Chapter 21 Configuring Qos For 802.3Ad Link Aggregation Groups; Qos For 802.3Ad Link Aggregation Interfaces Overview; Types Of Load Balancing - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

Chapter 21
Configuring QoS for 802.3ad Link
Aggregation Groups

QoS for 802.3ad Link Aggregation Interfaces Overview

Types of Load Balancing

This chapter provides information for configuring QoS for 802.3ad link aggregation
groups.
QoS topics are discussed in the following sections:
QoS for 802.3ad Link Aggregation Interfaces Overview on page 183
Hashed Load Balancing for 802.3ad Link Aggregation Groups
Overview on page 186
Subscriber Load Balancing for 802.3ad Link Aggregation Groups
Overview on page 186
Guidelines for Configuring QoS over 802.3ad Link Aggregation Groups on page 190
Configuring the Scheduler Hierarchy for Hashed Load Balancing in 802.3ad Link
Aggregation Groups on page 191
Enabling Default Subscriber Load Balancing for 802.3ad Link Aggregation
Groups on page 191
Configuring the Scheduler Hierarchy for Subscriber Load Balancing in 802.3ad
Link Aggregation Groups on page 192
Configuring Load Rebalancing for 802.3ad Link Aggregation Groups on page 193
Monitoring QoS Configurations for 802.3ad Link Aggregation Groups on page 195
You can configure QoS for 802.3ad link aggregation interfaces. To ensure that QoS
is applied properly to the interface column, you configure the QoS profile using either
a hashed loadbalancing scheme or a subscriber loadbalancing scheme.
For hashed load balancing, you configure the scheduler hierarchy with Ethernet
queues, and the system replicates them on each link within the link aggregation
group (LAG). The system demultiplexes each packet to one of the active links in the
LAG using a random hash generated by fields in the packet header. For example,
when an IP packet is routed to a LAG, the hash algorithm is based on the IP Source
Address and Destination Address in the IP header.
QoS for 802.3ad Link Aggregation Interfaces Overview
183