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Queuing Method, 12.1 Queuing Method Overview, 12.1.1 Strictly Priority Queuing, 12.1.2 Weighted Fair

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CHAPTER 12 Queuing Method This chapter introduces the queuing methods supported. 12.1 Queuing Method Overview Queuing is used to help solve performance degradation when there is network congestion. Use the Queuing Method screen to configure queuing algorithms for outgoing traffic. See also Priority Queue Assignment in the Basic > Switch Setup screen and 802.1p Priority in the Basic > Port Setup screen for related information. Queuing algorithms allow switches to maintain separate queues for packets from each individual source or flow and prevent a source from monopolizing the bandwidth. 12.1.1 Strictly Priority Queuing Strictly Priority Queuing (SPQ) services queues based on priority only. As traffic comes into the Switch, traffic on the highest priority queue, Q3 is transmitted first. When that queue empties, traffic on the next highest-priority queue, Q2 is transmitted until Q2 empties, and then traffic is transmitted on Q1 and so on. If higher priority queues never empty, then traffic on lower priority queues never gets sent. SP does not automatically adapt to changing network requirements. 12.1.2 Weighted Fair Queuing Weighted Fair Queuing is used to guarantee each queue's minimum bandwidth based on its bandwidth weight (portion) when there is traffic congestion. WFQ is activated only when a port has more traffic than it can handle. Queues with larger weights get more guaranteed bandwidth than queues with smaller weights. This queuing mechanism is highly efficient in that it divides any available bandwidth across the different traffic queues. By default, the weight for each queue is 1. Guaranteed bandwidth is calculated as follows: Queue Weight x Port Speed Total Queue Weight For example, using the default setting, Q0 on Port 1 gets a guaranteed bandwidth of: 1 1+2+3+4 x 100 Mbps = 10 Mbps ES-315/ES-315-F User's Guide 71

