Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 737
Creating a Layer 2 Class Map, Determining the Order in Which ACLs are Used to Classify
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Creating a Layer 2 Class Map All class maps are Layer 3 by default; however, you can create a Layer 2 class map by specifying the layer2 option with the class-map command. A Layer 2 class map differentiates traffic according to 802.1p value and/or VLAN and/or characteristics defined in a MAC ACL.. Use Step 1 or Step 2 to start creating a Layer 2 class map. 1 Create a match-any class map. CONFIGURATION mode class-map match-any 2 Create a match-all class map. CONFIGURATION mode class-map match-all 3 Specify your match criteria. CLASS MAP mode [seq sequence number] match mac After you create a class-map, Dell EMC Networking OS places you in CLASS MAP mode. Match-any class maps allow up to five access-lists. Match-all class-maps allow only one. You can match against only one VLAN ID. 4 Link the class-map to a queue. POLICY MAP mode service-queue Determining the Order in Which ACLs are Used to Classify Traffic When you link class-maps to queues using the service-queue command, Dell EMC Networking OS 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, though you intended for these packets to match positive against cmap2 and be buffered in queue 4. In cases such as these, where class-maps with overlapping ACL rules are applied to different queues, use the keyword order. Dell EMC Networking OS writes to the CAM ACL rules with lower order numbers (order numbers closer to 0) 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 255. Quality of Service (QoS) 737
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