Introduction 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.
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