Ether-Channel

PAgP

LACP

A single switch is in charge of selecting which Standby link will be promoted to the active state—it is the switch with the lower LACP System ID that consists of a configurable priority and the switch MAC address (the same concept as in STP). If there are multiple Standby links, the switch in control will choose the link with the lowest Port ID that again consists of a configurable priority and the port number. LACP priority of a switch can be globally configured using the lacp system-priority command, and the priority of a port can be set up using the lacp port-priority command. Both priorities can be configured in the range of 0–65535.