3Com 3500 manual Fddi path tvxLowerBound

230CHAPTER 8: FIBER DISTRIBUTED DATA INTERFACE (FDDI)

fddi path tvxLowerBound

✓3500

✓9000

9400

3900

9300

Specifies the minimum time value (in microseconds) of fddiMAC tvxValue that any MAC that is configured in this path uses.

Valid Minimum Abbreviation

fd pa tv

Important Considerations

■A MAC uses its valid transmission timer (TVX) to detect and recover from certain ring errors. If a valid frame has not passed through a MAC during the time indicated by fddiMACTvxValue, the MAC reinitializes the ring.

■By adjusting the tvxLowerBound value, you specify how quickly the ring recovers from an error. The lower you set this value, the faster the network reacts to problems, but the ring might be reinitialized when there is no problem.

■The higher you set this value, the less chance of frequent reinitializations, but the network takes longer to recover from errors.

■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
	tvxLowerBound	ports 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

tvxLowerBound Minimum time value of	0 – 4294967295 2500
fddiMAC tvxValue that any	microseconds
MAC that is configured onto
this path uses