This manual details the ARP commands for Cisco NCS 5000 series routers, including the NCS 540. It covers configuration and monitoring of the Address Resolution Protocol (ARP). Key commands include `arp` for static entries, `arp gratuitous ignore`, `arp learning`, `arp purge-delay`, `arp timeout`, `clear arp-cache`, `local-proxy-arp`, `priority-timeout`, `proxy-arp`, `route distance`, `route metric`, `show arp`, and `show arp traffic`. Each command section provides syntax, default values, command modes, history, and usage guidelines. Examples illustrate command usage.