Section	Page
User’s Guide	1
About This User's Guide	3
Document Conventions	4
Safety Warnings	6
Contents Overview	9
Table of Contents	11
List of Figures	17
List of Tables	19
Introduction and Hardware	21
Getting to Know Your Switch	23
1.1 Introduction	23
1.1.1 Overview	23
1.1.2 IEEE 802.1Q VLAN Application Example	23
1.2 Ways to Manage the Switch	24
1.3 Good Habits for Managing the Switch	24
Hardware Overview	27
2.1 LEDs	27
2.2 Rear and Base Panels	28
Basic Configuration	31
The Web Configurator	33
3.1 Introduction	33
3.2 System Login	33
3.3 The Status Screen	34
3.3.1 Change Your Password	36
3.4 Saving Your Configuration	37
3.5 Switch Lockout	37
3.6 Resetting the Switch	38
3.7 Logging Out of the Web Configurator	38
3.8 Help	38
Initial Setup Example	39
4.1 Overview	39
4.1.1 Creating a VLAN	39
4.1.2 Setting Port VID	40
4.2 Configuring Switch Management IP Address	41
System Status and Port Statistics	43
5.1 Overview	43
5.2 Port Status Summary	43
5.2.1 Status: Port Details	44
Basic Setting	47
6.1 Overview	47
6.2 System Information	47
6.3 General Setup	48
6.4 Introduction to VLANs	49
6.5 Switch Setup Screen	49
6.6 IP Setup	51
6.6.1 Management IP Addresses	51
6.7 Port Setup	53
Advanced	55
VLAN	57
7.1 Introduction to IEEE 802.1Q Tagged VLANs	57
7.1.1 Forwarding Tagged and Untagged Frames	57
7.2 Static VLAN	58
7.2.1 Static VLAN Status	58
7.2.2 Static VLAN Details	58
7.2.3 Configure a Static VLAN	59
7.2.4 Configure VLAN Port Settings	61
Static MAC Forward Setup	63
8.1 Overview	63
8.2 Configuring Static MAC Forwarding	63
Filtering	65
9.1 Configure a Filtering Rule	65
Broadcast Storm Control	67
10.1 Broadcast Storm Control Setup	67
Bandwidth Control	69
11.1 Bandwidth Control Overview	69
11.2 Bandwidth Control Setup	69
Queuing Method	71
12.1 Queuing Method Overview	71
12.1.1 Strictly Priority Queuing	71
12.1.2 Weighted Fair Queuing	71
12.2 Configuring Queuing	72
Multicast	73
13.1 Multicast Overview	73
13.1.1 IP Multicast Addresses	73
13.1.2 IGMP Filtering	73
13.1.3 IGMP Snooping	73
13.2 Multicast Status	74
13.3 Multicast Setting	74
13.4 IGMP Filtering Profile	76
13.5 MVR Overview	77
13.5.1 Types of MVR Ports	78
13.5.2 MVR Modes	78
13.5.3 How MVR Works	78
13.6 General MVR Configuration	79
13.7 MVR Group Configuration	81
13.7.1 MVR Configuration Example	82
IP Application	85
Static Route	87
14.1 Static Routing Overview	87
14.2 Configuring Static Routing	87
Management	91
Maintenance	93
15.1 The Maintenance Screen	93
15.2 Load Factory Default	94
15.3 Save Configuration	94
15.4 Reboot System	94
15.5 Firmware Upgrade	95
15.6 Restore a Configuration File	95
15.7 Backup a Configuration File	96
15.8 FTP Command Line	96
15.8.1 Filename Conventions	97
15.8.2 FTP Command Line Procedure	97
15.8.3 GUI-based FTP Clients	98
15.8.4 FTP Restrictions	98
Access Control	99
16.1 Access Control Overview	99
16.2 The Access Control Main Screen	99
16.3 About SNMP	100
16.3.1 Supported MIBs	101
16.3.2 SNMP Traps	101
16.3.3 Configuring SNMP	103
16.3.4 Setting Up Login Accounts	104
16.4 SSH Overview	105
16.5 How SSH works	105
16.6 SSH Implementation on the Switch	106
16.6.1 Requirements for Using SSH	106
16.7 Introduction to HTTPS	107
16.8 HTTPS Example	107
16.8.1 Internet Explorer Warning Messages	108
16.8.2 Netscape Navigator Warning Messages	108
16.8.3 The Main Screen	109
16.9 Service Port Access Control	109
16.10 Remote Management	110
Diagnostic	113
17.1 Diagnostic	113
Syslog	115
18.1 Syslog Overview	115
18.2 Syslog Setup	115
18.3 Syslog Server Setup	116
MAC Table	119
19.1 MAC Table Overview	119
19.2 Viewing the MAC Table	120
ARP Table	121
20.1 ARP Table Overview	121
20.1.1 How ARP Works	121
20.2 Viewing the ARP Table	121
Troubleshooting and Product Specifications	125
Troubleshooting	127
21.1 Power, Hardware Connections, and LEDs	127
21.2 Switch Access and Login	128
Product Specifications	131
22.1 General Switch Specifications	131
22.2 Wall-mounting Instructions	134
Appendices and Index	137
IP Addresses and Subnetting	139
Common Services	149
Legal Information	153
Customer Support	157

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ES-315/ES-315-F User’s Guide

HAPTER

Queuing Method

This chapter introduces the queuing methods supported.

12.1

Queuing Method Overview

Queuing is used to help solve performance degradation when there is network congestion. Use

the

Queuing Method

screen to configure queuing algorithms for outgoing traffic. See also

Priority Queue Assignment

in the

Basic

Switch Setup

screen

and

802.1p Priority

in the

Basic

Port Setup

screen for related information.

Queuing algorithms allow switches to maintain separate queues for packets from each

individual source or flow and prevent a source from monopolizing the bandwidth.

12.1.1

Strictly Priority Queuing

Strictly Priority Queuing (SPQ) services queues based on priority only. As traffic comes into

the Switch, traffic on the highest priority queue, Q3 is transmitted first. When that queue

empties, traffic on the next highest-priority queue, Q2 is transmitted until Q2 empties, and

then traffic is transmitted on Q1 and so on. If higher priority queues never empty, then traffic

on lower priority queues never gets sent. SP does not automatically adapt to changing network

requirements.

12.1.2

Weighted Fair Queuing

Weighted Fair Queuing is used to guarantee each queue's minimum bandwidth based on its

bandwidth weight (portion) when there is traffic congestion. WFQ is activated only when a

port has more traffic than it can handle. Queues with larger weights get more guaranteed

bandwidth than queues with smaller weights. This queuing mechanism is highly efficient in

that it divides any available bandwidth across the different traffic queues. By default, the

weight for each queue is 1. Guaranteed bandwidth is calculated as follows:

For example, using the default setting, Q0 on Port 1 gets a guaranteed bandwidth of:

Queue Weight

x Port Speed

Total Queue Weight

x 100 Mbps = 10 Mbps

1+2+3+4