Chapter 36 Differentiated Services
MGS3700-12C User’s Guide
343
Two Rate Three Color Marker (TRTCM, defined in RFC 2698) is a type of traffic
policing that identifies packets by comparing them to two user-defined rates: the
Committed Information Rate (CIR) and the Peak Information Rate (PIR). The CIR
specifies the average rate at which packets are admitted to the network. The PIR
is greater than or equal to the CIR. CIR and PIR values are based on the
guaranteed and maximum bandwidth respectively as negotiated between a
service provider and client.
Two Rate Three Color Marker evaluates incoming packets and marks them with
one of three colors which refer to packet loss priority levels. High packet loss
priority level is referred to as red, medium is referred to as yellow and low is
referred to as green. After TRTCM is configured and DiffServ is enabled the
following actions are performed on the colored packets:
• Red (high loss priority level) packets are dropped.
• Yellow (medium loss priority level) packets are dropped if there is congestion on
the network.
• Green (low loss priority level) packets are forwarded.
TRTCM operates in one of two modes: color-blind or color-aware. In color-blind
mode, packets are marked based on evaluating against the PIR and CIR
regardless of if they have previously been marked or not. In the color-aware
mode, packets are marked based on both existing color and evaluation against the
PIR and CIR. If the packets do not match any of colors, then the packets proceed
unchanged.
36.2.1 TRTCM-Color-blind Mode
All packets are evaluated against the PIR. If a packet exceeds the PIR it is marked
red. Otherwise it is evaluated against the CIR. If it exceeds the CIR then it is
marked yellow. Finally, if it is below the CIR then it is marked green.
Figure 172
TRTCM-Color-blind Mode
Exceed
PIR?
High Packet
Loss
Exceed
CIR?
Medium Packet
Loss
NO
YES
NO
YES
Low Packet
Loss
Содержание MGS3700-12C
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Страница 8: ...Safety Warnings MGS3700 12C User s Guide 8 ...
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Страница 30: ...Chapter 1 Getting to Know Your Switch MGS3700 12C User s Guide 30 ...
Страница 46: ...Chapter 3 Hardware Overview MGS3700 12C User s Guide 46 ...
Страница 56: ...Chapter 4 The Web Configurator MGS3700 12C User s Guide 56 ...
Страница 62: ...Chapter 5 Initial Setup Example MGS3700 12C User s Guide 62 ...
Страница 90: ...Chapter 6 Tutorials MGS3700 12C User s Guide 90 ...
Страница 91: ...91 PART II Basic Configuration System Status and Port Statistics 93 Basic Setting 99 ...
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Страница 114: ...Chapter 8 Basic Setting MGS3700 12C User s Guide 114 ...
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Страница 136: ...Chapter 9 VLAN MGS3700 12C User s Guide 136 ...
Страница 140: ...Chapter 10 Static MAC Forward Setup MGS3700 12C User s Guide 140 ...
Страница 172: ...Chapter 14 Bandwidth Control MGS3700 12C User s Guide 172 ...
Страница 204: ...Chapter 18 MGS3700 12C User s Guide 204 ...
Страница 210: ...Chapter 19 Port Security MGS3700 12C User s Guide 210 ...
Страница 218: ...Chapter 20 Classifier MGS3700 12C User s Guide 218 ...
Страница 226: ...Chapter 21 Policy Rule MGS3700 12C User s Guide 226 ...
Страница 294: ...Chapter 26 IP Source Guard MGS3700 12C User s Guide 294 ...
Страница 316: ...Chapter 31 Error Diable MGS3700 12C User s Guide 316 ...
Страница 330: ...Chapter 33 Private VLAN MGS3700 12C User s Guide 330 ...
Страница 334: ...Chapter 34 Green Ethernet MGS3700 12C User s Guide 334 ...
Страница 335: ...335 PART IV IP Application Static Route 337 Differentiated Services 341 DHCP 349 ...
Страница 336: ...336 ...
Страница 340: ...Chapter 35 Static Route MGS3700 12C User s Guide 340 ...
Страница 356: ...Chapter 37 DHCP MGS3700 12C User s Guide 356 ...
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Страница 366: ...Chapter 38 Maintenance MGS3700 12C User s Guide 366 ...
Страница 388: ...Chapter 39 Access Control MGS3700 12C User s Guide 388 ...
Страница 394: ...Chapter 41 Syslog MGS3700 12C User s Guide 394 ...
Страница 402: ...Chapter 42 Cluster Management MGS3700 12C User s Guide 402 ...
Страница 406: ...Chapter 43 MAC Table MGS3700 12C User s Guide 406 ...
Страница 411: ...Chapter 45 Configure Clone MGS3700 12C User s Guide 411 ...
Страница 412: ...Chapter 45 Configure Clone MGS3700 12C User s Guide 412 ...
Страница 413: ...413 PART VI Troubleshooting Product Specifications Troubleshooting 415 Product Specifications 419 ...
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Страница 428: ...Chapter 47 Product Specifications MGS3700 12C User s Guide 428 ...
Страница 429: ...429 PART VII Appendices and Index Common Services 431 Legal Information 435 Index 417 ...
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Страница 434: ...Appendix A Common Services MGS3700 12C User s Guide 434 ...
Страница 438: ...Appendix B Legal Information MGS3700 12C User s Guide 438 ...