Dell PowerConnect 5448 User's Guide - Page 21

Command Line Interface Command Line Interface (CLI) syntax and semantics conform as much as possible to common industry practice. CLI is composed of mandatory and optional elements. The CLI interpreter provides command and keyword completion to assist user and shorten typing. Syslog Syslog is a protocol that allows event notifications to be sent to a set of remote servers, where they can be stored, examined and acted upon. Multiple mechanisms are implemented to send notification of significant events in real time, and keep a record of these events for after-the-fact usage. For more information on Syslog, see "Managing Logs" on page 93. SNTP The Simple Network Time Protocol (SNTP) assures accurate network device clock time synchronization up-to the millisecond. Time synchronization is performed by a network SNTP server. Time sources are established by Stratums. Stratums define the distance from the reference clock. The higher the stratum (where zero is the highest), the more accurate the clock. For more information, see "Configuring SNTP Settings" on page 81. Traceroute Traceroute enables discovering IP routes that packets were forwarded along during the forwarding process. The CLI Traceroute utility can be executed from either the user-exec or privileged modes. 802.1ab (LLDP-MED) The Link Layer Discovery Protocol allows network managers to troubleshoot and enhance network management by discovering and maintaining network topologies over multi-vendor environments. LLDP discovers network neighbors by standardizing methods for network devices to advertise themselves to other systems, and to store discovered information. The multiple advertisement sets are sent in the packet Type Length Value (TLV) field. LLDP devices must support chassis and port ID advertisement, as well as system name, system ID, system description, and system capability advertisements. LLDP Media Endpoint Discovery (LLDP-MED) increases network flexibility by allowing different IP systems to co-exist on a single network LLDP. It provides detailed network topology information, emergency call service via IP Phone location information, and troubleshooting information. Security Features 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. Introduction 21