What are the types of Etherchannel and what are their modes?

PAgP

Port Aggregation Protocol (PAgP) is a Cisco proprietary protocol used for automated logical aggregation of Ethernet switch ports. PAgP has two modes

  • Auto
this mode sets the interface to respond to PAgP negotiation packets, but the interface will start negotiations on its own.
  • Desirable

this mode sets the interface to actively attempt to negotiate a PAgP connection.

LACP

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.

  • Active

this mode sets the interface to actively attempt to negotiate connections with other LACP devices.

  • Passive

this mode sets the interface to respond to LACP data if it receives negotiation requests from other systems.

ON mode 

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.

 


For CCNA data center preparation i found the perfect book CCNA Data Center by Wandell Odom on Amazon.in & Amazon.com