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Port Panel of QFX5100-48S and QFX5100-48SH Devices

The port panel of the QFX5100-48S and QFX5100-48SH switches supports up to a maximum of 72 logical 10 GbE ports when operating as a standalone switch. Forty-eight physical ports(0 through 47) support 10 Gigabit Ethernet small form-factor pluggable plus (SFP+) transceivers. These ports can also support 1 Gigabit SFP transceivers and can be configured at either 1 Gbps or 1 Gbps speeds using the set interface speed command. All 48 of these ports can be used for SFP+ transceivers or SFP+ direct attach copper (DAC) cables. You can use 1-Gigabit Ethernet SFP+, 10-Gigabit Ethernet SFP+ transceivers and SFP+ DAC cables in any access port.

The remaining 24 logical ports are the six 40 GbE physical ports (48 through 53) that support up to 6 quad small-form factor pluggable plus (QSFP+) transceivers . Each QSFP+ socket can operate either as a single 40 Gbps port or as a set of 4 independent 10 Gbps ports using QSFP+ breakout cables. The 40 GbE ports can be configured as either access ports or as uplinks.


Do not install 1GbE copper transceivers (such as QFX-SFP-1GE-T) directly above or below another 1GbE copper transceiver. Use only the top row or bottom row to avoid damage to the device caused by some types of copper transceivers when the transceivers are installed above or below each other. However, if you are using copper transceivers with the OEM part number FCLF8521P2BTL-J1 printed on the transceiver label, you can install the transceivers in any port with no restrictions. For devices that support 10GbE copper transceivers, there is no similar restriction.

To connect a QFX5100-48S switch as a node device in a QFabric system, you need:

  • Four QSFP+ uplink ports on each QFX5100-48S Node device to connect to the data plane network through the QFX3008-I or QFX5100-24Q Interconnect devices.

  • The two remaining QSFP+ uplink ports on each QFX5100-48S Node device connect to the data plane network through the QFX3008-I or QFX5100-24Q Interconnect devices. See Determining Interface Support for the QFX5100 Device.

To connect a QFX5100-48S switch as a member in a QFX Virtual Chassis, you need a pair of dedicated ports and cables that link each member in the Virtual Chassis into a ring topology. Each member in the ring has at least one direct Virtual Chassis port (VCP) connection to a upstream and downstream member. QFX5100-48S switches are recommended in the primary, backup, or line card role. When mixed with QFX3500 or QFX3600 devices, configure the QFX5100-48S in the primary and backup roles. See Connecting QFX Series and EX Series Switches in a QFX Virtual Chassis for cabling diagrams.

To connect a QFX5100-48S switch as a spine or leaf device in a QFX5100 Virtual Chassis Fabric (VCF), you need a pair of dedicated ports and cables that link each spine device and leaf device in the VCF. All spine devices have at least one direct VCP connection to each leaf device in the VCF. See Connecting a QFX5100 Device in a Virtual Chassis Fabric for a cabling diagram.

Best Practice:

In a mixed QFX5100 VCF environment with multiple models of QFX5100 and the EX4300, use QFX5100-24Q as spine devices. In the maximum configuration of 20 total devices, up to four QFX5100-24Q devices may be used as spine devices. All members can be connected to the spine using QSFP+ ports. You can configure the QFX5100-96S as a spine in an all QFX5100-96S VCF or in a mixed VCF comprised of EX4300 and QFX5100-96S.

As of Junos OS release 17.3R1, you can also connect a QFX5100-48S as a leaf device in a QFX5110 VCF or as a member in a QFX5110 Virtual Chassis.

Figure 1 shows the port panel of a QFX5100-48S switch.

Figure 1: QFX5100-48S Switch Port PanelQFX5100-48S Switch Port Panel
Electrostatic Discharge (ESD) terminal
40 GbE ports (6)
10 G ports (48)

The QFX5100-48S and QFX5100-48SH device ports, (0 through 47) support:

  • SFP transceivers that can run at either 100 Mbps or 1 Gbps speed

  • SFP+ transceivers at 10 Gbps speed

  • SFP to SFP direct attach copper (DAC) cables

  • SFP+ to SFP+ DAC cables

  • SFP+ to SFP+ active optical cables (AOC)

The QFX5100-48S and QFX5100-48SH 40 G uplink or data ports (48 through 53) support:

  • QSFP+ transceivers

  • QSFP+ to QSFP+ direct attach copper (DAC) cables

  • QSFP+ to SFP+ DAC breakout cables (DACBO)

  • QSFP+ to QSFP+ active optical cables (AOC)

  • QSFP+ to SFP+ AOC breakout cables (AOCBO)