LACP Overview

Link-Aggregation-Cisco

Link Aggregation Control Protocol (LACP)

Link aggregation is bundling two or more links as one logical link for increasing bandwidth and availability. This can be done by one of the two protocols . One of them is the Cisco proprietary PAgP and the other is standard based LACP. PAgP is the Port Aggregation Protocol. And the LACP is the Link Aggregation Control Protocol. These two protocols does not interoperate each other. You can use only one of them to configure link aggragation.

Here, we will focus to the standard based, LACP protocol.The last Cisco devices are already use LACP instead of PagP.

Link Aggregation on Cisco Devices, LACP, PAgP
 

Link Aggregation on Cisco Devices
To aggragete links to a single logical link, firstly we need more than two ports with the same characteristics such as data rate, duplex capability, etc.. The ports can be in different interfaces, this is not important.

There is also a limitation about ports in the bundle. In Cisco platforms the ports in a bundle is limited by 8ports . This can be change in some platforms. For example in Cisco 10000 series, only 4 port is supported in a bundle.

This bundle is called Link Aggregation(LAG) generally.

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Lesson tags: LAG, Link Aggregation, LACP
Back to: HCNA > Link Aggregation

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