This manual is a command reference for HP A5500 EI & A5500 SI Switch Series Security. It details AAA configuration commands, including general AAA, RADIUS, and HWTACACS configurations. It also covers 802.1X, EAD fast deployment, MAC authentication, portal configuration, port security, user profile, password control, HABP, PKI, IPsec, SSH2.0, SFTP, SSL, TCP attack protection, IP source guard, ARP attack protection, ND attack defense, and URPF configurations. Each command is described with its syntax, view, default level, parameters, description, and examples.