3Com 3500 manual By the root bridge. Compare with the bridgeMaxAge, Field, PeakAddrCount, Priority

254CHAPTER 9: BRIDGE-WIDE PARAMETERS

Field	Description
maxAge	Time period in seconds that the bridge uses to discard
	stored configuration messages. The value is determined
	by the root bridge. Compare with the bridgeMaxAge
	field.
mode	Reflects that the bridge operates as a transparent bridge.
peakAddrCount	Reflects the highest number of addresses that have been
	counted since the last address table flush. For the current
	size of the address table, see the addressCount field.
priority	Configurable STP priority value for the bridge. The default
	value is 0x8000. (0x signifies that 8000 is a hexadecimal
	number.) The acceptable range is 0x0 – 0xffff (0 – ffff). To
	configure a value, see “bridge spanningTree stpPriority”
	later in this chapter. The bridge priority is included in the
	bridge identifier and is considered the most significant
	portion because it influences root bridge selection. A
	lower priority increases the odds that the bridge will
	become the root bridge.
rootCost	Value that reflects the total cost of the best path (lowest
	value) from the bridge root port to the root bridge. The
	value sums individual port path costs. To configure path
	costs for ports on the bridge, see “bridge port stpCost” in
	Chapter 10.
rootPort	Logical port with the best path from the bridge to the root
	bridge.
stpGroupAddress	Address to which the bridge listens to receive
	configuration messages and other STP information. To
	modify the STP group address, see “bridge spanningTree
	stpGroupAddress” later in this chapter.
stpState	Whether the Spanning Tree Protocol is enabled or
	disabled for the bridge. The default value is disabled for all
	switches except CoreBuilder 9000 modules. To configure
	the bridge STP state, see “bridge spanningTree stpState”
	later in this chapter. (STP is also configured on a
	port-by-port basis. See “bridge port stpState” in
	Chapter 10.)
timeSinceLastTopology	Time elapsed (in hours, minutes, and seconds) since STP
Change	last reconfigured the network topology.
topologyChangeCount	Number of times that STP has reconfigured the network
	topology since you enabled STP or rebooted the system
	(whichever is less).
topologyChangeFlag	Whether the bridge topology is currently changing
	(true) or not changing (false)