When used 4x10G breakout optics on QFX5200, device dose not require explicit interface channelization configuration to channelize the interface. When it is configured explicitly on the device for interface, channelized interface will appear even though the other end link is down or shutdown.

Channelized interface will appear or not on QFX5200 when used 4x10G optics with channelization configuration and when the link is down or shutdown from the other end of the device.

For auto channelization when you plug a 4x10G breakout optic into a QSFP+ or QSFP28 port, the individual 10G interfaces might not appear unless:

• The connection is active (signal detected).
• The other device is correctly configured and turned on.
• Channelisation is set (This is not required in QFX5200 device).

If the other device turns off the port, your Juniper device may stop showing the 10G breakout interfaces, making it look like the optic is missing.

• But when used 4x10G breakout optics on QFX5200, device dose not require explicit interface channelization configuration to channelize the interface.
• When it is configured explicitly on the device for interface, channelized interface will appear even though the other end link is down or shutdown.

Attaching supporting logs:

labroot@jtac-qfx5200-32c-32q-r2051# run show chassis hardware

Hardware inventory:

Item       Version Part number Serial number   Description

Chassis                WH0219280725   QFX5200-32C-32Q

Pseudo CB 0

Routing Engine 0     BUILTIN   BUILTIN      RE-QFX5200-32C-32Q

FPC 0      REV 34  650-059719  WH0219280725   QFX5200-32C-32Q

 CPU           BUILTIN   BUILTIN      FPC CPU

 PIC 0          BUILTIN   BUILTIN      32X40G/32X100G-QSFP

  Xcvr 0    REV 01  740-054053  QF400C71     QSFP+-4X10G-SR <<<<<<<<<<< 4x10G breakout optic

Power Supply 0  REV 05  740-053352  1GD18190401    JPSU-850W-AC-AFO

Power Supply 1  REV 05  740-053352  1GD18190218    JPSU-850W-AC-AFO

Fan Tray 0                        QFX5200 Fan Tray 0, Front to Back Airflow - AFO

Fan Tray 1                        QFX5200 Fan Tray 1, Front to Back Airflow - AFO

Fan Tray 2                        QFX5200 Fan Tray 2, Front to Back Airflow - AFO

Fan Tray 3                        QFX5200 Fan Tray 3, Front to Back Airflow - AFO

Fan Tray 4                        QFX5200 Fan Tray 4, Front to Back Airflow - AFO

labroot@jtac-qfx5200-32c-32q-r2051> show interfaces terse

Interface        Admin Link Proto  Local         Remote

et-0/0/0        up  down. <<<<< Before channelization config when other end interface is down.

et-0/0/0.16386     up  down

gr-0/0/0        up  up

pfe-0/0/0        up  up

Added config for channelization on port 0 :

{labroot@jtac-qfx5200-32c-32q-r2051# show | compare

[edit]

+ chassis {

+   fpc 0 {

+     pic 0 {

+       port 0 {

+         channel-speed 10g;

+       }

+     }

+   }

+ }

{master:0}[edit]

labroot@jtac-qfx5200-32c-32q-r2051# commit

configuration check succeeds

commit complete

After channelization config when other end interface is down:

labroot@jtac-qfx5200-32c-32q-r2051> show interfaces terse

Interface        Admin Link Proto  Local         Remote

gr-0/0/0        up  up

pfe-0/0/0        up  up

pfe-0/0/0.16383     up  up  inet

                  inet6

pfh-0/0/0        up  up

pfh-0/0/0.16383     up  up  inet

pfh-0/0/0.16384     up  up  inet

sxe-0/0/0        up  up

sxe-0/0/0.16386     up  up

xe-0/0/0:0       up  down

xe-0/0/0:0.16386    up  down

xe-0/0/0:1       up  down

xe-0/0/0:1.16386    up  down

xe-0/0/0:2       up  down

xe-0/0/0:2.16386    up  down

xe-0/0/0:3       up  down

xe-0/0/0:3.16386    up  down

Other end Device: interface is down

root@jtac-qfx5200-32c-32q-r2052# run show interfaces terse

Interface        Admin Link Proto  Local         Remote

gr-0/0/0        up  up

pfe-0/0/0        up  up

pfe-0/0/0.16383     up  up  inet

                  inet6

pfh-0/0/0        up  up

pfh-0/0/0.16383     up  up  inet

pfh-0/0/0.16384     up  up  inet

sxe-0/0/0        up  up

sxe-0/0/0.16386     up  up

xe-0/0/0:0       down down

xe-0/0/0:0.0      up  down inet

xe-0/0/0:1       down down

xe-0/0/0:1.16386    up  down

xe-0/0/0:2       down down

xe-0/0/0:2.16386    up  down

xe-0/0/0:3       down down

xe-0/0/0:3.16386    up  down

sxe-0/0/1        up  down

sxe-0/0/1.16386     up  down

bme0          up  up

bme0.0         up  up  inet   128.0.0.1/2

                      128.0.0.4/2