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CHAPTER 3

Spanning Tree

Spanning Tree Port States

When a port is first activated, it transitions through the following stages shown in Table 3-2.

Table 3-2 Spanning Tree Port States

Port State Timer Action

Blocking Max Age (20 sec) Discards frames, does not learn MAC addresses, receives BPDUs

Listening Forward Delay (15 sec) Discards frames, does not learn MAC addresses, receives BPDUs to determine its

role in the network

Learning Forward Delay (15 sec) Discards frames, does learn MAC addresses, receives and transmits BPDUs

Forwarding Accepts frames, learns MAC addresses, receives and transmits BPDUs

Per-VLAN Spanning-Tree

The IEEE’s version of STP assumes one common Spanning-tree instance (and thus one root bridge) regardless of how

many VLANs are configured. With the Cisco Per-VLAN Spanning-Tree (PVST+) there is a different instance of STP for

each VLAN. To derive the VLAN BID, the switch picks a different MAC address from its base pool for each VLAN.

Each VLAN has its own root bridge, root port, and so on. You can configure these so that data flow is optimized, and

traffic load is balanced among the switches by configuring different root bridges for groups of VLANs.

PVST+ is enabled by default on Cisco switches.

[ 36 ]

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CCNP SWITCH 642-813 Quick Reference by Denise Donohue

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Indice

Super Audio CD

1

Welcome!

2

About This Manual

2

TABLE OF CONTENTS

3

Before You Start the

4

DIGITAL OUT

5

ANALOG OUT

5

Location and

6

Functions of

6

Rear Panel Parts Descriptions

8

Remote Parts Descriptions

9

Playing Discs

10

Playing a Disc

11

10 45.28

12

TRACK MIN SEC

12

HITECHBLUES

13

1 1 1.56

13

Locating a Specific Track

14

Playing Tracks Repeatedly

16

(Programme Play) Z

17

(Shuffle Play) Z

17

(Digital Filter Function) Z

18

Additional

20

Information

20

Notes on Discs

21

( )

22

Conventions

24

TABLE DES MATIÈRES

25

Préparation

26

Emplacement

28

PHONE LEVEL

29

Remarque

30

PLAY MODE

31

Lecture de

32

Lecture d’un disque

33

Localisation d’une plage

36

Lecture de plages répétée

38

(lecture aléatoire) Z

39

(lecture programmée) Z

39

Ecoute d’un CD avec un

40

Informations

42

Remarques sur les disques

43

( )

44

Informations compl

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Printed in Japan

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