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MGS3700-12C User’s Guide
227
C
H A P T E R
2 2
Queuing Method
This chapter introduces the queuing methods supported.
22.1 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
Switch Setup
and
802.1p Priority
in
Port Setup
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.
22.1.1 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, Q7 is transmitted first.
When that queue empties, traffic on the next highest-priority queue, Q6 is
transmitted until Q6 empties, and then traffic is transmitted on Q5 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.
22.1.2 Weighted Fair Queuing
Weighted Fair Queuing is used to guarantee each queue's minimum bandwidth
based on its bandwidth weight (portion) (the number you configure in the Weight
field) 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 Q0 is 1, for Q1 is 2, for Q2 is 3, and so on.
Guaranteed quantum is calculated as Queue Weight x 2048 bytes.
Summary of Contents for MGS3700-12C
Page 2: ......
Page 8: ...Safety Warnings MGS3700 12C User s Guide 8 ...
Page 24: ...24 ...
Page 30: ...Chapter 1 Getting to Know Your Switch MGS3700 12C User s Guide 30 ...
Page 46: ...Chapter 3 Hardware Overview MGS3700 12C User s Guide 46 ...
Page 56: ...Chapter 4 The Web Configurator MGS3700 12C User s Guide 56 ...
Page 62: ...Chapter 5 Initial Setup Example MGS3700 12C User s Guide 62 ...
Page 90: ...Chapter 6 Tutorials MGS3700 12C User s Guide 90 ...
Page 91: ...91 PART II Basic Configuration System Status and Port Statistics 93 Basic Setting 99 ...
Page 92: ...92 ...
Page 114: ...Chapter 8 Basic Setting MGS3700 12C User s Guide 114 ...
Page 116: ...116 ...
Page 136: ...Chapter 9 VLAN MGS3700 12C User s Guide 136 ...
Page 140: ...Chapter 10 Static MAC Forward Setup MGS3700 12C User s Guide 140 ...
Page 172: ...Chapter 14 Bandwidth Control MGS3700 12C User s Guide 172 ...
Page 204: ...Chapter 18 MGS3700 12C User s Guide 204 ...
Page 210: ...Chapter 19 Port Security MGS3700 12C User s Guide 210 ...
Page 218: ...Chapter 20 Classifier MGS3700 12C User s Guide 218 ...
Page 226: ...Chapter 21 Policy Rule MGS3700 12C User s Guide 226 ...
Page 294: ...Chapter 26 IP Source Guard MGS3700 12C User s Guide 294 ...
Page 316: ...Chapter 31 Error Diable MGS3700 12C User s Guide 316 ...
Page 330: ...Chapter 33 Private VLAN MGS3700 12C User s Guide 330 ...
Page 334: ...Chapter 34 Green Ethernet MGS3700 12C User s Guide 334 ...
Page 335: ...335 PART IV IP Application Static Route 337 Differentiated Services 341 DHCP 349 ...
Page 336: ...336 ...
Page 340: ...Chapter 35 Static Route MGS3700 12C User s Guide 340 ...
Page 356: ...Chapter 37 DHCP MGS3700 12C User s Guide 356 ...
Page 358: ...358 ...
Page 366: ...Chapter 38 Maintenance MGS3700 12C User s Guide 366 ...
Page 388: ...Chapter 39 Access Control MGS3700 12C User s Guide 388 ...
Page 394: ...Chapter 41 Syslog MGS3700 12C User s Guide 394 ...
Page 402: ...Chapter 42 Cluster Management MGS3700 12C User s Guide 402 ...
Page 406: ...Chapter 43 MAC Table MGS3700 12C User s Guide 406 ...
Page 411: ...Chapter 45 Configure Clone MGS3700 12C User s Guide 411 ...
Page 412: ...Chapter 45 Configure Clone MGS3700 12C User s Guide 412 ...
Page 414: ...414 ...
Page 428: ...Chapter 47 Product Specifications MGS3700 12C User s Guide 428 ...
Page 429: ...429 PART VII Appendices and Index Common Services 431 Legal Information 435 Index 417 ...
Page 430: ...430 ...
Page 434: ...Appendix A Common Services MGS3700 12C User s Guide 434 ...
Page 438: ...Appendix B Legal Information MGS3700 12C User s Guide 438 ...