Chapter 3 Link Aggregation Configuration; Overview; Introduction To Link Aggregation; Introduction To Lacp - H3C S9500 Series Operation Manual

Operation Manual – Port
H3C S9500 Series Routing Switches

Chapter 3 Link Aggregation Configuration

3.1 Overview

3.1.1 Introduction to Link Aggregation

Link aggregation means aggregating several ports together to implement the
outgoing/incoming payload balance among the member ports and enhance the
connection reliability. Link aggregation may be manual aggregation, dynamic LACP
aggregation or static LACP aggregation. For the member ports in an aggregation group,
their basic configurations must be the same. That is, if one is a trunk port, others must
also be; when it turns into access port, then others must change to access port.
Basic configuration includes STP setting, QoS setting, VLAN setting, and port setting.
The STP setting includes STP enabling/disabling, link attribute (point-to-point or not),
STP priority, path cost, max transmission speed, loop protection, root protection, edge
port or not. The QoS setting includes traffic limiting, priority marking, default 802.1p
priority, bandwidth assurance, congestion avoidance, traffic redirection, and traffic
statistics. The VLAN setting includes permitted VLAN types, default VLAN ID. The port
setting includes port link type.
One S9500 series routing switch can support up to 920 aggregation groups. IDs 1
though 31 indicate manual or static aggregation groups. IDs 32 through 64 are
reserved. IDs 65 though 192 are routed trunks; IDs 193 through 920 indicate dynamic
aggregation groups. The systems with MPLS VPN cards only support seven load
balancing aggregation groups; those without MPLS VPN cards support 31 load
balancing aggregation groups. The systems with FE boards using EX chips only
supports seven load balancing aggregation groups.
Note:
At present, S9500 series also support trans-board aggregation. The trans-board
aggregation is the same as the intra-board aggregation.

3.1.2 Introduction to LACP

Link aggregation control protocol (LACP) based on the IEEE802.3ad standard can be
used in dynamic link aggregation. An LACP-enabled port sends link aggregation
control protocol data units (LACPDUs) to tell the peer about its system priority, system
MAC address, port priority, port number and operation key. After receiving the
Chapter 3 Link Aggregation Configuration
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