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QFX5140 Ports and Interfaces

This topic describes the ports on the QFX5140 and their corresponding Junos OS Evolved interfaces.

Network Ports on the QFX5140

QFX5140 provides 24 QSFP112 ports and 8 OSFP800 ports on the front panel, supporting speeds from 100G to 800G.
  • Total switching capacity: 16 Tbps

  • QSFP112 ports: 100G, 200G, 400G, breakout options (2×50G, 4×50G, 4×100G, 2×200G, 25G with QSA28 adapter).

  • OSFP800 ports: 100G, 400G, 800G, breakout options (2×400G, 8×100G, 4×200G).

  • Two SFP28 ports support 10G and 25G.

Table 1 summarizes the port speed capability of QFX5140.

Table 1: QFX5140 Network Ports
Form Factor Port Count Port Number Range Supported Speeds
QSFP112 24 0–23 100G, 200G, 400G, breakout modes
OSFP800 8 24–31 100G, 400G, 800G, breakout modes
SFP28 2 32–33 10G, 25G

See the Port Checker Tool for information on port combinations, port speeds, and channelizations supported on the QFX5140.

See the Hardware Compatibility Tool for a list of all supported optics for the QFX5140.

Channelization (Port Breakout)

QFX5140 supports flexible channelization, allowing a single physical port to operate as multiple independent logical interfaces. This capability maximizes port density and enables fine-grained bandwidth allocation.

Channelization is performed by splitting the electrical lanes of a port into independent logical channels.

QSFP112 Channelization

Each QSFP112 port supports up to 4 logical channels, depending on configuration.

Table 2: QSFP112 Channelization Modes
Mode Logical Interfaces Lanes per Interface Typical Use Case
1 × 400G 1 4 Spine uplink / high-bandwidth link
2 × 200G 2 2 Balanced aggregation
4 × 100G 4 1 Server-facing or high-density deployments
4 × 50G / 2 × 50G Up to 4 Fractional lanes Sub-rate operation
1 × 25G (QSA28) 1 Adapted Legacy compatibility
Behavior
  • All channels share a single transceiver module
  • Each channel appears as an independent interface
  • Breakout requires supported optics or fan-out cables
  • Lane-to-interface mapping is fixed by hardware design

OSFP800 Channelization

Each OSFP800 port supports up to 8 logical channels, offering higher density and flexibility.

Table 3: OSFP800 Channelization Modes
Mode Logical Interfaces Lanes per Interface Typical Use Case
1 × 800G 1 8 Core spine / ultra-high bandwidth
2 × 400G 2 4 Spine aggregation
4 × 200G 4 2 Scalable aggregation
8 × 100G 8 1 High-density breakout to leaf/servers
Behavior
  • Supports high-bandwidth optics including ZR/ZR+
  • Suitable for data center interconnect (DCI)
  • All breakout channels operate independently
  • Higher power and thermal requirements compared to QSFP112
Table 4: Channelization Overview
Port Type Total Lanes Maximum Channels Supported Breakouts
QSFP112 4 4 4×100G, 2×200G
OSFP800 8 8 8×100G, 4×200G, 2×400G

Interface Naming on the QFX5140

The ports on the QFX5140 have interfaces associated with them in QFX5140. These interfaces follow the naming convention described below:

type-fpc/pic/port:channel

  • type—et (Ethernet interfaces from 25G to 800G)

  • fpc Fixed to 0
  • pic: Fixed to 0
  • port You can check the port number from the front panel of the
  • channel

    Applicable only for channelized interfaces.

Interfaces on the QFX5140

Front Panel Port Numbering

Ports are numbered sequentially across the front panel.

Table 5: Front Panel Port Numbering
Port Range Type Description
0–23 QSFP112 Up to 400G ports
24–31 OSFP800 Up to 800G ports
32–33 SFP28 Auxiliary ports

All ports are phy-less and directly connected to the ASIC. Logical interfaces are created dynamically based on port configuration.

Examples
  • Non-channelized port:
  • QSFP112 split into 4 × 100G:
  • OSFP800 split into 8 × 100G:
et-0/0/24:0 through et-0/0/24:7