This article explains an issue observed when changing the aggregate Ethernet (AE) interface speed from 400G to 100G, which leads to missing interface descriptions and LACP outputs in CLI. The issue is caused by a misconfiguration that is not properly restricted in the current EVO software version.

Changes:

[edit interfaces ae211 aggregated-ether-options]

- link-speed 400g;

+ link-speed 100g;

[edit interfaces ae212 aggregated-ether-options]

- link-speed 400g;

+ link-speed 100g;

After changing the link-speed from 400g to 100g

> show lacp interfaces et-X/X/X

> show interfaces descriptions et-X/X/X

After changing the AE interface speed from 400G to 100G, the following symptoms may be observed:

- Interface descriptions are not displayed.

- LACP outputs are missing or incomplete.

- CLI commands such as `show interfaces` do not return expected results.

Root Cause:

The issue occurs because the EVO software does not enforce a restriction that prevents users from configuring an AE interface with a speed different from its member interfaces.

Changing the AE speed to a value (e.g., 100G) that does not match the underlying member interface speeds (e.g., 400G) is an invalid configuration. However, due to a bug in the affected EVO versions, this misconfiguration is allowed, resulting in unexpected interface behavior and output anomalies.

Impact:

- Inconsistent or missing output for show interface, show lacp, and related CLI commands.

- Operational difficulties due to a lack of visibility into AE member interface status and LACP details.

Solution:

This is a known bug in specific versions of the EVO software.

To resolve this issue:

* Upgrade to the EVO version, where the bug is fixed.

* Ensure that AE interface speeds always match the speeds of their associated member interfaces to avoid similar misconfigurations.

Workaround:

Avoid changing AE interface speeds to values that do not align with the physical member interface speeds.