Introduction To Link Aggregation; Introduction To Lacp; Chapter 1 Link Aggregation Configuration - Huawei Quidway S3900 Series Operation Manual

Operation Manual – Link Aggregation
Quidway S3900 Series Ethernet Switches-Release 1510

Chapter 1 Link Aggregation Configuration

1.1 Overview

1.1.1 Introduction to Link Aggregation

Link aggregation means aggregating several ports together to form an aggregation
group, so as to implement outgoing/incoming load sharing among the member ports in
the group and to enhance the connection reliability.
Depending on different aggregation modes, aggregation groups fall into three types:
manual, static LACP, and dynamic LACP. Depending on whether or not load sharing is
implemented, aggregation groups can be load-sharing or non-load-sharing aggregation
groups.
For the member ports in an aggregation group, their basic configuration must be the
same. The basic configuration includes STP, QoS, VLAN, port attributes and other
associated settings.
STP configuration, including STP status (enabled or disabled), link attribute
(point-to-point or not), STP priority, maximum transmission speed, loop prevention
status, root protection status, edge port or not.
QoS configuration, including traffic limiting, priority marking, default 802.1p priority,
bandwidth assurance, congestion avoidance, traffic redirection, traffic statistics,
and so on.
VLAN configuration, including permitted VLANs, and default VLAN ID.
Port attribute configuration, including port rate, duplex mode, and link type (Trunk,
Hybrid or Access). The ports for a manual or static aggregation group must have
the same link type, and the ports for a dynamic aggregation group must have the
same rate, duplex mode and link type.
Note:
S3900 series Ethernet switches support cross-device link aggregation if IRF fabric is
enabled.

1.1.2 Introduction to LACP

The purpose of link aggregation control protocol (LACP) is to implement dynamic link
aggregation and deaggregation. This protocol is based on IEEE802.3ad and uses
LACPDUs (link aggregation control protocol data units) to interact with its peer.
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Chapter 1 Link Aggregation Configuration