Port Aggregation Protocol (PAgP) is a Cisco proprietary protocol used for automated logical aggregation of Ethernet switch ports. PAgP has two modes
this mode sets the interface to actively attempt to negotiate a PAgP connection.
Link Aggregation Control Protocol (LACP) is a part of IEEE specification 802.3ad that allows you to bundle several physical ports to form a single logical channel.
this mode sets the interface to actively attempt to negotiate connections with other LACP devices.
this mode sets the interface to respond to LACP data if it receives negotiation requests from other systems.
Forces the connection to bring all links up without using a protocol to negotiate connections. This mode can only connect to another device that is also set to on. When using this mode, the switch does not negotiate the link using either PAgP or LACP.