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

ON THIS PAGE