Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Understanding Junos Fusion

Junos Fusion technology, based on the IEEE 802.1BR standard, is a rich, open framework that makes networks highly versatile, extensible, and responsive in multivendor environments. With Junos Fusion technology, network administrators can reduce network complexity and operational expenses by collapsing underlying network elements into a single, logical point of management using QFX Series and EX Series switches running the Junos operating system.

Junos Fusion consists of two major components—aggregation devices and satellite devices.

Aggregation devices serve as the core of a Junos Fusion fabric and are responsible for almost all management tasks, including interface configuration for every satellite device interface in the topology. An aggregation device runs Junos OS for the entire Junos Fusion. The network-facing interfaces on the satellite devices—extended ports—are configured from the aggregation device and support features that are supported on Junos OS running on the aggregation device. A Junos Fusion fabric can have one aggregation device (single-home Junos Fusion) or two aggregation devices (multihome or dual-home Junos Fusion).

Satellite devices form the access layer of a Junos Fusion fabric. These devices, which are connected through uplink ports to the aggregation devices, need not be individually managed as the control plane resides on the aggregation device.

Network Director supports Junos Fusion technologies — Junos Fusion Enterprise.

Table 1 lists the device models that are supported as aggregation and satellite devices for each Junos Fusion technology.

Table 1: Devices Supported in Junos Fusion

Junos Fusion Technology

Aggregation Device

Satellite Device

Junos Fusion Enterprise





Network Director provides a single pane of glass (SPOG) solution for managing Junos Fusion Enterprise fabrics, enabling network agility and reducing costs.

Setting up a Junos Fusion Enterprise using Network Director involves the following tasks:

  1. Create a configuration template for the instance (Junos Fusion Enterprise). In a configuration template, you specify details such as the fusion topology, ports to be used, software image to be used for satellite devices, and so on.

  2. Apply the template to one or more Junos Fusion systems. While applying a template, you select the aggregation devices, specify the software image to be used for the aggregation devices, the DHCP and file server details that Network Director uses to bring up the aggregation devices, and the ICL or ICCP port details for multi-home Junos Fusion.

    Network Director creates the Fusion solution based on the template that you applied, and displays the Fusion instance in the Manage Fusion Fabric page.