Dell(conf) #service-pool wred yellow pool0 thresh-3 pool1 thresh-4Dell(conf) #service-pool wred weight pool0 11 pool1 4Guidelines for Configuring ECN for Classifying and Color-Marking PacketsKeep the following points in mind while configuring the marking and mapping of incoming packets usingECN fields in IPv4 headers:• Currently Dell Networking OS supports matching only the following TCP flags:– ACK– FIN– SYN– PSH– RST– URGIn 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 lessthan PIR would be considered as “Green” But ‘Green’ packets matching the specific match criteria forwhich ‘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 beover-written and marked as “Yellow”.Sample configuration to mark non-ecn packets as “yellow” with Multipletraffic classConsider the example where there are no different traffic classes that is all the packets are egressing onthe default ‘queue0’.Dell Networking OS can be configured as below to mark the non-ecn packets as yellow packets.!ip access-list standard ecn_0seq 5 permit any ecn 0class-map match-any ecn_0_cmapmatch ip access-group ecn_0 set-color yellow!734 Quality of Service (QoS)
