H3C交换机的常用命令有：

1. 查看端口状态：display interface [interface-type [interface-number]]
2. 配置端口VLAN：configure terminal interface [interface-type] [interface-number] port link-type hybrid vlan [vlan-id]
3. 查看路由表：display ip routing-table
4. 配置静态路由：configure terminal ip route-static 0.0.0.0 0.0.0.0 gateway address
5. 查看ARP表：display arp all
6. 配置静态ARP条目：configure terminal arp static ip_address mac_address interface interface_name