Planet Technology FGSW-2624SF manual 51

FGSW-2620VM / FGSW-2624SF User’s Manual

On the switch level, STP calculates the Bridge Identifier for each switch and then sets the

Root Bridge and the Designated Bridges.

On the port level, STP sets the Root Port and the Designated Ports.

The following are the user-configurable STP parameters for the switch level:

	Parameter		Description			Default Value
	Bridge Identifier(Not user		A combination of the User-set priority and the			32768 + MAC
	configurable		switch’s MAC address.
	except by setting priority below)		The Bridge Identifier consists of two parts:
			a 16-bit priority and a 48-bit Ethernet MAC address
			32768 + MAC
	Priority		A relative priority for each switch – lower numbers		32768
			give a higher priority and a greater chance of a
			given switch being elected as the root bridge
	Hello Time		The length of time between broadcasts of the hello			2 seconds
			message by the switch
	Maximum Age Timer		Measures the age of a received BPDU for a port			20 seconds
			and ensures that the BPDU is discarded when its
			age exceeds the value of the maximum age timer.
	Forward Delay Timer		The amount time spent by a port in the learning and			15 seconds
			listening states waiting for a
			BPDU that may return the port to the blocking state.
The following are the user-configurable STP parameters for the port or port group level:
	Variable		Description			Default Value
	Port Priority		A relative priority for each			32768
			port –lower numbers give a higher priority and a
			greater chance of a given port being elected as the
			root port
	Port Cost		A value used by STP to evaluate paths – STP			19-100Mbps Fast
			calculates path costs and selects the path with the			Ethernet ports
			minimum cost as the active path			4-1000Mbps Gigabit
						Ethernet ports
Default Spanning-Tree Configuration
		Feature		Default Value
		Enable state		STP enabled for all ports
		Port priority		128
		Port cost		19
		Bridge Priority		32,768

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