Enterasys Networks VH-8G manual Spanning Tree Protocol Parameters

Spanning Tree Protocol Parameters

Several configuration parameters control the operation of the Spanning Tree Protocol. Table A-1 describes the parameters and lists the VH-8G switch default settings for each parameter.

You can cause serious network performance degradation if you do not fully understand Spanning Tree concepts. Be sure to consult personnel experienced with this process prior to configuring Spanning Tree parameters.

Table A-1. Spanning Tree Protocol Defaults

Parameter	Description	Default Value
Bridge Group	Unique MAC group address, recognized by all bridg-
Address	es in the network.
Bridge Identi-	Identifier for each bridge. This parameter consists of	32768 (bridge
fier	two parts: a 16-bit bridge priority and a 48-bit network	priority)
	adapter address. Ports are numbered in absolute
	numbers starting from 1 regardless of their bridge at-
	tachment. The network adapter address is the same
	address as the first port of the bridge.
Port Identifier	Port Identifier Identifies each port of each bridge, with
	an incremental default value given for each port.
	Port 1 -32768
	Port 2 -32769
	Port 3 -32770
	Port 4 -32771
	Port 5 -32772
	Port 6 -32773
	Port 7 -32774
	Port 8 -32775
Port Priority	Indicates the priority of a specific port in relation to	128
	other ports.
Cost Compo-	The Spanning Tree Protocol calculates and ensures	4
nent of Each	that an active topology generates minimal cost paths.
Port	A value of 100 is generally used for 10Mbps Ethernet
	networks, a value of 19 for 100Mbps Fast Ethernet,
	and a value of 4 for 1000Mbps Gigabit Ethernet.

For detailed information on the operation of the Spanning Tree Protocol, consult Section 4 of IEEE Standard 802.1D, ISO/IEC 10038:1993.

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