what is pagp
From Wikipedia, the free encyclopedia. Port Aggregation Protocol (PAgP) is a Cisco Systems proprietary networking protocol, which is used for the automated, logical aggregation of Ethernet switch ports, known as an etherchannel. This means it can only be used between Cisco switches and/or switches from licensed vendors.A similar purpose protocol known as LACP, released by the IEEE known as 802.3ad, is an industry standard and is not tied to any specific vendor. PAgP can be configured on a Cisco switch to operate in three different modes.1  auto-passive negotiation of the channel. 2  desirable-active negotiation of the channel. similar purpose protocol known as LACP, released by the IEEE known as 802.3ad, is an industry standard and is not tied to any specific vendor. PAgP can be configured on a Cisco switch to operate in three different modes.