Graco GE-DS-242-POE User configurable, Except by setting Priority below, Hello Time, Port Cost

Chapter 4: Web-Based Management

NOTE: 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:

PARAMETER	DESCRIPTION	DEFAULT VALUE
Bridge Identifier (Not	A combination of the User-set priority and the
	switch's MAC address.
user configurable	The Bridge Identifier consists of two parts:	32768 + MAC
except by setting
priority below)	a 16-bit priority and a 48-bit Ethernet MAC address
	32768 + MAC.
	A relative priority for each switch - lower numbers
Priority	give a higher priority and a greater chance of a given	32768
	switch being elected as the root bridge.
Hello Time	The length of time between broadcasts of the hello	2 seconds
	message by the switch.
	Measures the age of a received BPDU for a port and
Maximum Age Timer	ensures that the BPDU is discarded when its age	20 seconds
	exceeds the value of the maximum age timer.
	The amount time spent by a port in the learning and
Forward Delay Timer	listening states waiting for a BPDU that may return	15 seconds
	the port to the blocking state.

The following are the user-configurable STP parameters for the port or port group level:

PARAMETER	DESCRIPTION	DEFAULT VALUE
	A relative priority for each switch - lower numbers
Port Priority	give a higher priority and a greater chance of a given	128
	switch being elected as the root bridge.
		200,000-100Mbps
	A value used by STP to evaluate paths - STP	Fast Ethernet ports
Port Cost	calculates path costs and selects the path with the	20,000-1000Mbps
	minimum cost as the active path.	Gigabit Ethernet ports
		0 - Auto

GE-DS-242-PoE Managed Ethernet Switch User Manual 73