3Com 2924-PWR User Guide - Page 219

Switch Features 219 Table 9 Features of the Baseline Switch 2924-PWR Plus (continued) Feature Power over Ethernet RADIUS Clients Rapid Spanning Tree Remote Monitoring Self-Learning MAC Addresses SNMP Alarms and Trap Logs SNMP Versions 1 and 2 Spanning Tree Protocol SSL Static MAC Entries TCP TFTP Trivial File Transfer Protocol Virtual Cable Testing Description Provides power to devices over LAN connection. RADIUS is a client/server-based protocol. A RADIUS server maintains a user database, which contains per-user authentication information, such as user name, password and accounting information. Spanning Tree can take 30-60 seconds for each host to decide whether its ports are actively forwarding traffic. Rapid Spanning Tree (RSTP) detects uses of network topologies to enable faster convergence, without creating forwarding loops. Remote Monitoring (RMON) is an extension to SNMP, which provides comprehensive network traffic monitoring capabilities (as opposed to SNMP which allows network device management and monitoring). RMON is a standard MIB that defines current and historical MAC-layer statistics and control objects, allowing real-time information to be captured across the entire network. The device enables automatic MAC address learning from incoming packets. The MAC addresses are stored in the Bridging Table The system logs events with severity codes and timestamps. Events are sent as SNMP traps to a Trap Recipient List. Simple Network Management Protocol (SNMP) over the UDP/IP protocol controls access to the system. 802.1d Spanning tree is a standard Layer 2 switch requirement that allows bridges to automatically prevent and resolve L2 forwarding loops. Switches exchange configuration messages using specifically formatted frames and selectively enable and disable forwarding on ports. Secure Socket Layer (SSL) is an application-level protocol that enables secure transactions of data through privacy, authentication, and data integrity. It relies upon certificates and public and private keys. MAC entries can be manually entered in the Bridging Table, as an alternative to learning them from incoming frames. These user-defined entries are not subject to aging, and are preserved across resets and reboots. Transport Control Protocol (TCP). TCP connections are defined between 2 ports by an initial synchronization exchange. TCP ports are identified by an IP address and a 16-bit port number. Octets streams are divided into TCP packets, each carrying a sequence number. The device supports boot image, software and configuration upload/download via TFTP. VCT detects and reports copper link cabling occurrences, such as open cables and cable shorts.