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Chapter 39 Differentiated Services
XGS4700-48F User’s Guide
353
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.
39.2.1 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 183
TRTCM - Color-blind Mode
39.2.2 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
Summary of Contents for XGS4700 Series
Page 2: ......
Page 8: ...Safety Warnings XGS4700 48F User s Guide 8...
Page 24: ...Table of Contents XGS4700 48F User s Guide 24...
Page 25: ...25 PART I User s Guide...
Page 26: ...26...
Page 32: ...Chapter 1 Getting to Know Your Switch XGS4700 48F User s Guide 32...
Page 54: ...Chapter 3 Hardware Overview XGS4700 48F User s Guide 54...
Page 97: ...97 PART II Technical Reference...
Page 98: ...98...
Page 104: ...Chapter 7 System Status and Port Statistics XGS4700 48F User s Guide 104...
Page 118: ...Chapter 8 Basic Setting XGS4700 48F User s Guide 118...
Page 138: ...Chapter 9 VLAN XGS4700 48F User s Guide 138...
Page 142: ...Chapter 10 Static MAC Forward Setup XGS4700 48F User s Guide 142...
Page 174: ...Chapter 14 Bandwidth Control XGS4700 48F User s Guide 174...
Page 188: ...Chapter 17 Link Aggregation XGS4700 48F User s Guide 188...
Page 198: ...Chapter 18 Port Authentication XGS4700 48F User s Guide 198...
Page 216: ...Chapter 21 Policy Rule XGS4700 48F User s Guide 216...
Page 260: ...Chapter 25 AAA XGS4700 48F User s Guide 260...
Page 284: ...Chapter 26 IP Source Guard XGS4700 48F User s Guide 284...
Page 316: ...Chapter 32 Error Disable XGS4700 48F User s Guide 316...
Page 320: ...Chapter 33 Static Route XGS4700 48F User s Guide 320...
Page 328: ...Chapter 35 RIP XGS4700 48F User s Guide 328...
Page 384: ...Chapter 42 ARP Learning XGS4700 48F User s Guide 384...
Page 420: ...Chapter 45 Access Control XGS4700 48F User s Guide 420...
Page 426: ...Chapter 47 Syslog XGS4700 48F User s Guide 426...
Page 434: ...Chapter 48 Cluster Management XGS4700 48F User s Guide 434...
Page 438: ...Chapter 49 MAC Table XGS4700 48F User s Guide 438...
Page 442: ...Chapter 50 IP Table XGS4700 48F User s Guide 442...
Page 446: ...Chapter 52 Routing Table XGS4700 48F User s Guide 446...
Page 454: ...Chapter 54 Troubleshooting XGS4700 48F User s Guide 454...
Page 464: ...Chapter 55 Product Specifications XGS4700 48F User s Guide 464...
Page 473: ...Appendix B Legal Information XGS4700 48F User s Guide 473...
Page 474: ...Appendix B Legal Information XGS4700 48F User s Guide 474...