What command would you use to find interfaces with custom MTU configuration?

The command to find interfaces with a custom MTU configuration is "show configuration interfaces | display set | match mtu." This command is structured to retrieve the interface configurations from the device's operational state.

Here's how the command works:

1. The "show configuration interfaces" portion pulls up the interface configuration details, giving insight into how each interface is configured within the system.

2. The "| display set" filters this output into a format where each line of configuration is presented in a set format, which is often easier to read and understand, especially for configurations that have been applied.

3. The "match mtu" part of the command further filters the output to only display lines containing "mtu," allowing the user to quickly identify any interfaces that have a custom MTU value set.

This command is effective for those needing to audit interface settings or troubleshoot network issues related to Maximum Transmission Unit sizes. The other options do not provide the same level of targeted information about MTU settings because they either lack the necessary filters or do not retrieve configuration details specifically.