Trtcm-Color-Blind Mode; Trtcm-Color-Aware Mode; Activating Diffserv - ZyXEL Communications VES1724-56 User Manual

Chapter 35 Differentiated Services

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 181 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 182 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).
300
Exceed NO
PIR?
YES
High Packet
Loss
NO
Exceed
Red?
PIR?
YES YES
High Packet High Packet
Loss Loss
Exceed
NO
CIR?
YES
Medium Packet
Loss
NO
NO
Yellow?
YES
Medium Packet
Medium Packet
Loss
Low Packet
Loss
NO
Exceed
Low Packet
Loss
CIR?
YES
Loss
VES1724-56 User's Guide