Cisco Systems Cisco uBR10012 manual Also PXF Network Processors, GL-11

Glossary

PRE	Performance routing engine. The central routing unit for the Cisco uBR10012 universal broadband
	router. The PRE performs all Layer 2 and Layer 3 packet manipulation related to routing and
	forwarding through the Cisco uBR10012 routers. Use dual PREs in a single chassis for redundancy. See
	also PXF Network Processors.
PXF Network	Parallel eXpress Forwarding network processors. A pair of programmable ASICs that perform parallel
Processors	processing to support high performance Layer 3 forwarding.

Q

QoS

QPPB

Quality of service. A measure of performance for a transmission system that reflects its transmission quality and service availability.

QoS Policy Propagation by BGP. A feature that classifies packets by IP precedence based on BGP community lists, BGP autonomous system paths, and access lists. After a packet is classified, other quality of service features such as committed access rate (CAR) and Weighted Random Early Detection (WRED) can specify and enforce policies to fit a business model.

Quality of Service See QoS.

R

RAM

Random Access Memory

Read only memory

Redundancy

Remote monitoring

Request for comments

RFC

Random-access memory. Volatile memory that can be read and written by a microprocessor.

See RAM.

See ROM.

In internetworking, the duplication of devices, services, or connections so that, in the event of a failure, the redundant devices, services, or connections can perform the work of those that failed.

See RMON.

See RFC.

Request for comments. A document series used as the primary means for communicating information about the Internet. Some RFCs are designated by the IAB as Internet standards. Most RFCs document protocol specifications such as Telnet and FTP, but some are humorous or historical. RFCs are available online from numerous sources.

RMON	Remote Monitoring. MIB agent specification described in RFC 1271 that defines functions for the
	remote monitoring of networked devices. The RMON specification provides numerous monitoring,
	problem detection, and reporting capabilities.
ROM	Read only memory. Nonvolatile memory that can be read, but not written, by the microprocessor.

	Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
OL-18259-01		GL-11