What is EtherChannel PAgP and LACP Modes

Port Aggregation protocol: PAgP was marketed under or related to cisco systems It helps more than anything else in creating automation of EtherChannel links, port aggregation protocol packets exchange between EthernetChannel ports, in order to form or establish the connection between the EthernetChannel. Intentionally we have some restrictions introduced in port aggregation protocol. PAgP bundles all ports when it belongs to the same virtual local area network or desired trunk ports and it doesn’t accept which are configured on dynamic virtual local area network.

If it gets already bundled and the modification arises that replicates to all ports in the bundle to make virtual lan same. For example, we need to change the speed and duplex to the port that makes a change on all ports in the bundle. EthernetChannel can be configured statically or unconditionally without the aid of Lacp or PAgP.

We have three modes in Port Aggregation Protocol:

  1. On: channel can be created without negotiation which means no PAgP packets are transferred between them to create a channel establishment
  2. Desirable: This mode asks the other switch that can you involve in Which means the interface will be in the state of active negotiating (initiates) i.e., sends PAgP packets to the interface to establish the channel
  3. Auto: Auto mode waits at the end to accepts the packets for channel creation but Auto mode never initiates sending packets to other switches.

Link aggregation control protocol: LACP belongs to the IEEE standard, technically explains as 802.3 ads but newly it was explained as 802.1AX for the purpose of LAN and MAN.  The functioning of Link aggregation protocol is similar to port aggregation protocol along with EthernetChannel because it applies to multiple owner environments and it works on cisco devices as well. One of the benefits in LACP is if the present working active link fails the standby or disaster recovery link will come into active.

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We have three modes in Link aggregation control protocol:

  1. On: channel can be created without negotiation which means no LACP packets are transferred between them to create a channel establishment.
  2. Active: Active mode asks the other switch that can you involve in Which means the interface will be in the state of active negotiating (initiates) i.e., sends LACP packets to the interface to establish the channel
  3. Passive: passive mode waits at the end to accepts the packets for channel creation but passive mode never initiates sending packets to other switches.

The on mode is the same for the two protocols because the EthernetChannel configuration can be done statically or unconditionally. So, it can be done without dynamic negotiation.


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