A link aggregation group (LAG) increases the uplink bandwidth proportional to the number of member interfaces. Another advantage of link aggregation is increased availability, because the LAG is composed of multiple member links. If one member link fails, the LAG continues to carry traffic over the remaining links. In order to effectively increase the bandwidth of the LAG, traffic needs to be balanced across the member links. The balancing is done by the LAG hashing algorithm, which is designed to have the member links used increasingly equally as the traffic profile gets more diverse. The LAG hashing algorithm on EX Series Switches determines the member link to be used for an incoming frame/packet depending on a subset of the below values in the frame/packet header: Source MAC address Destination MAC address Source IP address Destination IP address Source Port Destination Port IPv6 Flow Label MPLS Label(s) The hashing algorithm also takes into account the type of the frame/packet in
http://www.ebrahma.com/2013/08/juniper-ex-series-understanding-hashing-algorithm-for-link-aggregation/Labels: eBrahma