Users Guide

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 eld set to 0 for “yellow” handling on queue 0 (default
queue).
Example: Color-marking non-ECN Packets in Dierent Trac
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 eld in their packet headers set to 0.
The rst example shows how to achieve the desired conguration 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 conguration 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
match ip access-group dscp_50_ecn
policy-map-input pmap_dscp_40_50
Quality of Service (QoS)
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