3Com 3CBLSG48 User Guide - Page 202

appendix b: DEVICE SPECIFICATION AND FEATURES 191 Table 11 Features of the Baseline Switch 2948-SFP Plus Feature Port-based Virtual LANs Description Port-based VLANs classify incoming packets to VLANs based on their ingress port. Port Mirroring Port mirroring monitors and mirrors network traffic by forwarding copies of incoming and outgoing packets from a monitored port to a monitoring port. Users specify which target port receives copies of all traffic passing through a specified source port. RADIUS Clients 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. Rapid Spanning Tree 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 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. Self-Learning MAC Addresses The device enables automatic MAC address learning from incoming packets. The MAC addresses are stored in the Bridging Table. SNMP Alarms and Trap Logs The system logs events with severity codes and timestamps. Events are sent as SNMP traps to a Trap Recipient List. SNMP Versions 1 and 2 Simple Network Management Protocol (SNMP) over the UDP/IP protocol controls access to the system. Spanning Tree Protocol 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. SSL 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. Static MAC Entries 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.