EtherChannel protocol allows ports with similar characteristics to form a Bundle through dynamic negotiation(LACP and PAgP) or Forceful enforcement (ON) with connected network devices.
While configuring EtherChannel across devices (Switches/Routers), 2 most widely used negotiation protocols are PAgP and LACP. While PAgP is Cisco proprietary, LACP is Open standard and supported by most of the vendors.
Related – EtherChannel Modes
In order to configure EtherChannel through PAgP, Auto and Desirable are the keywords used while LACP uses Active and Passive modes.
Related – LACP Beginners Guide
In fact, the multicast address used by both Negotiation modes are dissimilar – PAgP uses “01-00-0C-CC-CC-CC” and LACP uses “01-80-c2-00-00-02”
Difference between PAGP and LACP
A detailed comparison between both PAGP vs LACP is enlisted in the below table –
|Abbreviation for||Port Aggregation Protocol||Link Aggregation Control Protocol
|Standard||Cisco Proprietary||Open Standard (IEEE 802.3ad)
|Configuration Modes||* Auto|
|Supported by||Etherchannel ||Etherchannel and 802.3ad
|Year of Introduction||Invented in the early 1990s||IEEE passed 802.3ad (LACP) In year 2000
|Configuration||Switch(config-if)#channel-group 1 mode ||Switch(config-if)#channel-group 1 mode
Download the difference table here.