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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.