242 Cisco LAN Switching Configuration Handbook
The policer can take the following actions based on how it measures the
traffic rate:
â– Conforming (in-profile, less than the CIR): Forwarded by default. An IOS
switch allows a conform-action to be taken instead: drop (the frame is
dropped and not forwarded), set-dscp-transmit new-dscp (the DSCP is set
to new-dscp), set-prec-transmit new-precedence (the IP precedence is set
to new-precedence) or transmit (the frame is forwarded as is).
â– Exceeding (out-of-profile, exceeds the CIR): Dropped by default. An IOS
switch enables an exceed-action to be taken: drop (the frame is dropped
and not forwarded), policed-dscp-transmit (the internal DSCP value is
marked down by a mapping), or transmit (the frame is forwarded as is).
â– Violating (out-of-profile, exceeds the PIR): By default, the action is the
same as the Exceeding action. An IOS switch enables a violate-action to be
taken: drop (the frame is dropped and not forwarded), policed-dscp-trans-
mit (the internal DSCP value is marked down by a mapping), or transmit
(the frame is forwarded as is).
e. Attach the policy to the port:
(interface) service-policy input policy-name
The policy (COS: acl-name; IOS: policy-name) is attached to the switch port for
immediate use on ingress traffic. If the policy will be used for VLAN QoS, it is
attached to the VLAN number vlan or the VLAN interface.
9. (Optional) Tune the egress port queues.
Tip By default, the egress ports use the congestion avoidance and scheduling, as listed in
Table 13-5.
All port types assign frames with CoS 5 to their strict-priority queues (except 2q2t, which
has none).
a. (Optional) Tune the egress queue ratio:
(interface) wrr-queue queue-limit queue1 queue2 [queue3] queue-priority
Caution When this command is used, all ports cycle through a link-down and link-up
process.
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