Juniper QFX3000-G QFabric, Руководство по развертыванию, Страница: 45 / 652

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Director device —A single management device for the QFabric system. Director devices
with a hard drive provide full processing services and are used to build the Director
group.
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Director group —A set of Director devices. The Director group is essential to the QFabric
system, which cannot operate properly without it. The Director group shares and
load-balances processing tasks for the QFabric system, performs topology discovery,
assigns identifiers to QFabric system components, and manages interfabric
communication. The primary devices in a Director group are Director devices that
contain hard drives. The Director devices run dual processes in active or standby mode
for maximum redundancy.
When you add additional Director devices to the group, the Director group coordinates
their activities and distributes processing loads across all available Director devices.
The additional Director devices provide the Director group with additional memory and
processing power. Supplementing the Director group with extra Director devices allows
the group to scale efficiently and serve the needs of the entire QFabric system as it
grows.
Director Group Services
The Director group is a management platform that establishes, monitors, and maintains
all components in the QFabric system. It is a set of Director devices that run the Junos
operating system (Junos OS) on top of a CentOS foundation. The Director group handles
tasks such as QFabric system network topology discovery, Node and Interconnect device
configuration and startup, and Domain Name System (DNS), Dynamic Host Configuration
Protocol (DHCP), and Network File System (NFS) services. The Director group also runs
the software for management applications, hosts and load-balances internal processes
for the QFabric system, maintains configuration and topology databases, and starts
additional QFabric system processes as requested.
Another critical role provided by the Director group is the hosting of the virtual Junos
Routing Engines. These Routing Engines provide services for the QFabric system to keep
it operating smoothly.
Related
Documentation
Performing the QFabric System Initial Setup on a QFX3100 Director Group on page 362
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Understanding Routing Engines in the QFabric System on page 19
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Understanding the QFabric System Hardware Architecture on page 15
Understanding Routing Engines in the QFabric System
Supported Platforms QFabric System
19 Copyright © 2015, Juniper Networks, Inc.
Chapter 2: Hardware Architecture Overview