Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 760

INTERFACE mode Dell(conf-if-te-0/8)#Service-class buffer shared-threshold-weight Guidelines for Configuring ECN for Classifying and ColorMarking Packets Keep the following points in mind while configuring the marking and mapping of incoming packets using ECN fields in IPv4 headers: • Currently Dell Networking OS supports matching only the following TCP flags: - ACK - FIN - SYN - PSH - RST - URG In the existing software, ECE/CWR TCP flag qualifiers are not supported. • Because this functionality forcibly marks all the packets matching the specific match criteria as 'yellow', Dell Networking OS does not support Policer based coloring and this feature concurrently. • If single rate two color policer is configured along with this feature, then by default all packets less than PIR would be considered as "Green" But 'Green' packets matching the specific match criteria for which 'color-marking' is configured will be over-written and marked as "Yellow". • If two rate three color policer is configured along with this feature then, - x < CIR - will be marked as "Green" - CIR < x< PIR - will be marked as "Yellow" - PIR < x - will be marked as "Red" But 'Green' packets matching the specific match criteria for which 'color-marking' is configured will be over-written and marked as "Yellow". Sample configuration to mark non-ecn packets as "yellow" with Multiple traffic class Consider the example where there are no different traffic classes that is all the packets are egressing on the default 'queue0'. Dell Networking OS can be configured as below to mark the non-ecn packets as yellow packets. ! ip access-list standard ecn_0 seq 5 permit any ecn 0 class-map match-any ecn_0_cmap match ip access-group ecn_0 set-color yellow ! 760 Quality of Service (QoS)