Cabletron Systems 9E312, 9E423 3-16 Bridge Spanning Tree

9E312/9E423 Module Bridging

3-16 Bridge Spanning Tree

A lower assigned value gives the port a higher Priority when BPDUs are

compared. The allowable range is 0-FF hexadecimal (0-255 decimal); the default is

80 hexadecimal.

Path Cost

Displays the cost that this port will contribute to the calculation of the overall

Root path cost in a Conﬁguration BPDU transmitted by this bridge port. You can

lower a port’s Path Cost to make the port more competitive in the selection of the

Designated Port — for example, you may want to assign a lower path cost to a

port on a higher performance bridge. The allowable range is 1 to 65535.

Designated Cost

Displays the cost of the path to the Root Bridge of the Designated Port on the

LAN to which this port is attached. This cost is added to the Path Cost to test the

value of the Root Path Cost parameter received in Conﬁguration BPDUs.

Designated Root

Displays the unique bridge identiﬁer of the bridge that is assumed to be the Root

Bridge.

Designated Bridge

Displays the network address portion of the Bridge ID (MAC address/priority

component) for the bridge that is believed to be the Designated Bridge for the

LAN associated with this port.

The Designated Bridge ID, along with the Designated Port and Port Identiﬁer

parameters for the port, is used to determine whether this port should be the

Designated Port for the LAN to which it is attached. The Designated Bridge ID is

also used to test the value of the Bridge Identiﬁer parameter in received BPDUs.

Designated Port

Displays the network address portion of the Port ID (which includes a

manageable priority component) of the port believed to be the Designated Port

for the LAN associated with this port.

The Designated Port ID, along with the Designated Bridge and Port Identiﬁer

parameters for the port, is used to determine whether this port should be the

Designated Port for the LAN to which it is attached. Management also uses it to

determine the Bridged LAN topology.

Topology

This indicates how many times the bridge’s Topology Change ﬂag has been

changed since the 9E312/9E423 Module was last powered-up or initialized. It also

indicates the date and time at which the topology was last changed. The Topology

Change ﬂag increments each time a bridge enters or leaves the network, or when

the Root Bridge ID changes.

Contents

Main i Notice Virus Disclaimer ii iii Restricted Rights Notice Page v Contents Chapter 2 The 9E312/9E423 Module View Chapter 1 Introduction Chapter 3 9E312/9E423 Module Bridging Index 1-1 Introduction versions 1-2 Using the 9E312 and 9E423 Users Guide Using the 9E312 and 9E423 Users Guide Related Manuals 1-3 Related Manuals Software Conventions Common 9E312 and 9E423 Window Fields Software Conventions 1-5 Using Buttons and Menus 1-6 Getting Help Getting Help Using On-line Help Getting Help from Cabletron Systems Technical Support 9E312 and 9E423 Firmware 1-7 9E312 and 9E423 Firmware Page Chapter 2 The 9E312/9E423 Module View 2-2 Viewing Module Information Viewing Module Information Viewing Module Information 2-3 Front Panel Information 2-4 Viewing Module Information Menu Structure Viewing Module Information 2-5 2-6 Viewing Module Information Viewing Module Information 2-7 The 9E312/9E423 Module Port Status Display The Chassis Manager Window Managing the Module 2-9 Viewing the Device Type Managing the Module Setting the Device Date and Time 2-10 Managing the Module Using the Find Source Address Feature 2-11 Enabling and Disabling Bridge Ports Using the Find Source Address Feature ! 2-12 I/F Summary Information I/F Summary Information I/F Summary Information 2-13 Interface Description Fields 2-14 I/F Summary Information Interface Performance Statistics/Bar Graphs I/F Summary Information 2-15 Interface Detail Window The 9E312/9E423 Module View 2-16 I/F Summary Information I/F Summary Information 2-17 2-18 I/F Summary Information Testing and Disabling the Current Interface I/F Summary Information 2-19 Using the Applications Pull-down menu Page Chapter 3 9E312/9E423 Module Bridging Bridging Basics 3-2 An Overview of Remote Bridge Management More on Transparent Bridging An Overview of Remote Bridge Management The Bridge Status Window 3-3 The Bridge Status Window 3-4 The Bridge Status Window Bridge Status Window Information Fields The Bridge Status Window 3-5 Accessing Other Management Options from the Bridge Status Window 3-6 Enabling and Disabling Bridging Enabling and Disabling Bridging Bridge Statistics Bridge Statistics 3-7 9E312/9E423 Module Bridging Performance Graphs 3-8 Bridge Statistics Bridge Statistics 3-9 The Interface Statistics Window 3-10 Bridge Statistics Bridge Spanning Tree 3-11 Bridge Spanning Tree 3-12 Bridge Spanning Tree Bridge Spanning Tree 3-13 Conguring the Bridge Spanning Tree Window Bridge Level Fields 3-14 Bridge Spanning Tree Bridge Spanning Tree 3-15 Bridge Port Level Fields 3-16 Bridge Spanning Tree Bridge Spanning Tree 3-17 Changing Bridge Spanning Tree Parameters ! 3-18 Bridge Spanning Tree Filtering Database 3-19 Filtering Database 3-20 Filtering Database Filtering Database 3-21 3-22 Filtering Database Filtering Database Window Fields Filtering Database 3-23 Conguring the Filtering Database 3-24 Filtering Database Filtering Database 3-25 3-26 Filtering Database Using Port Source Addressing Filtering Database 3-27 3-28 Duplex Modes Duplex Modes The Duplex Modes Window Duplex Modes 3-29 3-30 Duplex Modes Index-1 Index A B C D L M N P R