LACP provides two key features that afford redundancy for LACP EtherChannels. These two features are LACP hot-standby ports and LACP 1:1 redundancy with fast switchover.
LACP Hot-Standby Ports
By default, when LACP is configured on ports, it tries to configure the maximum number of compatible ports in a port channel, up to the maximum allowed by the hardware, which is typically eight ports.
However, if LACP is unable to aggregate all the ports that are compatible into an EtherChannel (e.g. if the neighboring switch has hardware limitations and can only support a fewer number of ports . . .
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