Tag :: Hashing

In older EOS releases the ingress interface was always included in LAG hash calculations input together with other

Introduced in EOS-4.20.1F, “selectable hashing fields” feature controls whether a certain header’s field is used in the hash calculation for LAG and ECMP.

Arista switches use the hashing algorithm to load balance traffic among LAG (Link Aggregation Group) members

Link Aggregation Group (LAG) or port channel interfaces comprise multiple member interfaces. Network devices typically distribute packets across the member interfaces using a hash computed from packet header fields. The Round-Robin LAG Distribution feature introduces a new packet distribution method: the round-robin method. A round-robin LAG configuration balances packets evenly across all member interfaces in a sequential, round-robin fashion.

This feature extends the existing UDP payload hashing support to allow an alternative set of bytes to be used in the calculation of the LAG and ECMP hash if an 16 bit field of the payload matches a provided pattern.