Glossary
GL-11
Cisco IOS XR Getting Started Guide
OL-10957-02
SNMP Simple Network Management Protocol. SNMP is the protocol governing network management and the
monitoring of network devices and their functions. It is not necessarily limited to TCP/IP networks.
SNMPv3 Simple Network Management Protocol Version 3. An interoperable standards-based protocol for
network management. SNMPv3 provides secure access to devices by a combination of au thenticating
and encrypting packets over the network.
software
configuration
A list of packages activated for a particular node. A software configuration consists of a boot pac kage
and additional feature packages.
SONET Synchronous Optical Network. A standard format for transporting a wide range of digital
telecommunications services over optical fiber. SONET is characterized by standard line rates, optical
interfaces, and signal formats. See also SDH.
SP service processor. An SP on each card maintains an internal management connection to the shelf
controller for the rack. The SP is referred to in CLI commands to identify the nodeID for fabric, alarm
and fan controller cards.
Example:
RP/0/RPO/CPU:router# admin show controllers fabric connectivity location 0/SM0/SP
SPE Synchronous Payload Envelope. Portion of the SONET frame containing overhead information (POH
and user data).
SPF shortest path first. Routing algorithm that iterates on length of path to determine a shortest-path
spanning tree. Commonly used in link-state routing algorithms. Sometimes called Dijkstra's algorithm.
SSH Secure Shell. A protocol that provides a secure remote connection to a router through a Transmission
Control Protocol (TCP) application.
SSL secure socket layer. A secure socket between two enti ties with authentication.
standby Denotes an inactive card or process that waits to become active; standby cards or processes are also
sometimes denoted as backup.
startup
configuration
The router configuration designated to be applied on the next router startup.
subinterface Virtual interfaces created on a hardware interface. These software-defined interfaces allow for
segregation of traffic into separate logical channels on a single hardware interface and better utilization
of the available bandwidth on the physical interface.
switchover A switch between the active and standby cards. The switchover can be initiated by command, or it can
occur automatically when the active card fails.
system reload Reload of a router node.
system restart Soft reset of a router node. This involves restarting all processes running on that node.
T
TAC Cisco Technical Assistance Center.