Difference Between Cisco LAG And LACP (With Table)

In the 1980s, Ethernet was developed to connect local devices in a region. It was called the Local Area Network. The purpose was to transmit and receive data from different people in the area. By connecting Ethernet devices using Ethernet switches, we can now connect over a larger Ethernet network. Link aggregation is a common terminology that can describe bridging well.

Cisco LAG vs LACP

The main difference between Cisco LAG and LACP is that Cisco LAG is an instance for link aggregation, while LACP is the action that creates an instance of link aggregation. If we look at LAG as a process, LACP is the protocol that governs the process.

Cisco LAG is the combination of two devices with more than one link. With Link Aggregation Group, we can combine multiple network interfaces into a single intellectual interface that increases the speed of the network. In addition to LAG, it is also known as Ethernet bonding, as it groups Ethernet links between two ethernet devices.

LACP is the monitoring unit that controls the operation of the LAG. Link Aggregation Control Protocol justifies its name being the protocol that allows LAG to function on its own. On the other hand, we can create a static link aggregation group without implementing any link aggregation control policy. Optionally, we can use LACP to protect the connection.

Comparison Table Between Cisco LAG and LACP

Parameters of comparison Cisco LAGLACP
Known as Link Aggregation Group.Link Aggregation Control Protocol.
Definition Cisco lag is a technique.LACP is a protocol that controls the technique.
Purpose Clubs multiple ports between two ethernet devices.Monitors the function of LAG.
Static mode LAG is required.During static mode, LACP is not required.
Dependency LAG can operate without LACP, that is it is independent. Dependent, i.e it is a protocol and you need some technique (like LAG) that you can use to start your control.

What is Cisco LAG?

Cisco LAG or Link Aggregation Group combines numerous interfaces into one main interface. LAG is also known as Ethernet bonding, link pooling, network interface controller bonding, port aggregation. The interfaces or ports are connected in parallel between the Ethernet switches. 

You can connect two switches or a huge network or multiple ports, a server. Network devices see the LAG or a combination of multiple links as a single link. LAG can be inserted into VLAN. in addition, multiple LAGs can be formed on a specific switch. You can also add more Ethernet ports to the specified LAG. The capability of the device decides the number of links that can be attached or grouped.

There are a few perks of link aggregation and they are as follows

  • Link aggregation is inexpensive. We can improve connectivity by increasing bandwidth, whereas it would have cost a lot if we had to install new cable runs.
  • Link aggregation allows for the expansion of bandwidth that serves as a single link but is actually an aggregation of numerous links.
  • Link aggregation balances the traffic load by dividing it among the physical links.
  • If one link is lost or broken, the other will not be broken. Networking is not delayed and the damage can be repaired until then.

What is LACP?

In the 1980s, Ethernet was developed to connect local devices in a region. It was called the Local Area Network. The purpose was to transmit and receive data from different people in the area. By connecting Ethernet devices using Ethernet switches, we can now connect over a larger Ethernet network. Link aggregation is a common terminology that can describe bridging well. 

LACP needs to be supported on both devices in order to implement its service. LACP converts a static link aggregation group to a dynamic link aggregation group. On the other hand, you can establish a non-dynamic configuration without linking LACP into your link aggregation group. When laying the connections it should be noted that the connections should have a similar resistance. For example, if one link is 100 Mbit / s, the other must also be 100 Mbit / s, otherwise, the LACP would indicate this as a bad configuration. The links should be either full-duplex or half-duplex otherwise it would not support the configuration of the link aggregation group. Dynamic-link aggregation is appreciated over a static link aggregation because LAG can not detect faulty configuration on its own, it needs a link aggregation control protocol to detect it. It is also economical.

Main Differences Between Cisco LAG and LACP

  1. LAG is known as Link Aggregation Group and LACP is known as Link Aggregation Control Protocol.
  2. Cisco LAG is the combination of two devices with more than one link whereas LACP is the monitoring unit that controls the operation of the LAG.
  3. The purpose of LAG is to club multiple ports between two ethernet devices while the purpose of LACP is to Monitors the function of LAG.
  4. Cisco LAG can exist without LACP and then it is known as the static configuration of LAG.
  5.  LAG isn’t always depending on LACP while LACP is depending on LAG.

Conclusion

The key difference between Cisco LAG and LACP is that Cisco LAG is the link aggregation instance, whereas LACP is the action that monitors the link aggregation instance. If we think of LAG as a process, LACP is the protocol that governs the process. Cisco LAG is a combination of two devices with more than one link. With Link Aggregation Groups, we can combine multiple network interfaces into one intellectual interface which increases network speed. Apart from LAG, it is also known as Ethernet bonding, because it groups an Ethernet link between two Ethernet devices. LACP is the monitoring unit that controls the operation of the LAG. The Link Aggregation Control Protocol justifies its name by being the protocol that instantiates LAG by itself. On the other hand, we can create static link aggregation groups without applying any link aggregation control policies. Optionally, we can use LACP to secure a connection and enhance availability.

References

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