Hirschmann RS20 Reference Manual page 218

Glossary
first port will be forwarded onto the
second port as well. The
administrator places a protocol
analyzer on the port receiving the
mirrored data to monitor each
segment separately. The analyzer
captures and evaluates the data
without affecting the client on the
original port. The monitor port may
be a port on the same SwitchModule
with an attached RMON probe, a
port on a different SwitchModule in
the same hub, or the SwitchModule
processor. Port mirroring can
consume significant CPU resources
while active. Better choices for long-
term monitoring may include a
passive tap like an optical probe or
an Ethernet repeater.
Protocol Data Unit. PDU is a
packet of data passed across a
network. The term implies a specific
layer of the OSI model and a specific
protocol.
Protocol Independent Multicast –
Dense Mode. Like DVMRP, PIM-
DM uses a flood and prune protocol
for building multicast trees.
However, unlike DVMRP, PIM-DM
uses existing unicast protocols for
determing the route to the source.
Q
QoS. See "Quality of Service" on
page 218.
Quality of Service. QoS is a
networking term that specifies a
guaranteed level of throughput.
CLI L2B
Release 4.0 11/07
Throughput is the amount of data
transferred from one device to
another or processed in a specified
amount of time - typically,
throughputs are measured in bytes
per second (Bps).
R
Real-Time Operating System.
RTOS is a component of the OSAPI
module that abstracts operating
systems with which other systems
can interface.
Resource Reservation Setup
Protocol. RSVP is a new Internet
protocol being developed to enable
the Internet to support specified
Qualities-of-Service (QoS). Using
RSVP, an application will be able to
reserve resources along a route
from source to destination. RSVP-
enabled routers will then schedule
and prioritize packets to meet the
prioritization assigned by QoS.
RSVP is a chief component of a new
type of Internet being developed,
known broadly as an integrated
services Internet. The general idea
is to enhance the Internet to support
transmission of real-time data.
RFC. Request For Comment.
RIP. See "Routing Information
Protocol" on page 218.
Routing Information Protocol.
RIP is the routing protocol used by
the routed process on Berkeley-
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