Cisco 813 Specifications download pdf (Page 46)

CHAPTER 3

Spanning Tree

To enable Loop Guard on a specific interface, use the following:

(config-if)# spanning-tree guard loop

Loop Guard automatically reenables the port if it starts receiving BPDUs again.

Troubleshooting STP

Some common things to look for when troubleshooting Spanning Tree Protocol include:

n Duplex mismatch: When one side of a link is half-duplex and the other is full-duplex. This causes late collisions

and FCS errors.

n Unidirectional link failure: The link is up but data flows only in one direction. It can cause loops.

n Frame corruption: Physical errors on the line cause BPDUs to be lost, and the port incorrectly begins forwarding.

This is caused by duplex mismatch, bad cable, or cable too long.

n Resource errors: STP is implemented in software, so a switch with an overloaded CPU or memory might neglect

some STP duties.

n Port Fast configuration errors: Connecting a switch to two ports that have Port Fast enabled. This can cause a

loop.

n STP tuning errors: Max age or forward delay set too short can cause a loop. A network diameter that is set too low

causes BPDUs to be discarded and affects STP convergence.

[ 46 ]

© 2010 Pearson Education, Inc. All rights reserved. This publication is protected by copyright. Please see page 112 for more details.

CCNP SWITCH 642-813 Quick Reference by Denise Donohue

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Humminbird 585C User Manual (25 pages)

Brand: Humminbird | Category: Sports and recreation | Size: 0.58 MB |

English

Table of contents

FishFinder 585c

1

Operations Manual

1

Thank You!

2

Table of Contents

3

How Sonar Works

4

Single Beam Sonar

4

What’s On the Display

5

Understanding Sonar History

6

Real Time Sonar (RTS®) Window

6

Sonar View

6

Big Digits View

7

Sonar Zoom View

7

Key Functions

8

POWER/LIGHT Key

8

VIEW Key

8

Bottom Presentation

8

Powering Up the Unit

9

The Menu System

9

MENU Key

9

4-Way Cursor Control Key

9

EXIT Key

9

Start-Up Options Menu

10

Normal Operation

10

System Status

11

Simulator

11

Sonar X-Press™ Menu

12

Sensitivity

12

Bottom View

13

Upper Range

13

Lower Range

13

Chart Speed

13

Sonar Menu Tab

14

Zoom Level

14

Fish Sensitivity

15

Fish ID+™

15

Surface Clutter

16

Depth Lines

16

Water Type

17

Noise Filter

17

Max Depth

17

Fish ID Alarm

18

Alarms Menu Tab

18

Depth Alarm

18

Setup Menu Tab

19

Low Battery Alarm

19

Temp Alarm

19

Alarm Tone

19

(with Temp/Speed Only)

20

(International Only)

20

Select Views

21

Triplog Reset

21

Restore Defaults

21

Depth Offset

22

Temp Offset

22

Speed Calibration

22

Select Readouts

22

Display Problems

23

Troubleshooting

23

Finding the Cause of Noise

24

Specifications

24

Contact Humminbird®

25

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