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Chapter 40 Differentiated Services
XGS-4526/4528F/4728F User’s Guide
355
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.
40.2.1 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 180
TRTCM - Color-blind Mode
40.2.2 TRTCM - Color-aware Mode
In color-aware mode the evaluation of the packets uses the existing packet loss
priority. TRTCM can increase a packet loss priority of a packet but it cannot
Exceed
PIR?
High Packet
Loss
Exceed
CIR?
Medium Packet
Loss
NO
YES
NO
YES
Low Packet
Loss
Содержание XGS-4528F
Страница 2: ......
Страница 8: ...Safety Warnings XGS 4526 4528F 4728F User s Guide 8...
Страница 24: ...Table of Contents XGS 4526 4528F 4728F User s Guide 24...
Страница 25: ...25 PART I User s Guide...
Страница 26: ...26...
Страница 32: ...Chapter 1 Getting to Know Your Switch XGS 4526 4528F 4728F User s Guide 32...
Страница 36: ...Chapter 2 Hardware Installation and Connection XGS 4526 4528F 4728F User s Guide 36...
Страница 93: ...93 PART II Technical Reference...
Страница 94: ...94...
Страница 100: ...Chapter 7 System Status and Port Statistics XGS 4526 4528F 4728F User s Guide 100...
Страница 116: ...Chapter 8 Basic Setting XGS 4526 4528F 4728F User s Guide 116...
Страница 136: ...Chapter 9 VLAN XGS 4526 4528F 4728F User s Guide 136...
Страница 140: ...Chapter 10 Static MAC Forward Setup XGS 4526 4528F 4728F User s Guide 140...
Страница 172: ...Chapter 14 Bandwidth Control XGS 4526 4528F 4728F User s Guide 172...
Страница 186: ...Chapter 17 Link Aggregation XGS 4526 4528F 4728F User s Guide 186...
Страница 196: ...Chapter 18 Port Authentication XGS 4526 4528F 4728F User s Guide 196...
Страница 214: ...Chapter 21 Policy Rule XGS 4526 4528F 4728F User s Guide 214...
Страница 258: ...Chapter 25 AAA XGS 4526 4528F 4728F User s Guide 258...
Страница 282: ...Chapter 26 IP Source Guard XGS 4526 4528F 4728F User s Guide 282...
Страница 314: ...Chapter 32 Error Disable XGS 4526 4528F 4728F User s Guide 314...
Страница 318: ...Chapter 33 Private VLAN XGS 4526 4528F 4728F User s Guide 318...
Страница 322: ...Chapter 34 Static Route XGS 4526 4528F 4728F User s Guide 322...
Страница 330: ...Chapter 36 RIP XGS 4526 4528F 4728F User s Guide 330...
Страница 386: ...Chapter 43 ARP Learning XGS 4526 4528F 4728F User s Guide 386...
Страница 396: ...Chapter 45 Maintenance XGS 4526 4528F 4728F User s Guide 396...
Страница 442: ...Chapter 49 Cluster Management XGS 4526 4528F 4728F User s Guide 442...
Страница 446: ...Chapter 50 MAC Table XGS 4526 4528F 4728F User s Guide 446...
Страница 450: ...Chapter 51 IP Table XGS 4526 4528F 4728F User s Guide 450...
Страница 454: ...Chapter 53 Routing Table XGS 4526 4528F 4728F User s Guide 454...
Страница 462: ...Chapter 55 Troubleshooting XGS 4526 4528F 4728F User s Guide 462...
Страница 472: ...Chapter 56 Product Specifications XGS 4526 4528F 4728F User s Guide 472...
Страница 480: ...Appendix B Legal Information XGS 4526 4528F 4728F User s Guide 480...