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Configuring Quality of Service

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4. Configuring Quality of Service 4 Use the features in the QoS tab to configure Quality of Service (QoS) settings on the switch. The QoS tab contains links to the following features: • Class of Service on page 122 • Differentiated Services on page 129 In a typical switch, each physical port consists of one or more queues for transmitting packets on the attached network. Multiple queues per port are often provided to give preference to certain packets over others based on user-defined criteria. When a packet is queued for transmission in a port, the rate at which it is serviced depends on how the queue is configured and possibly the amount of traffic present in the other queues of the port. If a delay is necessary, packets get held in the queue until the scheduler authorizes the queue for transmission. As queues become full, packets have no place to be held for transmission and get dropped by the switch. QoS is a means of providing consistent, predictable data delivery by distinguishing between packets that have strict timing requirements from those that are more tolerant of delay. Packets with strict timing requirements are given "special treatment" in a QoS-capable network. With this in mind, all elements of the network must be QoS-capable. The presence of at least one node which is not QoS-capable creates a deficiency in the network path and the performance of the entire packet flow is compromised. Chapter 4: Configuring Quality of Service | 121

Section	Page
FS728TP Smart Switch	1
Table of Contents	3
1. Getting Started	9
Getting Started with the FS728TP Smart Switch	10
Switch Management Interface	11
Connecting the Switch to the Network	12
Switch Discovery in a Network with a DHCP Server	13
Switch Discovery in a Network without a DHCP Server	15
Configuring the Network Settings on the Administrative System	16
Web Access	18
Smart Control Center Utilities	19
Network Utilities	19
Configuration Upload and Download	20
Firmware Upgrade	22
Viewing and Managing Tasks	24
Understanding the User Interfaces	25
Using the Web Interface	25
Using SNMP	29
Interface Naming Convention	30
2. Configuring System Information	31
Management	32
System Information	32
IP Configuration	33
Time	35
Denial of Service	40
DNS	43
Green Ethernet Configuration	46
PoE	47
PoE Configuration	47
PoE Port Configuration	48
Timer Global Configuration	50
Timer Schedule Configuration	51
SNMP	53
SNMPV1/V2	53
Trap Flags	55
SNMP v3 User Configuration	57
LLDP	58
LLDP Configuration	58
LLDP Port Settings	59
LLDP-MED Network Policy	61
LLDP-MED Port Settings	62
Local Information	63
Neighbors Information	65
Services — DHCP Filtering	70
DHCP Filtering Configuration	70
Interface Configuration	71
3. Configuring Switching Information	73
Ports	74
Port Configuration	74
Flow Control	75
Link Aggregation Groups	77
LAG Configuration	77
LAG Membership	78
LACP Configuration	80
LACP Port Configuration	81
VLANs	82
VLAN Configuration	82
VLAN Membership Configuration	83
Port VLAN ID Configuration	84
Voice VLAN	87
Voice VLAN Properties	87
Voice VLAN Port Setting	88
Voice VLAN OUI	89
Spanning Tree Protocol	91
STP Switch Configuration	91
CST Configuration	93
CST Port Configuration	95
CST Port Status	96
Rapid STP	98
MST Configuration	98
MST Port Configuration	100
STP Statistics	102
Multicast	104
IGMP Snooping	104
IGMP Snooping Querier	112
Forwarding Database	116
MAC Address Table	116
Dynamic Address Configuration	117
Static MAC Address	118
4. Configuring Quality of Service	121
Class of Service	122
Basic CoS Configuration	122
CoS Interface Configuration	123
Interface Queue Configuration	125
802.1p to Queue Mapping	126
DSCP to Queue Mapping	127
Differentiated Services	129
Defining DiffServ	129
Diffserv Configuration	130
Class Configuration	131
Policy Configuration	134
Service Configuration	137
Service Statistics	138
5. Managing Device Security	141
Management Security Settings	142
Change Password	142
RADIUS Configuration	143
Configuring TACACS+	148
Authentication List Configuration	151
Configuring Management Access	153
HTTP Configuration	153
Secure HTTP Configuration	154
Certificate Download	155
Access Profile Configuration	157
Access Rule Configuration	158
Port Authentication	160
802.1X Configuration	160
Port Authentication	161
Port Summary	165
Traffic Control	166
MAC Filter Configuration	166
MAC Filter Summary	168
Storm Control	168
Port Security Configuration	170
Port Security Interface Configuration	171
Security MAC Address	172
Protected Ports Membership	173
Configuring Access Control Lists	174
MAC ACL	174
MAC Rules	175
MAC Binding Configuration	177
MAC Binding Table	178
IP ACL	179
IP Rules	181
IP Extended Rule	182
IP Binding Configuration	185
IP Binding Table	187
6. Monitoring the System	189
Ports	190
Switch Statistics	190
Port Statistics	192
Port Detailed Statistics	193
EAP Statistics	200
Cable Test	201
System Logs	203
Memory Logs	203
FLASH Log Configuration	205
Server Log Configuration	207
Trap Logs	208
Event Logs	210
Port Mirroring	211
Multiple Port Mirroring	211
7. Maintenance	213
Reset	214
Device Reboot	214
Factory Default	214
Upload File From Switch	216
TFTP File Upload	216
HTTP File Upload	217
Download File To Switch	219
TFTP File Download	219
HTTP File Download	221
File Management	223
Dual Image Configuration	223
Dual Image Status	224
Troubleshooting	226
Ping	226
Traceroute	227
8. Help	229
Online Help	229
Support	229
User Guide	230
A. Hardware Specifications and Default Values	232
FS728TP Smart Switch Specifications	232
FS728TP Switch Features and Defaults	233
B. Configuration Examples	237
Virtual Local Area Networks (VLANs)	238
VLAN Example Configuration	239
Access Control Lists (ACLs)	240
MAC ACL Example Configuration	240
Standard IP ACL Example Configuration	242
Differentiated Services (DiffServ)	243
Class	243
DiffServ Traffic Classes	244
Creating Policies	244
DiffServ Example Configuration	245
802.1X	247
802.1X Example Configuration	248
MSTP	250
MSTP Example Configuration	251
C. Notification of Compliance	254

Match case Limit results 1 per page

Chapter 4:

Configuring Quality

Service

121

Configuring Quality

of Service

Use the features in the QoS tab to configure Quality of Service (QoS) settings on the switch. The

QoS tab contains links to the following features:

•

Class of Service

on page

122

•

Differentiated Services

on page

129

In a typical switch, each physical port consists of one or more queues for transmitting packets on

the attached network. Multiple queues per port are often provided to give preference to certain

packets over others based on user-defined criteria. When a packet is queued for transmission in

a port, the rate at which it is serviced depends on how the queue is configured and possibly the

amount of traffic present in the other queues of the port. If a delay is necessary, packets get held

in the queue until the scheduler authorizes the queue for transmission. As queues become full,

packets have no place to be held for transmission and get dropped by the switch.

QoS is a means of providing consistent, predictable data delivery by distinguishing between

packets that have strict timing requirements from those that are more tolerant of delay. Packets

with strict timing requirements are given “special treatment” in a QoS-capable network. With this

in mind, all elements of the network must be QoS-capable. The presence of at least one node

which is not QoS-capable creates a deficiency in the network path and the performance of the

entire packet flow is compromised.