Note: switching modes (CEF – fast switched – process switched)

If an inbound interface is configured for CEF, the packet will be switched with CEF, and CEF load balancing rules will apply: per destination (default) or per packet for IPv4, depending upon the configuration under the interface, and per destination for IPv6.

If CEF is NOT configured on the inbound interface, the outbound interface determines the switching mode, and thus the method of load sharing.

If an outbound interface is fast switched, per destination load sharing is performed.

If an interface is process switched, per packet load sharing is performed.