Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 848

CONFIGURATION mode Dell(conf)#policy-map-input pp_policmap 7. Create a service queue to associate the class map and QoS policy map. POLICY-MAP mode Dell(conf-policy-map-in)#service-queue 0 class-map pp_classmap qos-policy pp_qospolicy Ordering ACL Rules When 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 packets before 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 cmap1 and are buffered in queue 7, although you intended for these packets to match positive against cmap2 and be buffered in queue 4. When class-maps with overlapping ACL rules are applied to different queues, use the keyword order to process ACL rules in the desired order. ACL rules with lower order numbers (order numbers closer to 0) are applied 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. order The order can range from 0 to 254. By default, all ACL rules have an order of 254. Displaying Configured Class Maps and Match Criteria To 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. In the following example, traffic is classified in two Queues, 1 and 2. Class-map ClassAF1 is "match any," and ClassAF2 is "match all". • Display all class-maps or a specific class map. EXEC Privilege mode show qos class-map Examples of Traffic Classifications The following example shows incorrect traffic classifications. Dell#show running-config policy-map-input ! policy-map-input PolicyMapIn service-queue 1 class-map ClassAF1 qos-policy QosPolicyIn-1 service-queue 2 class-map ClassAF2 qos-policy QosPolicyIn-2 Dell#show running-config class-map ! class-map match-any ClassAF1 match ip access-group AF1-FB1 set-ip-dscp 10 848 Quality of Service (QoS)