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QoS Overview
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Meter Modes
The 7210 SAS devices supports following meter modes:
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In srtcm the CBS and MBS Token buckets are replenished at single rate, that is, CIR where as in
case of trtcm CBS and MBS buckets are individually replenished at CIR and PIR rates,
respectively. trtcm1 implements the policing algorithm defined in RFC2698 and trtcm2
implements the policing algorithm defined in RFC4115.
Color Aware Policing
The 7210 SAS devices support Color Aware policing at the network ingress, where as at service
ingress policing an option is provided to use either color-aware policing or color-blind policing. In
color aware policing user can define the color of the packet using the classification and feed those
colored packets to the meter. A color aware meter would treat those packets with respect to the
color defined.
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The profile marked by the meter is used to determine the packets eligibility to be enqueued into a
buffer at the egress (when a slope policy is configured at the egress).
In color-blind mode, the profile/color assigned to the packet on ingress is ignored. The CIR and
PIR rate configured for the meter is used to determine the final color/profile for the packet. If the
packet is within the CIR, then the final profile/color assigned to the packet is in-profile/green and
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7210 SAS-X and 7210 SAS-R6 OS Quality of Service Guide
Counters for packets or octets marked as in-profile by meter
Counters for packets or octets marked as out-of-profile by meter
srtcm: Single Rate Three Color Marking
trtcm: Two Rate Three Color Marking
trtcm1:Two Rate Three Color Marking1 (Applicable only for Service Ingress QoS
Policies)
trtcm2:Two Rate Three Color Marking2 (Applicable only for Service Ingress QoS
Policies)
If the packet is pre-colored as in-profile (or also called as Green colored packets) then
depending on the burst size of the packet meter can either mark it in-profile or out-profile.
If the packet is pre-colored as out-profile (also called as Yellow colored packets) then even
if the packet burst is lesser than the current available CBS, it would not be marked as in-
profile and remain as out-profile.
If the packet burst is higher than the MBS then it would be marked as Red and would be
dropped by meter at ingress.
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