Spanning Tree Protocol Parameters - Enterasys VH-2402S Management Manual

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-2402S switch default settings for each parameter.
Parameter Description
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
fier 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.
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
other ports.
Cost Compo- The Spanning Tree Protocol calculates and ensures
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.
9033645-01
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
Port 9 -32776
Port 10 -32777
Port 11 -32778
Port 12 -32779
Port 13 -32780
Port 14 -32781
Port 15 -32782
Port 16 -32783
Port 17 -32784
Port 18 -32785
Port 19 -32786
Port 20 -32787
Port 21 -32788
Port 22 -32789
Port 23 -32790
Port 24 -32791
Spanning Tree Concepts 87
Default Value
32768 (bridge
priority)
128
19