GS-2750 User’s Guide
157
C
H A P T E R
20
Queuing Method
This chapter introduces the queuing methods supported.
20.1 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.
20.1.1 Strictly Priority
Strictly Priority (SP) 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.
20.1.2 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 - see Figure 18 1)
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 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
1
x 100 Mbps = 3 Mbps
1+2+3+4+5+6+7+8
Summary of Contents for GS-2750
Page 2: ......
Page 7: ...Safety Warnings GS 2750 User s Guide 7 This product is recyclable Dispose of it properly ...
Page 8: ...Safety Warnings GS 2750 User s Guide 8 ...
Page 26: ...List of Figures GS 2750 User s Guide 26 ...
Page 32: ...32 ...
Page 40: ...Chapter 2 Hardware Installation and Connection GS 2750 User s Guide 40 ...
Page 48: ...48 ...
Page 58: ...Chapter 4 The Web Configurator GS 2750 User s Guide 58 ...
Page 64: ...Chapter 5 Initial Setup Example GS 2750 User s Guide 64 ...
Page 70: ...Chapter 6 System Status and Port Statistics GS 2750 User s Guide 70 ...
Page 82: ...Chapter 7 Basic Setting GS 2750 User s Guide 82 ...
Page 84: ...84 ...
Page 120: ...Chapter 11 Spanning Tree Protocol GS 2750 User s Guide 120 ...
Page 134: ...Chapter 15 Link Aggregation GS 2750 User s Guide 134 ...
Page 144: ...Chapter 17 Port Security GS 2750 User s Guide 144 ...
Page 155: ...Chapter 19 Policy Rule GS 2750 User s Guide 155 Figure 73 Policy Example example ...
Page 156: ...Chapter 19 Policy Rule GS 2750 User s Guide 156 ...
Page 160: ...Chapter 20 Queuing Method GS 2750 User s Guide 160 ...
Page 166: ...Chapter 21 VLAN Stacking GS 2750 User s Guide 166 ...
Page 194: ...Chapter 23 Authentication Accounting GS 2750 User s Guide 194 ...
Page 220: ...220 ...
Page 232: ...Chapter 28 Differentiated Services GS 2750 User s Guide 232 ...
Page 242: ...Chapter 29 DHCP GS 2750 User s Guide 242 ...
Page 252: ...Chapter 30 VRRP GS 2750 User s Guide 252 ...
Page 254: ...254 ...
Page 278: ...Chapter 32 Access Control GS 2750 User s Guide 278 ...
Page 280: ...Chapter 33 Diagnostic GS 2750 User s Guide 280 ...
Page 284: ...Chapter 34 Syslog GS 2750 User s Guide 284 ...
Page 298: ...Chapter 39 Routing Table GS 2750 User s Guide 298 ...
Page 301: ...301 PART VI Product Specifications Product Specifications 303 ...
Page 302: ...302 ...
Page 310: ...310 ...
Page 322: ...Appendix B Legal Information GS 2750 User s Guide 322 ...
Page 328: ...Appendix C Customer Support GS 2750 User s Guide 328 ...