Connection State, LER Estimate | Cabletron Systems 9A128-01 guide

The 9A128-01 Module View

FDDI port status view options are:

Connection State

The Connection State port display form indicates the port’s connection status:

•CON (connecting): the port is trying to establish a link, but has not yet been successful. Ports which are not connected and which have not been disabled by management will display this status.

•ACT (active): the port has been enabled by management and has successfully established a link.

•SBY (standby): the port has a physical link, but the SMT Connection Policy is prohibiting a logical connection to the ring because the attempted connection is illegal. FDDI protocol always forbids connecting two master ports; all other connections are theoretically legal, although some are not desirable. You can view the SMT Connection Policy by selecting the SMT Connection Policy option from the FDDI menu; for more information, see Chapter 4, FDDI Management.

•DIS (disabled): the port has been disabled by management; note that this status does not indicate whether or not there is a physical link connected to the port.

LER Estimate

The Link Error Rate (LER) Estimate port display form displays a cumulative long term average of the bit error rate, which represents the quality of the physical link. It is computed when the port is connected and every 10 seconds thereafter. The value of the LER Estimate can range from 10-4to 10-15, but it is always displayed as the absolute value of the exponent; for example, if the port’s LER Estimate is computed to be 10-5, the value displayed in the Port Status box will be 5.0, which represents an actual rate of 1,250 bit errors per second. The lower LER Estimate numbers represent the highest bit error rates, as summarized in the ﬁgure below.

.000000125

.00000125

.0000125

.000125

.00125

Bit Errors

.0125

per Second

.125

1.25

12.5

125

1250

12500

4 5 6 7 8 9 10 11 12 13 14 15

Reported LER Estimate

Figure 2-4. LER Estimate Values

Viewing Module Information

2-11

Image 24

Cabletron Systems 9A128-01 manual Connection State, LER Estimate

Contents

Cabletron Systems Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Fddi Management Chapter BridgingIndex Using This Guide Introduction Related Reading Software Conventions Common Window FieldsDevice Name IP Address Using Buttons Using On-line HelpGetting Help Location Getting Help from the Cabletron Systems Global Call Center FTP Firmware Versions Supported 9A128-01 Module View Viewing Module Information Front Panel Information Boot Prom Connection StatusUpTime Port Status Menu Structure TimeDate A128-01 Module View Menu Structure Device Menu Port Status Menu Fddi Menu Utilities MenuHelp Menu Board Menus Port Status Displays Port Menus Selecting a Port Status View Bridge Port Status Displays Bridge Port State Bridge MappingBridge Port Status Color Codes Fddi Port Status Displays Connection State LER Estimate Chassis Manager Window Fddi Port Status Color Codes Viewing Hardware Types Device TypeModule Type Viewing I/F Summary Information Module Type Window Index DescriptionSta Interface Performance Statistics/Bar Graphs Raw Counts Load Rate Interface Statistics Window Error AddressUnicast Non-Unicast Using the Find Source Address Feature Packets Received Received onlyTransmit Queue Size Transmit only Packets Transmitted Transmit only Setting the Device Date and Time Managing the Hub Enabling and Disabling Ports Bridge Ports Module Ports Accessing the ATM Connections Window ATM Conﬁguration ATM Conﬁguration Connection Data Settings VPI Conﬁguring Connections Adding a New Connection Deleting a Connection ATM Conﬁguration Conﬁguring Connections Fddi Management Conﬁguration Fddi Management MAC State SMT Version Req. Requested Target Token Rotation TimeNeg. Negotiated Concentrator M Ports Concentrator Non-M PortsNumber of MACs MAC Path Connection Policy 15 32,768 a permanently set value for this bit Address Mode Station ListNumber of Nodes Stations Panel Node ClassTopology Upstream Neighbor Performance Frame Errors Transmit FramesReceive Frames Lost Frames Fddi Management Performance Bridging Bridge Status Window Bridging Up Time Bridge State on InterfaceInterface Type Bridge Address Conﬁguring Duplex Modes Enabling and Disabling Bridging Bridge Statistics Performance Graphs Forwarded Green Total Errors Red Filtered MagentaXmitted Blue Conﬁguring the Bridge Performance Graphs Errors ForwardedFiltered Xmitted Interface Statistics Window Forwarded toForwarded from Description Using Source Addressing Setting the Ageing Time Port Source Addresses Window Bridge Spanning Tree Conﬁguring the Bridge Spanning Tree Window Bridge Priority Root Bridge Root CostRoot Port Protocol Forwarding Delay Hello TimeMax Age Hold Time Changing Bridge Spanning Tree Parameters Changing Bridge Priority Changing the Spanning Tree Algorithm Protocol TypeChanging Hello Time Changing Forwarding Delay Time Changing Max Age TimeChanging Port Priority Filtering Database Changing Path Cost Bridging Bridging List NumberCapacity Ageing Time Conﬁguring the Filtering Database Receive PortPort Filtering Altering the Ageing Time Changing the Type of EntryChanging the Receive Port Changing the Port Filtering Action Clearing All Permanent, Static, or Dynamic Entries Bridging Filtering Database Index Index-2 Index-3 Index Index-4