Enterasys Networks VH-8G Manuel D’Utilisation
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Spanning Tree Concepts 85
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
Tree Protocol. Table A-1 describes the parameters and lists the VH-8G
switch default settings for each parameter.
Table A-1. Spanning Tree Protocol Defaults
For detailed information on the operation of the Spanning Tree Protocol,
consult Section 4 of IEEE Standard 802.1D, ISO/IEC 10038:1993.
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.
if you do not fully understand Spanning Tree concepts. Be
sure to consult personnel experienced with this process
prior to configuring Spanning Tree parameters.
Parameter
Description
Default Value
Bridge Group
Address
Address
Unique MAC group address, recognized by all bridg-
es in the network.
es in the network.
Bridge Identi-
fier
fier
Identifier for each bridge. This parameter consists of
two parts: a 16-bit bridge priority and a 48-bit network
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.
two parts: a 16-bit bridge priority and a 48-bit network
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.
32768 (bridge
priority)
priority)
Port Identifier
Port Identifier Identifies each port of each bridge, with
an incremental default value given for each port.
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
other ports.
other ports.
128
Cost Compo-
nent of Each
Port
nent of Each
Port
The Spanning Tree Protocol calculates and ensures
that an active topology generates minimal cost paths.
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.
that an active topology generates minimal cost paths.
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.
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