Description

After upgrading to a newer Junos OS version, unconfigured AE interfaces may not be shown in the output of the show interfaces terse command.

This article explains that such behavior is expected and provides a reason for the unconfigured AE interfaces to not be shown in the above command output.

 

Symptoms

When link aggregation group (LAG) devices count is set to 10, but only ae0 is configured, different Junos OS versions may show different results when the show interfaces terse command is executed.

Junos OS Release 14.1X53 

user@router#set chassis aggregated-devices ethernet device-count 10
user@router#set interfaces ae0 aggregated-ether-options lacp active
user@router# commit

user@router> show interfaces terse | match ae >>> It shows from ae0 to ae9 because device-count set to 10.
ae0                     up    down
ae1                     up    down
ae2                     up    down
ae3                     up    down
ae4                     up    down
ae5                     up    down
ae6                     up    down
ae7                     up    down
ae8                     up    down
ae9                     up    down
 

Junos OS Release 15.1 

user@router#set chassis aggregated-devices ethernet device-count 10
user@router#set interfaces ae0 aggregated-ether-options lacp active
user@router#commit

user@router> show interfaces terse | match ae    >>> Here only ae0 is shown even if device-count is set to 10.
ae0                     up    down

 

Solution

The behavior changed from Junos OS Release 14.2R1 wherein AE physical interfaces are not created only with set chassis aggregated-devices ethernet device-count <n> configuration. The set interfaces configuration must also be present for the particular AE interface in order to create it.

Without AE-specific configuration, the interface will not be shown in the show interfaces terse output.

 

This behavior is expected. To create the AE interface and to see its details in show interfaces terse output in devices that run Junos OS Release 14.2R1 and later, provide AE-specific details by using the set interfaces command.