Planet Technology FGSW-2620PVM, FGSW-2620VM 4.5.2 STP Parameters

User’s Manual of FGSW-2620VM / FGSW-2620PVM

4.5.2 STP Parameters

STP Operation Levels

The Switch allows for two levels of operation: the switch level and the port level. The switch level forms a spanning tree consisting of links between one or more switches. The port level constructs a spanning tree consisting of groups of one or more ports. The STP operates in much the same way for both levels.

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	32768 + MAC
configurable	the switch’s MAC address.
except by setting priority	The Bridge Identifier consists of two parts:
below)	a 16-bit priority and a 48-bit Ethernet MAC
	address 32768 + MAC.
Priority	A relative priority for each switch – lower	32768
	numbers 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	2 seconds
	the hello message by the switch.
Maximum Age Timer	Measures the age of a received BPDU for a	20 seconds
	port 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	15 seconds
	learning and 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	128
	port –lower numbers give a higher priority
	and a greater chance of a given port being
	elected as the root port.

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