What is required in order for Multi-Switch CLI to be implemented?

Arista's Multi-Switch CLI feature leverages the Extensible Messaging and Presence Protocol (XMPP) to enable a single command-line interface to manage a group of switches. This architecture requires a central XMPP server, also known as a broker, to facilitate communication. The Arista switches act as XMPP clients that connect to this server and join a multi-user chat room. Without the XMPP server, there is no central point for the switches to connect to, and the feature cannot be implemented. EJabberd is a commonly used open-source XMPP server suitable for this purpose.

A. While enabling XMPP on the Arista devices is a necessary configuration step, the external XMPP server is the foundational infrastructure that must be in place first.

C. Management is performed via the native Arista EOS command-line interface on a master switch, not through a separate, third-party instant messaging client application.

D. An SSD is a hardware choice related to performance and logging capacity, not a fundamental software or architectural requirement for the Multi-Switch CLI feature to function.

1. Arista EOS Configuration Guide: In the section on Multi-Switch CLI, the guide explicitly states the prerequisite: "Multi-Switch CLI uses the Extensible Messaging and Presence Protocol (XMPP) to enable communication between switches. To use Multi-Switch CLI, you must first set up an XMPP server..." (Arista EOS Version 4.28.0F Configuration Guide, Section 43.10: Multi-Switch CLI).

2. Arista EOS Configuration Guide: The guide further clarifies the architecture: "The switches act as XMPP clients, connecting to the server and joining a multi-user chat room. One switch is designated as the master, and commands entered on the master are sent to all other switches in the chat room." This explains the client-server relationship and invalidates the need for a separate IM client. (Arista EOS Version 4.28.0F Configuration Guide, Section 43.10.1: Multi-Switch CLI Operation).