The show interface trunk command on an Aruba CX switch is used to display detailed information about all interfaces configured in trunk mode. The output includes the port's status, the native VLAN, and the list of allowed (tagged) VLANs. An administrator uses this information to verify the local configuration and compare it against the configuration of the peer switch connected to the trunk. A discrepancy in the native VLAN or the allowed VLAN list between the two ends of the link constitutes a VLAN mismatch, which this command helps to identify.

A. show vlan port: This command shows which VLANs are tagged or untagged on a specific port, but it is less direct for diagnosing trunk-specific mismatches compared to the dedicated trunk summary command.

B. show trunk vlan: This is not a valid command in the Aruba CX command-line interface (CLI). The syntax is incorrect.

D. display trunk status: The display command verb is characteristic of the HPE Comware OS, not the Aruba CX AOS-CX operating system, which uses the show verb.

1. Aruba CX 10.12 CLI Reference Guide

Page 1989

"show interface trunk" command.

The guide details the show interface trunk command

describing its function: "Shows information for interfaces configured as a trunk." The output fields shown in the guide

such as "Native VLAN" and "Allowed VLANs

" are the exact parameters required to check for VLAN mismatches on a trunk link.

2. ArubaOS-CX VLAN Configuration Guide

"Configuring VLANs" section.

This guide explains the concepts of native and tagged VLANs on trunk ports. It implicitly supports the use of show commands like show interface trunk to verify these configurations

which is the basis for identifying mismatches. For example

it states

"To display VLAN trunk configuration information

use the show interface trunk command."