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

Chapter 26: RSTP Commands

Table 5 Bridge Priority Value Increments

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, not all links may have yet
	adapted to the change, resulting in network loops.
	The range is 4 to 30 seconds. The default is 15 seconds.
	This parameter effects only those ports operating in
	the STP compatible mode.
maxage	Specifies the length of time, in seconds, 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 value of 20, all bridges delete current configuration messages after 20 seconds. The range of this parameter 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)).

rstptype	Sets the RSTP mode. The parameters are
forceversion	equivalent. Values are:
	stpcompatible	The bridge uses the RSTP
		parameter settings, but
		transmits only STP BPDU

packets from the ports. This option is equivalent to the

FORCESTPCOMPATIBLE option.

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