Use when user asks about Huawei USG firewall configuration, network protocols (OSPF, BGP, IPsec, VPN, NAT, ACL, security-policy), or needs CLI commands for Huawei devices. Triggers on keywords like '华为', 'USG', 'firewall', 'OSPF', 'BGP', 'NAT', 'VPN', 'ACL', '防火墙', '安全策略'.