuration, Path Cost 100/19/4

CheetahSwitch Workgroup-4508

Parameter	Default	Description
Forward Delay	15	The maximum time (in seconds) the root device will wait before
		changing states (i.e., listening 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 blocking state; otherwise,
		temporary data loops might result.
		The maximum value is 30. The minimum value is the higher of 4
		or [(Max. Message Age / 2) + 1].

STA Port Configuration

The following figure and table describe STA configuration for ports.

Parameter	Default	Description
Priority	128	Defines the priority for the use of a port in the STA algorithm. If the
		path cost for all ports on a switch are the same, the port with the
		highest priority (i.e., lowest value) will be configured as an active
		link in the spanning tree. Where more than one port is assigned the
		highest priority, the port with lowest numeric identifier will be
		enabled.
		The range is 0 - 255.
(Path) Cost	100/19/4	This parameter is used by the STA algorithm to determine the best
		path between devices. Therefore, lower values should be assigned

to ports attached to faster media, and higher values assigned to ports with slower media.

The default and recommended range is: Standard Ethernet: 100 (50~600)

Fast Ethernet: 19 (10~60)

Gigabit Ethernet: 4 (3~10) The full range is 0 - 65535.

Note: Path cost takes precedence over port priority.

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