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Glossary
GL-7
User Guide for Internetwork Performance Monitor
OL-11291-01
RTR
See SA Agent.
RTT
round-trip time. Time required for a network packet to travel from the source to the destination and
back. RTT includes the time required for the destination to process the message from the source and
generate a reply. The latency measurements taken by IPM and SA Agent are round-trip time latency
measurements.
RTTMON MIB
round-trip time monitor management information base. Proprietary MIB created by Cisco to obtain
and store round-trip time statistics. The MIB is implemented by the Cisco IOS software in the source
router. The IPM application obtains the round-trip time statistics from this MIB. You can access
additional information about this MIB, on the Internet at
ftp://ftp.cisco.com/pub/mibs/v2/CISCO-RTTMON-MIB.my. This MIB has been extended to
monitor network performance statistics in addition to round-trip time statistics.
RU
request/response unit. Request and response messages exchanged between NAUs in an SNA
network.
S
SA Agent
Service Assurance Agent. Feature of Cisco IOS software which allows you to measure and monitor
network performance between a Cisco router and a remote device.
SA Agent Responder
Component embedded in a target Cisco router running version 12.1 or later of the Cisco IOS
software. Its function is to respond to SA Agent request packets from a source router running the
SA Agent software. The Responder can listen on any user-defined port for UDP and TCP protocols.
The SA Agent Responder is required only for specific collector types, such as Enhanced UDP for
monitoring jitter in Voice-over-IP networks.
server
Node or software program that provides services to clients. See also client.
Service Assurance
Agent
See SA Agent.
Simple Network
Management Protocol
See SNMP.
SNA
Systems Network Architecture. Large, complex, feature-rich network architecture developed in the
1970s by IBM. Similar in some respects to the OSI reference model, but with several differences.
Essentially, SNA is composed of seven layers.
SNMP
Simple Network Management Protocol. Network management protocol used almost exclusively in
TCP/IP networks. SNMP provides a means to monitor and control network devices, and to manage
configurations, statistics collection, performance, and security.
SNMP agent
Simple Network Management Protocol agent. Resides in the source router and is provided as part of
Cisco IOS software. The SNMP agent receives requests from the IPM SNMP server to perform all
IPM-related functions.
source
Originating router from which IPM takes network performance measurements.
source-route bridging
See SRB.