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Node groups help you combine multiple Node devices into a single virtual entity within
the QFabric system to enable redundancy and scalability at the edge of the data center.
This topic covers:
•
Network Node Groups on page 28
•
Server Node Groups on page 28
Network Node Groups
A set of one or more Node devices that connect to an external network is called a network
Node group . The network Node group also relies on two external Routing Engines running
on the Director group. These redundant network Node group Routing Engines run the
routing protocols required to support the connections from the network Node group to
external networks.
When configured, the Node devices within a network Node group and the network Node
group Routing Engines work together in tandem as a single entity. By default, network
Node group Routing Engines are part of the
NW-NG-0 network Node group but no Node
devices are included in the group. As a result, you must configure Node devices to be part
of a network Node group.
In a QFabric system deployment that requires connectivity to external networks, you can
modify the automatically generated network Node group by including its preset name
NW-NG-0
in the Node group configuration. Within a network Node group, you can include
a minimum of one Node device up to a maximum of eight Node devices. By adding more
Node devices to the group, you provide enhanced scalability and redundancy for your
network Node group.
NOTE: The QFabric system creates a single NW-NG-0 network Node group
for the default partition. You cannot configure a second network Node group
inside the default partition. The remaining Node devices within the default
partition are reserved to connect to servers, storage, or other endpoints
internal to the QFabric system. These Node devices either can be retained in
the automatically generated server Node groups or can be configured as part
of a redundant server Node group.
Server Node Groups
A server Node group is a set of one or more Node devices that connect to servers or storage
devices. Unlike Node devices that are part of a network Node group and rely on an external
Routing Engine, a Node device within a server Node group connects directly to endpoints
and implements the Routing Engine functions locally, using the local CPU built into the
Node device itself.
By default, each Node device is placed in its own self-named autogenerated server Node
group to connect to servers and storage. You can override the default assignment by
manually configuring a redundant server Node group that contains a maximum of two
Node devices. You can use a redundant server Node group to provide multihoming services
Copyright © 2015, Juniper Networks, Inc. 28
QFX3000-G QFabric System Deployment Guide