See the 7210 SAS-Mxp, R6, R12, S, Sx, T Router Configuration Guide for more information about ECMP support for 7210 SAS platforms.
When a requirement exists to increase the available bandwidth for a logical link that exceeds the physical bandwidth or add redundancy for a physical link, typically one of the methods is applied; equal cost multi-path (ECMP) or LAG. A 7210 SAS can deploy both at the same time, meaning, using ECMP of two or more LAGs or single links.The Nokia implementation supports per flow hashing used to achieve uniform loadspreading and per service hashing designed to provide consistent per service forwarding. Depending on the type of traffic that needs to be distributed into an ECMP or a LAG, different variables are used as input to the hashing algorithm.
An option is provided per LAG to select the hashing function to be used for load-balancing flows on the member ports of the LAG. Users can use one of the available options based on the flows they have in their network and select an option that helps improve the load-balancing of flows in their network. The packets fields selected by the hashing function is different for some flows with the two hashing functions and is provided in the following tables.