Introduction To Link Aggregation; Introduction To Lacp; Chapter 1 Link Aggregation Configuration - H3C S5100-SI Series Operation Manual

Operation Manual – Link Aggregation
H3C S5100-SI/EI Series Ethernet Switches

Chapter 1 Link Aggregation Configuration

When configuring link aggregation, go to these sections for information you are
interested in:
Overview
Link Aggregation Classification
Aggregation Group Categories
Link Aggregation Configuration
Displaying and Maintaining Link Aggregation Configuration
Link Aggregation Configuration Example
1.1 Overview

1.1.1 Introduction to Link Aggregation

Link aggregation aggregates multiple physical Ethernet ports into one logical link, also
called an aggregation group.
It allows you to increase bandwidth by distributing traffic across the member ports in the
aggregation group. In addition, it provides reliable connectivity because these member
ports can dynamically back up each other.

1.1.2 Introduction to LACP

The Link Aggregation Control Protocol (LACP) is defined in IEEE 802.3ad. It uses link
aggregation control protocol data units (LACPDUs) for information exchange between
LACP-enabled devices.
With LACP enabled on a port, LACP notifies the following information of the port to its
peer by sending LACPDUs: priority and MAC address of this system, priority, number
and operation key of the port. Upon receiving the information, the peer compares the
information with the information of other ports on the peer device to determine the ports
that can be aggregated. In this way, the two parties can reach an agreement in
adding/removing the port to/from a dynamic aggregation group.
When aggregating ports, link aggregation control automatically assigns each port an
operational key based on the port speed, duplex mode, and basic configurations
described in
In a manual or static link aggregation group, the selected ports are assigned the same
operational key. In a dynamic link aggregation group, all member ports are assigned
the same operational key.
Consistency Considerations for the Ports in
Chapter 1 Link Aggregation Configuration
1-1
Aggregation.