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command to select the type of TCM. See
mation.
Based on the TCM type used, packets are marked as follows:
TCM Type
Meter Compliance
Single-Rate
Packet is CIR/CBS compliant.
(srTCM)
Packet is not CIR/CBS compli-
ant but is CIR/PBS compliant.
Packet is neither CIR/CBS nor
CIR/PBS compliant.
Two-Rate
Packet is CIR/CBS compliant.
(trTCM)
Packet is not CIR/CBS compli-
ant but is PIR/PBS compliant.
Packet is neither CIR/CBS nor
PIR/PBS compliant.
Configuring Tri-Color Marking
Tri-Color Marking (TCM) is a supported technique for policing traffic. See
page 21-21
for an overview of how this implementation of TCM works.
Configuring TCM is done by creating a TCM policy action using the following QoS policy action
command parameters:
•
cir (Committed Information Rate, in bits per second)
•
cbs (Committed Burst Size, in bytes)
•
pir (Peak Information Rate, in bits per second)
•
pbs (Peak Burst Size, in bytes)
•
color-only (mark packet color only)
Consider the following when configuring TCM policy actions:
•
There is no explicit CLI command to specify the mode in which the TCM meter operates. This mode is
determined by whether or not the PIR is configured for the policy action and if the value of the PIR is
greater than the value of the specified CIR. In this case, the trTCM mode is triggered; otherwise, the
srTCM mode is used.
•
This implementation of TCM is in addition to the basic rate limiting capabilities provided through the
maximum bandwidth and maximum depth parameters used in QoS policy actions and the ingress and
egress bandwidth parameters used in VLAN Stacking Service Access Point (SAP) profiles. When these
parameters are used, the TCM meter operates in the Single-Rate TCM mode by default.
•
A srTCM policy action specifies both a CBS and PBS value. Default values for these burst sizes are
used if one is not specified using the optional cbs and pbs parameters.
page 21-22
"Configuring Tri-Color Marking" on page 21-22
Marker Color Result
GREEN
YELLOW
RED
GREEN
YELLOW
RED
OmniSwitch AOS Release 7 Network Configuration Guide
for more infor-
Packet is transmitted with the Drop
Precedence set to LOW.
Packet is transmitted with the Drop
Precedence set to HIGH (packet is
dropped first when congestion
occurs on the egress queue.
Packet is dropped at the ingress.
Packet is transmitted with the Drop
Precedence set to LOW.
Packet is transmitted with the Drop
Precedence set to HIGH (packet is
dropped first when congestion
occurs on the egress queue.
Packet is dropped at the ingress.
"Tri-Color Marking" on
March 2011
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