Administrator Guide

class-map match-any ecn_0_cmap
match ip access-group ecn_0 set-color yellow
policy-map-input ecn_0_pmap
service-queue 0 class-map ecn_0_cmap
Applying the policy map “ecn_0_pmap” marks all incoming packets with the ECN field set to 0 for “yellow” handling on queue 0
(default queue).
Example: Color-marking non-ECN Packets in Different Traffic
Classes
The following examples both show how to mark non-ECN packets for “yellow” handling when packets with DCSP 40 egress on
queue 2 and packets with DSCP 50 egress on queue 3. Non-ECN-capable packets have the ECN field in their packet headers
set to 0.
The first example shows how to achieve the desired configuration without specifying ECN match criteria to classify ECN-
capable packets:
ip access-list standard dscp_50
seq 5 permit any dscp 50
ip access-list standard dscp_40
seq 5 permit any dscp 40
ip access-list standard dscp_50_non_ecn
seq 5 permit any dscp 50 ecn 0
ip access-list standard dscp_40_non_ecn
seq 5 permit any dscp 40 ecn 0
class-map match-any class_dscp_40
match ip access-group dscp_40_non_ecn set-color yellow
match ip access-group dscp_40
class-map match-any class_dscp_50
match ip access-group dscp_50_non_ecn set-color yellow
match ip access-group dscp_50
policy-map-input pmap_dscp_40_50
service-queue 2 class-map class_dscp_40
service-queue 3 class-map class_dscp_50
The second example shows how to achieve the desired configuration by specifying ECN match criteria to classify ECN-capable
packets:
ip access-list standard dscp_50_ecn
seq 5 permit any dscp 50 ecn 1
seq 10 permit any dscp 50 ecn 2
seq 15 permit any dscp 50 ecn 3
ip access-list standard dscp_40_ecn
seq 5 permit any dscp 40 ecn 1
seq 10 permit any dscp 40 ecn 2
seq 15 permit any dscp 40 ecn 3
ip access-list standard dscp_50_non_ecn
seq 5 permit any dscp 50 ecn 0
ip access-list standard dscp_40_non_ecn
seq 5 permit any dscp 40 ecn 0
class-map match-any class_dscp_40
match ip access-group dscp_40_non_ecn set-color yellow
match ip access-group dscp_40_ecn
class-map match-any class_dscp_50
match ip access-group dscp_50_non_ecn set-color yellow
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Quality of Service (QoS)