Layer 2 Switching Commands 658ACLs can be configured to apply to a VLAN instead of an interface. Traffictagged with a VLAN ID (either receive-tagged or tagged by ingress processsuch as PVID) is evaluated for a match regardless of the interface on which itis received.Layer 2 ACLsThe Layer 2 ACL feature provides access list capability by allowingclassification on the Layer 2 header of an Ethernet frame, including the802.1Q VLAN tag(s). In addition, the rule action set is enhanced to designatewhich (egress) CoS queue should handle the traffic, and whether the trafficflow is to be redirected to a specific outgoing interface.MAC access lists are identified by a user-specified name instead of a number.Layer 3/4 IPv4 ACLsThe Layer 3/4 ACL feature supports extended IP access lists. These lists checkthe Layer 3 portion of a packet, looking specifically at information containedin the IP header and, in certain cases, the TCP or UDP header. An EtherTypeof 0x0800 is assumed in the case of IP access lists. Permit and deny actions aresupported for each ACL rule.Standard layer 3/4 ACLs can be classified based on the source IP address andnetmask or other extended classification criteria.Class of Service (CoS)The Dell EMC Networking CoS Queuing feature allows the user to directlyconfigure device queuing and, therefore, provide the desired QoS behaviorwithout the complexities of DiffServ. The CoS feature allows the user todetermine the following queue behavior:• Queue Mapping– Trusted Port Queue Mapping– Untrusted Port Default Priority• Queue ConfigurationThis enables Dell EMC Networking switches to support a wide variety ofdelay sensitive video and audio multicast applications.
