3Com 3500 manual Fddi path maxTreq, Microseconds Ring’s operational token Rotation time, TOpr

232CHAPTER 8: FIBER DISTRIBUTED DATA INTERFACE (FDDI)

fddi path maxTreq

✓3500

✓9000

9400

3900

9300

Specifies the maximum time value (in microseconds) of fddiMACT-Req that is used by any MAC that is configured in this path. T-Req is the value that a MAC bids during the claim process to determine a ring’s operational token rotation time, T_Opr. The lowest T-Req bid on the ring becomes T_Opr.

Valid Minimum Abbreviation

fd pa m

Important Considerations

■When you set T_Opr low, the token rotates more quickly, so token latency is reduced. However, more of the ring’s available bandwidth is used to circulate the token.

■Higher values of T_Opr use less bandwidth to circulate the token, but they increase token latency when the ring is saturated.

■You can use this command to configure the same setting on multiple ports simultaneously. When you specify multiple port numbers, the system prompts you to choose the setting and then applies it to all of the ports.

Options

Prompt	Description	Possible Values	[Default]
Ports	One or more FDDI station ports	■ Any of the	–
	for which you want to set the	available ports
	path maxTreq	on the installed
		FDDI modules

Path	Path that you want to set.
	■	A DAS port has primary and
		secondary paths.
	■	A SAS port has only a
		primary path.

■all

■ p (primary) –

■s (secondary)

■all

maxTreq	Value that a MAC bids during	0 – 4294967295	16500
	the claim process to determine	microseconds
	a ring’s operational token
	rotation time, T_Opr