What LACP does
Link Aggregation Control Protocol (IEEE 802.3ad/802.1AX) bundles several physical ports into one logical interface. Your router and the fabric treat the bundle as a single link.
Capacity
Two 10G ports in a bundle provide up to 20G of aggregate capacity. Note that any single flow uses only one member, so a single very large flow cannot exceed one port’s speed.
Resilience
If one member fails, traffic shifts to the remaining members and the logical link stays up.
Hashing considerations
Traffic is distributed across members based on a hash of addresses and ports. With many flows, distribution is fairly even; with a few large flows, it can be uneven.
Minimum links
Configure a minimum number of active members so the bundle goes down rather than becoming badly oversubscribed if several members fail.
When to move to a bigger port
Once you need four or more members, a single faster port is often simpler and more efficient.
