Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 754
Guidelines for Configuring ECN for Classifying and Color-Marking Packets
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mode DellEMC(conf) #service-pool wred green pool0 thresh-1 pool1 thresh-2 DellEMC(conf) #service-pool wred yellow pool0 thresh-3 pool1 thresh-4 DellEMC(conf) #service-pool wred weight pool0 11 pool1 4 5 Create a service class and associate the threshold weight of the shared buffer with each of the queues per port in the egress direction. INTERFACE mode DellEMC(conf-if-te-0/8)#Service-class buffer shared-threshold-weight Guidelines for Configuring ECN for Classifying and Color-Marking Packets Keep the following points in mind while configuring the marking and mapping of incoming packets using ECN fields in IPv4 headers: • Currently Dell EMC 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 EMC 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 EMC 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 0 754 Quality of Service (QoS)
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