Allied Telesis management software layer 2+ fast ethernet switches manual Seconds

					AT-S62 Command Line User’s Guide
		Table 1 Bridge Priority Value Increments (continued)
	Increment		Bridge	Increment		Bridge
			Priority			Priority
	7		28672	15		61440
hellotime		Specifies the time interval between generating and
		sending configuration messages by the bridge. This
		parameter can be from 1 to 10 seconds. The default is
		2 seconds.
forwarddelay		Specifies the waiting period before a bridge changes
		to a new state, for example, becomes the new root
		bridge after the topology changes. If the bridge
		transitions too soon, all links may not have had time to
		adapt to the change, resulting in network loops. The
		range is 4 to 30 seconds. The default is 15 seconds.
maxage		Specifies the length of time after which stored bridge
		protocol data units (BPDUs) are deleted by the bridge.

All bridges in a bridged LAN use this aging time to test the age of stored configuration messages called bridge protocol data units (BPDUs). For example, if you use the default 20, all bridges delete current configuration messages after 20 seconds. The range is 6 to 40 seconds. The default is 20 seconds.

Note

The value for the maxage parameter must be greater than (2 x (hellotime +1)) and less than (2 x (forwarddelay -1)).

Description

This command sets the following STP parameters

❑Bridge priority

❑Hello time

❑Forwarding delay

❑Maximum age time

This command can also disable STP and return the STP parameters to their default settings.

Note

You can use this command only if STP is designated as the active spanning tree protocol. See ACTIVATE STP on page 380.

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