Configuring Link Aggregation 821M6348, M8024, and M8024-k switch or the external switch could goundetected and thus cause undesirable network behavior. Both static anddynamic LAGs (via LACP) can detect physical link failures within the LAGand continue forwarding traffic through the other connected links within thatsame LAG. LACP can also detect switch or port failures that do not result inloss of link. This provides a more resilient LAG. Best practices suggest usingdynamic link aggregation instead of static link aggregation.When a port isadded to a LAG as a static member, it neither transmits nor receives LACPPDUs.What is LAG Hashing?PowerConnect M6220, M6348, M8024, and M8024-k switches supportconfiguration of hashing algorithms for each LAG interface. The hashingalgorithm is used to distribute traffic load among the physical ports of theLAG while preserving the per-flow packet order.The hashing algorithm uses various packet attributes to determine theoutgoing physical port.The switch supports the following set of packet attributes to be used for hashcomputation:• Source MAC, VLAN, EtherType, and incoming port.• Destination MAC, VLAN, EtherType, and incoming port.• Source IP and Source TCP/UDP port numbers.• Destination IP and Destination TCP/UDP port numbers.• Source/Destination MAC, VLAN, EtherType, and incoming port.• Source/Destination IP and Source/Destination TCP/UDP port numbers.• Enhanced hashing modeEnhanced hashing mode has following advantages:• MODULO-N operation based on the number of ports in the LAG.• Packet attributes selection based on the packet type. For L2 packets,Source and Destination MAC address are used for hash computation. ForIP packets, Source IP, Destination IP address, TCP/UDP ports are used.• Non-Unicast traffic and Unicast traffic is hashed using a common hashalgorithm.• Excellent load balancing performance.
