EtherChannel is utilized to package actual connections into a solitary sensible connection. We can package limit of 8 actual connections into one legitimate connection. Whenever actual connections packaged into a solitary coherent connection, the STP just sees a solitary legitimate connection and can’t impede anything.

There are two sorts of convention utilized for EtherChannel, Port Aggregation Protocol (PAgP) and Link Aggregation Control Protocol (LACP). EtherChannel conventions eliminate any circles inside the actual connections.

The Etherchannel conventions additionally keep a record of each actual connection. In the event of any actual connection disappointment or rebuilding, the conventions deal with the erasure and expansion of the connection without illuminating the STP about the change. Cisco switch utilizes the IEEE standard Link Aggregation Control Protocol (LACP) and Cisco exclusive Port Aggregation Protocol.

Each EtherChannel is known as a channel bunch. We can add an actual port into the gathering utilizing the “channel bunch number mode on” order in the point of interaction arrangement mode. We can likewise make and design the EtherChannel without the utilization of PAgP or LACP. This kind of EtherChannel is known as a static or Unconditional EtherChannel.

Port Aggregation Protocol (PAgP)

Port Aggregation Protocol is a Cisco-restrictive convention that can work on Cisco switches or on switches authorized by merchants to help Port Aggregation Protocol. The convention helps the programmed formation of Etherchannel utilizing the trading of PAGP bundles.

Port Aggregation Protocol bundles are traded between EtherChannel-skilled ports to arrange the foundation of a channel. Port Aggregation Protocol additionally checks for setup solidness and oversees interface options and disappointments between two switches. It guarantees that when an EtherChannel is made, all ports have a similar sort of design.

PAGP parcels contain all the data of the neighbor switch. The getting switch learns the neighbor switch personality capacity of supporting PAGP and afterward powerfully bunches also arranged ports into a solitary coherent connection. At the point when PAgP is empowered, the PAgP parcels are sent after at regular intervals. The Port-Aggregation Protocol (PAgP) utilizes the layer 2 multicast address 01-00-0C-CC-CC-CC.

For laying out EtherChannel, all ports should have similar information speed, duplex setting, and VLAN data. Any alteration on the port design can cause changes on any remaining ports of the channel. The figure shows the modes for Port Aggregation Protocol.

On-Interfaces arranged with this mode don’t trade PAgP parcels. On mode power the connection point to channel without PAgP or LACP. Port with “on” mode, will be made EtherChannel just when another connection point bunch in EtherChannel “on” mode.

PAgP alluring Interface with PAgP beneficial mode stay in a functioning arranging state in which the point of interaction starts arrangements with different points of interaction by sending PAgP bundles after like clockwork.

PAgP auto-Interface with PAgP auto mode puts the connection point in an aloof arranging state in which the connection point answer to the PAgP bundles got, however doesn’t start any Port Aggregation Protocolnegotiation.

For laying out EtherChannel the modes similarity on both side is significant. For instance, in the event that one side is arranged to be in auto mode, trusting that the opposite side will start the EtherChannel exchange.

Assuming the opposite side is additionally set to auto, the PAgP bundle won’t ever trade and the EtherChannel doesn’t frame. On the off chance that all modes are debilitated, or on the other hand assuming no mode is designed, the EtherChannel is handicapped. The figure underneath shows the method of the Port Aggregation Protocol for EtherChannel foundation.

The on mode physically set the connection point in an EtherChannel, with next to no arrangement. In the event that one side is set to on the opposite side should be set to for laying out EtherChannel. Assuming the opposite side is set to arrange boundaries through Port Aggregation Protocol, the EtherChannel is absurd, in light of the fact that the side that is set to on mode doesn’t arrange. The Etherchannel setup for the above geography is as under:

Note:- PAgP Modes are: On, Desirable, Auto


Switch1(config)#interface territory e0/0-3

Switch1(config-if-range)#channel-bunch 1 mode auto

Switch1(config-if-range)#interface port-channel 1

Switch1(config-if)#switchport mode trunk


Switch2(config)#interface territory e0/0-3

Switch2(config-if-range)#channel-bunch 1 mode attractive

Switch2(config-if-range)#interface port-channel 1

Switch2(config-if)#switchport mode trunk

The Port Aggregation Protocol does a setup beware of taking part interfaces and affirms that the adjoining connection points are additionally utilizing Port Aggregation Protocol. In the Port Aggregation Protocol interfaces that don’t have comparative designs won’t partake, and we will not get an unplanned exchanging circle.


LACP is an open convention, distributed by IEEE under the 802.3ad determination. The IEEE likewise discharge another meaning of the LACP in IEEE 802.1AX norm for neighborhood and metropolitan region organizations. LACP, comparably permits a few actual ports to be packaged to lay out a solitary legitimate channel.

It permits a change to arrange a programmed group utilizing the LACP parcels. The capacity of the LACP is like PAgP with Cisco EtherChannel. The thing that matters is that LACP is an IEEE standard and PAgP is Cisco Propiaritry. The LACP is utilized to lay out EtherChannels in multivendor conditions. On Cisco gadgets, we can utilize the two conventions. The LACP utilizes multicast address 01-80-c2-00-00-02.

LACP is something very similar in the working and demonstrated a similar arrangement benefits as PAgP. It lays out the EtherChannel interface by recognizing the arrangement of each side and really look at the similarity. The figure shows the various modes for LACP.

On-comparably the on mode guarantee the point of interaction to channel without LACP. Connects with this mode don’t trade LACP parcels.

LACP dynamic The dynamic mode puts a port in a functioning arranging state. The port beginnings arrangements with different ports by sending LACP parcels.

LACP uninvolved The latent mode puts a port in a detached arranging state. In the uninvolved mode, the port reacts to the LACP parcels that it gets, but the detached port doesn’t start LACP bundle exchange.

Like PAgP, modes should be viable on the two sides for laying out EtherChannel. The on mode is rehashed on the grounds that it makes the unqualified EtherChannel arrangement without PAgP or LACP dynamic exchange. The straightforward setup of LACP for the above geography is as under: The arrangement of LACP is practically same to PAgP setup. The thing that matters is just the utilization of the catchphrase. The catchphrases utilized by LACP is dynamic and aloof. The dynamic catchphrase shows that the point of interaction utilizes LACP convention. The inactive catchphrase shows the utilization of LACP, nonetheless, it can react to asks for yet can’t send any LACP parcel.