Digital Networks North America DNswitch 800 manual STA Configuration When the Switch Becomes Root

When the Switch Becomes Root

Figure 3-16. STA Configuration - When the Switch Becomes Root

Parameter	Default	Description
Hello Time	2	The time interval (in seconds) at which the root
		device transmits a configuration message.
		The minimum value is 1.
		The maximum value is the lower of
		10 or [(Max. Message Age / 2) -1].
Max (Message) Age	20	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.
		The minimum value is the higher of
		6 or [2 x (Hello Time + 1)].
		The maximum value is the lower of
		40 or [2 x (Forward Delay - 1)].
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.

Maximum value is 30.

Minimum value is the higher of 4 or [(Max. Message Age / 2) + 1].

24 Configuring and Monitoring the Switch DNswitch 800