Spanning Tree Protocol Parameters - Cabletron Systems SmartSTACK ELS100-24TXM Installation And User Manual

Spanning Tree Protocol Parameters

Several configuration parameters control the operation of the Spanning
Tree Protocol. Table B-1 describes the parameters and lists the
ELS100-24TXM 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 pro-
cess prior to configuring Spanning Tree parameters.
Table B-1. Spanning Tree Protocol Defaults
Parameter Description
Bridge Unique MAC group address, recognized by all bridges
Group in the network.
Address
Bridge Iden- Identifier for each bridge. This parameter consists of
tifier 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
attachment. The network adapter address is the same
address as the first port of the bridge.
Port Identi- Identifies each port of each bridge, with an incremen-
fier tal 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 and a value of 10 is generally used for
100Mbps Ethernet networks.
For detailed information on the operation of the Spanning Tree Protocol,
consult Section 4 of IEEE Standard 802.1D, ISO/IEC 10038:1993.
9032785
Port 9 -32776 Port 17 -32784
Port 10 -32777 Port 18 -32785
Port 11 -32778 Port 19 -32786
Port 12 -32779 Port 20 -32787
Port 13 -32780 Port 21 -32788
Port 14 -32781 Port 22 -32789
Port 15 -32782 Port 23 -32790
Port 16 -32783 Port 24 -32791
Default Value
32768 (bridge
priority)
128
10
Spanning Tree Concepts 83