Cisco Systems Cisco IOS XR Installation or upgrade, Have a registered name in the same style

Glossary

DIMM	dual in-line memory module. Small circuit boards carrying memory integrated circuits, with signal and
	power pins on both sides of the board, in contrast to single-in-line memory modules (SIMMs).
disk0	Name of the flash disk on which the Cisco IOS XR software is stored.
disk1	Name of the optional flash disk on which the Cisco IOS XR software can be stored in preparation for
	installation or upgrade.
DNS	Domain Name System. Mechanism used in the Internet and on private intranets for translating names
	of host computers into addresses. The DNS also allows host computers not directly on the Internet to
	have a registered name in the same style.

DPT

DSC

Dynamic Packet Transport. DPT rings are dual, counter-rotating fiber rings. Both fibers are used concurrently to transport both data and control traffic.

designated shelf controller. The RP or RP pair that controls a standalone router or a multishelf system. The DSC is selected from among the route processors (RPs) installed in the router or multishelf system.

E

eBGP	external Border Gateway Protocol. BGP sessions are established between routers in different
	autonomous systems. eBGPs communicate among different network domains.
ECC	error correction code. ECC is used to correct errors within memories on the Cisco CRS-1 router.
egress	Outgoing channel.
Ethernet	Baseband LAN specification invented by Xerox Corporation and developed jointly by Xerox, Intel, and
	Digital Equipment Corporation. Ethernet networks use CSMA/CD and run over a variety of cable types
	at 10 Mbps. Ethernet standards are defined by the IEEE 802.3 specification.

F

fabric		Connectivity between all line cards. Also referred to as switch fabric.
fabric cable		Fabric cables are optical array cables that interconnect the fabric components in each chassis of a Cisco
		CRS-1 Carrier Routing System Multishelf System. Each fabric cable contains 72 fiber-optic strands,
		which are packaged as 6 ribbon cables with 12 fibers in each ribbon cable.
FC		fan controller. Two fan controller cards are installed in every line card chassis as a redundant pair to
		manage the fan assemblies; a BITS timing connector exists on the fan controller card.
FIB		Forwarding Information Base. Database that stores information about switching of data packets. A FIB
		is based on information in the Routing Information Base (RIB). It is the optimal set of selected routes
		that are installed in the line cards for forwarding. See also RIB.
flooding		Traffic-passing technique used by switches and bridges in which traffic received on an interface is sent
		out all the interfaces of that device except the interface on which the information was originally
		received.
		Cisco IOS XR Getting Started Guide
	OL-10957-02		GL-3