QOS-POLICY-IN modeDell(conf-qos-policy-in)#set ip-dscp 56 Create an input policy map.CONFIGURATION modeDell(conf)#policy-map-input pp_policmap7 Create a service queue to associate the class map and QoS policy map.POLICY-MAP modeDell(conf-policy-map-in)#service-queue 0 class-map pp_classmap qos-policypp_qospolicyOrdering ACL RulesWhen you link class-maps to queues using the service-queue command, the system matches the class-maps according to queue priority (queue numbers closer to 0 have lower priorities).For example, as described in the previous example, class-map cmap2 is matched against ingress packetsbefore cmap1.ACLs acl1 and acl2 have overlapping rules because the address range 20.1.1.0/24 is within 20.0.0.0/8.Therefore (without the keyword order), packets within the range 20.1.1.0/24 match positive against cmap1and are buffered in queue 7, although you intended for these packets to match positive against cmap2 and bebuffered in queue 4.When class-maps with overlapping ACL rules are applied to different queues, use the keyword order toprocess ACL rules in the desired order. ACL rules with lower order numbers (order numbers closer to 0) areapplied before rules with higher order numbers so that packets are matched as you intended.• Specify the order in which you want to apply ACL rules using the keyword order.orderThe order can range from 0 to 254.By default, all ACL rules have an order of 254.Displaying Configured Class Maps and Match CriteriaTo display all class-maps or a specific class map, use the following command.Dell Networking OS Behavior: An explicit “deny any" rule in a Layer 3 ACL used in a (match any or match all)class-map creates a "default to Queue 0" entry in the CAM, which causes unintended traffic classification. Inthe following example, traffic is classified in two Queues, 1 and 2. Class-map ClassAF1 is “match any,” andClassAF2 is “match all”.• Display all class-maps or a specific class map.EXEC Privilege modeshow qos class-mapExamples of Traffic ClassificationsThe following example shows incorrect traffic classifications.Dell#show running-config policy-map-input!Quality of Service (QoS) 914
