This document discusses link aggregation and the Link Aggregation Control Protocol (LACP). It defines a Link Aggregation Group (LAG) as a group of links that appear as a single link to devices. LACP negotiates the automatic bundling of links using LACPDUs and allows for various load balancing modes and hot standby ports. LACP maintains configuration information, exchanges it with peer devices, and attaches or detaches ports from the LAG based on the configuration. It can operate in active or passive mode.

1. LINK AGGREGATION AND
LACP

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LINK AGGREGATION GROUP (LAG)
Link Aggregation Group - group of links that appear to a MAC Client
as if they were a single link.

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Three links are aggregated in
one group, traffic transfer is
possible
Three links are aggregated in one
group, one link is down, traffic
transfer is still possible
One link used, traffic transfer is
possible
One link used, one link is down,
traffic transfer is not possible
anymore
LAG ADVANTAGES
LAG provides high reliability, redundancy and increase throughput. If a
port fails, traffic continues on the remaining ports.

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DYNAMIC LAG - LINK AGGREGATION CONTROL PROTOCOL (LACP)
Peculiarities:
 Negotiates automatic bundling of links using LACPDUs
 Option of balancing mode
 Various balancing modes
 Option of configuring hot standby ports

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LACP FUNCTIONS
LACP performs the following functions in the system:
 Maintains configuration information to control aggregation.
 Exchanges configuration information with other peer devices.
 Attaches or detaches ports from the LAG based on the
exchanged configuration information.

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LACP MODES
LACP can be configured in the following modes:
 Active - In this mode, the ports send LACP packets at regular
intervals to the partner ports.
 Passive - In this mode, the ports do not send LACP packets until
the partner port sends LACP packets. After receiving the
LACP packets from the partner port, the ports send LACP
packets to the partner port.

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HASHMODE
Without hashing
Hashing algorithm used for distributing traffic between member link
in a link aggregation group (LAG).
With hashing

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