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ZyXEL Communications MES3500-24F User Manual

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Chapter 35 Differentiated Services
MES3500-24/24F User’s Guide
270
35.2.1  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 153   
TRTCM-Color-blind Mode 
35.2.2  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 decrease it. Packets that have been 
previously marked red or yellow can only be marked with an equal or higher packet loss priority. 
Packets marked red (high packet loss priority) continue to be red without evaluation against the PIR 
or CIR. Packets marked yellow can only be marked red or remain yellow so they are only evaluated 
against the PIR. Only the packets marked green are first evaluated against the PIR and then if they 
don’t exceed the PIR level are they evaluated against the CIR. 
Figure 154   
TRTCM-Color-aware Mode 
35.3  Activating DiffServ  
Activate DiffServ to apply marking rules or IEEE 802.1p priority mapping on the selected port(s). 
Exceed
   PIR?
High Packet
    
Loss
Exceed
   CIR?
Medium Packet
    
Loss
NO
YES
NO
YES
Low Packet
  
Loss
Exceed
  PIR?
High Packet
    
Loss
Exceed
   CIR?
Medium Packet
    
Loss
NO
YES
NO
YES
Low Packet
  
Loss
   
High Packet
    
Loss
NO
YES
Red?
   Yellow?
Medium Packet
    
Loss
NO
YES