Cabletron Systems 9E312, 9E423 Bridge Spanning Tree

Bridge Spanning Tree 3-11

9E312/9E423 Module Bridging

Non-Unicast

Displays the number of packets transmitted to, or received from, this interface

that had a source or destination address that is recognized by multiple devices on

the network segment. The Non-Unicast ﬁeld includes a count of broadcast

packets — those that are recognized by all devices on a segment, and multicast

packets such as Bridge BPDUs — those that are recognized by a group of devices

(but not necessarily all devices) on a segment. These statistics are displayed in the

pie chart (color-coded dark blue).

Discarded

Displays the number of packets which were discarded even though no errors

were detected to prevent transmission. One possible reason for discarding such a

packet could be to free up buffer space.

Discarding good packets indicates a very busy network. If a device routinely

discards packets, it usually means that network trafﬁc is overwhelming the

device, perhaps because the device is performing poorly.

These statistics are displayed in the pie chart (color-coded magenta).

Error

Displays the number of packets received or transmitted that contained errors.

These statistics are displayed in the pie chart (color-coded red).

Unknown Protocol

Displays the number of packets received which were discarded because of an

unknown or unsupported protocol. The 9E312/9E423 Module switch interface

will discard the packet and increment this counter if it can’t recognize the packet.

Packets Received

Displays the number of packets received by this interface.

Transmit Queue Size

The number of packets currently queued by the device for transmission from this

interface. The amount of device memory devoted to buffer space, and the trafﬁc

level on the target network, determine how large the output packet queue can

grow before the device begins to discard packets.

Packets Transmitted

Displays the number of packets transmitted by this interface.

Bridge Spanning Tree

The Bridge Spanning Tree window allows you to display and modify the

9E312/9E423’s bridge port information and protocol parameters relating to the

Spanning Tree Algorithm.

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