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QFX3500 Device Overview

 

The Juniper Networks QFX3500 device is a high-speed, multipurpose switch especially designed for next-generation data centers. The QFX3500 can be configured as a standalone switch, a Node device in a QFabric system, or as a member of a QFX Virtual Chassis.

Forty-eight 10-Gbps access ports in the device use small form-factor pluggable plus (SFP+) transceivers and operate by default as 10-Gigabit Ethernet interfaces. Optionally, you can choose to configure up to 12 of the ports as 2-Gbps, 4-Gbps, or 8-Gbps Fibre Channel (FC) interfaces, and up to 36 of the ports as 1-Gigabit Ethernet interfaces. When used as a standalone switch, four 40-Gbps uplink ports in the device use quad small form-factor pluggable plus (QSFP+) to four SFP+ copper breakout cables to support an additional 15 10-Gigabit Ethernet interfaces.

QFX3500 devices can function as a Fibre Channel over Ethernet (FCoE)-FC gateway or as an FCoE transit switch. FCoE is a method of supporting converged FC and Ethernet traffic on a data center bridging (DCB) network by encapsulating unmodified FC frames in Ethernet to transport the FC frames over the physical Ethernet network.

In a QFabric system, a QFX3500 device functions as a Node device, connected to a QFabric system through 40-Gbps uplink ports to a Juniper Networks QFX3008-I or QFX3600-I Interconnect device. Together, the QFX3500 Node devices and QFX3008-I or QFX3600-I Interconnect devices form a multistage, nonblocking switch fabric that provides a high-performance, low-latency, unified interconnect solution for next-generation data centers.

The QFX3500 Node devices and Interconnect devices are connected to Juniper Networks QFX3100 Director devices in an out-of-band management network through Juniper Networks EX4200 Ethernet Switches. The QFX3100 Director devices present the QFabric system devices as a single network entity, which enables simplified management of your data center using the Junos OS command-line interface (CLI).

In a QFX Virtual Chassis, the QFX3500 device can participate with other QFX3500 devices and QFX3600 devices in a ring topology with up to 10 members.

In a QFX5100 Virtual Chassis Fabric, the QFX3500 device can participate as a leaf device. Up to a total of 20 devices can participate in the QFX5100 Virtual Chassis Fabric.

Software

QFX Series devices use the Junos operating system (OS), which provides Layer 2 and Layer 3 switching, routing, and security services. Junos OS is installed on the QFX3500 device’s 8-gigabyte (GB) internal flash drive. The same Junos OS code base that runs on QFX3500 devices also runs on all Juniper Networks EX Series switches, and J Series, M Series, MX Series, and T Series routers.

For more information about which features are supported on QFX Series devices, see Feature Explorer.

When the QFX3500 device is operating as a standalone switch, you manage the switch using the Junos OS command-line interface (CLI), accessible through the console and out-of-band management ports on the device.

When a QFX Series device operates as part of a QFabric system, all the devices in the data center fabric are managed through the Administrator software installed on the QFX3100 Director devices. Each device in a QFabric system is interconnected in a single control plane and management network, using the redundant management ports on each device.

Hardware

The compact QFX3500 device is 1 rack unit (1 U) in size and designed to fit in industry-standard 19-inch rack-mount enclosures. See Figure 1 and Figure 2 and Chassis Physical Specifications for a QFX3500 Chassis.

Note

The standard mounting configuration for the QFX3500 device uses a two rail mounting system. The QFX3500-RB-ACRB device model uses a four rail mounting system for installations that need to recess the switch or need to mount the port (rear) end of the switch forward.

Figure 1: QFX3500 Device Front
QFX3500 Device
Front
Figure 2: QFX3500 Device Rear
QFX3500 Device Rear

The front panel of the QFX3500 chassis has an LCD panel that displays the device hostname and the number of active alarms. See Front Panel of a QFX3500 Device. The rear panel has 48 10-Gbps access ports and 4 40-Gbps uplink ports. See Rear Panel of a QFX3500 Device.

SFP+ Access Ports

The QFX3500 device has 48 access ports (0 through 47) that support small form-factor pluggable plus (SFP+) and small form-factor pluggable (SFP) transceivers, as well as SFP+ direct attach copper cables, also known as Twinax cables. See Determining Interface Support for the QFX3500 Device.

  • Up to 48 of the access ports can be used for SFP+ transceivers or SFP+ direct attach copper cables. You can use 10-Gigabit Ethernet SFP+ transceivers and SFP+ direct attach copper cables in any access port. You can use 2-Gbps, 4-Gbps, or 8-Gbps Fibre Channel SFP+ transceivers in ports 0 through 5 and ports 42 through 47.

    Note

    If you use Fibre Channel SFP+ transceivers in ports 0 through 5 or ports 42 through 47, you must configure the entire block of ports as Fibre Channel ports. For example, if you use a Fibre Channel SFP+ transceiver in any of the ports 0 through 5, then ports 0 through 5 must be configured as Fibre Channel ports. If you use a Fibre Channel SFP+ transceiver in any of the ports 42 through 47, then ports 42 through 47 must be configured as Fibre Channel ports. You then cannot use 10-Gigabit Ethernet SFP+ transceivers in these ports.

  • Up to 36 of the access ports can be used for SFP transceivers. Gigabit Ethernet SFP transceivers can be used in ports 6 through 41.

    Caution

    Do not place a copper transceiver in an access port directly above or below another copper transceiver. Internal damage to the access ports and device can occur. Because of this limitation, a maximum of 18 copper transceivers can be installed in ports 6 through 41. We recommend using only the top row of access ports for copper transceivers.

Figure 3 shows the location of the SFP+ access ports, including the ports that can be used with Fibre Channel SFP+ transceivers and Gigabit Ethernet SFP transceivers.

Figure 3: SFP+ Access Port Locations
SFP+ Access Port
Locations

QSFP+ Uplink Ports

The QFX3500 device has four uplink ports (Q0 through Q3) that support up to four QSFP+ transceivers, as well as QSFP+ DAC or DAC breakout cables. See Determining Interface Support for the QFX3500 Device.

When the QFX3500 device is used as part of a QFabric system, these uplink ports are used to connect the QFX3500 Node device to QFX3008-I or QFX3600-I Interconnect devices. See Connecting a QFX3500 Node Device to a QFX3008-I Interconnect Device or Connecting a QFX3500 Node Device to a QFX3600-I Interconnect Device.

When the QFX3500 device is used as a standalone switch, these uplink ports are configured by default as 15 10-Gigabit Ethernet interfaces. Another option for these ports is to configure one or more of the ports as 40-Gigabit Ethernet interfaces.

Note

Port Q0 is unique in that the number of 10-Gigabit Ethernet interfaces supported varies by Junos OS release. In some Junos OS releases, port 00 has a reserved port and in other releases the port is available. See the topics on Channelizing Interfaces or Configuring the Port Type, for your specific release.

Figure 4 shows the location of the QSFP+ uplink ports and the default 10-Gigabit Ethernet interface numbering.

Note

The QSFP+ uplink ports are not supported in Junos OS Release 11.1. The QSFP+ uplink ports are supported in Junos OS Release 11.2 and later. To configure the ports as 40-Gigabit Ethernet interfaces, you must be using Junos OS Release 12.2X50-D20 or later.

Figure 4: QSFP+ Uplink Port Locations
QSFP+ Uplink Port
Locations