... serial interface can function as a DCE or DTE. It supports multiple physical layer protocols, such as V.24 ... 1P, IEEE 802.1Q, IEEE 802.3, VLAN management, MAC address management, MSTPIPv4 unicast routingRouting policy, static route, RIP, OSPF ... , DHCP snooping, CPCAR, blacklist, IP source tracingManagement and maintenanceUpgrade management, device management, GTL, SNMP(v1/v2c/v3), NTP, CWMP, Auto-Config ...