Dell N3200-ON Networking N-Series Switches User Guide version 6.8.0 - Page 1043

thus cause undesirable network behavior. Both static and dynamic LAGs (via LACP) can detect physical link failures within the LAG and continue forwarding traffic through the other connected links within that same LAG. LACP can also detect switch or port failures that do not result in loss of link. This provides a more resilient LAG. Best practices suggest using dynamic link aggregation instead of static link aggregation. When a port is added to a LAG as a static member, it neither transmits nor receives LACP PDUs. What is LAG Hashing? Dell Networking N-Series switches support configuration of hashing algorithms for each LAG interface. The hashing algorithm is used to distribute traffic load among the physical ports of the LAG while preserving the per-flow packet order. Enhanced hashing mode is the recommended and default hashing mode for Dell Networking N-Series switches. The hashing algorithm uses various packet attributes to determine the outgoing physical port. The switch supports the following set of packet attributes to be used for hash computation: • Source MAC, VLAN, EtherType, source module, and incoming port. • Destination MAC, VLAN, EtherType, source module, and incoming port. • Source IP and Source TCP/UDP port numbers. • Destination IP and Destination TCP/UDP port numbers. • Source/Destination MAC, VLAN, EtherType, source module, and incoming port. • Source/Destination IP and Source/Destination TCP/UDP port numbers. • Enhanced hashing mode Enhanced 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 Layer-2 packets, Source and Destination MAC address plus physical source port are used for hash computation. For IP packets, Source IP, Destination IP address, TCP/UDP ports, and physical source port are used. • Non-Unicast traffic and Unicast traffic is hashed using a common hash algorithm. Link Aggregation 1043