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400ZR Optics Support on QFX5220-32CD and QFX5130 Switches

Learn about 400ZR optics and its configuration on QFX5220-32CD and QFX5130 switches.

400ZR is a standard for transporting 400Gb Ethernet. The standard aims at a minimum distance of 80 kilometers and implemented on small, pluggable form factor modules such as QSFP-DD.

Some of the applications that use 400ZR optics fiber are the following:

  • Data Center Interconnectivity (DCI) links

  • Campus DWDM

  • Metro DWDM

400ZR optics provides low latency and high speed.

Configure 400ZR Optics

The following are the guidelines when you configure the 400ZR optics:

The number of ports supporting the 400ZR optics is restricted based on the power budget on the QFX5220-32CD and QFX5130-32CD devices. For better thermal handling and power consumption, 16 ports (0, 3, 4, 7, 8, 11, 12, 15, 16, 19, 20, 23, 24, 27, 28, 31) in zigzag pattern support the 400ZR optics. Each port supporting the 400ZR optic is mapped to another port. You must configure the mapped port to “unused”. You must also configure the supported ports with a high-power mode to power on the optics module.

For example:

Use the following commands to set the corresponding port (port 1) to unused, if the 400ZR optic module is connected to port 0:

  • For QFX5220: set chassis fpc 0 pic 0 port 1 unused

  • For QFX5130:set interfaces et-0/0/1 unused

The set chassis and set interfaces commands power on the port 0.

Use the following commands if the 400ZR optics module is connected to port 0:

  • For QFX5220: set interfaces et-0/0/0 optics-options high-power-mode

  • For QFX5130: set interfaces et-0/0/0 optics-options high-power-mode

The following table shows the supported ports and corresponding unused ports:

Table 1: Supported Ports and Corresponding Unused Ports
Ports Supporting 400ZR Optics Corresponding Ports to Be Set Unused
0 1
3 2
4 5
7 6
8 9
11 10
12 13
15 14
16 17
19 18
20 21
23 22
24 25
27 26
28 29
31 30

  • If the 400ZR optics is used in channelized mode (4x100G), the high-power mode configuration needs to be present on channel 0 (for both QFX5130-32CD and QFX5220-32CD).

    set interfaces et-0/0/0:0 optics-options high-power-mode

  • If the 400ZR optics module is inserted in an unsupported port, the module is not powered on.

    The following alarm is raised on the port:

    High power optics can not be supported on the port

  • The following alarm is raised if the 400ZR optics module is plugged into the supported port, but high-power mode configuration is not configured.

    optics-options high-power-mode config needed to support high power optics on the port

  • If none of the ports have a 400ZR optics module, high-power mode and unused port settings are not required.