Cisco XR 12000 Series Getting Started Manual page 157

Chapter
Name of the optional flash disk on which the Cisco IOS XR software can be stored in preparation for
disk1
installation or upgrade.
Domain Name System. Mechanism used in the Internet and on private intranets for translating names
DNS
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.
Dynamic Packet Transport. DPT rings are dual, counter-rotating fiber rings. Both fibers are used
DPT
concurrently to transport both data and control traffic.
designated shelf controller. The RP that controls a standalone router or a multishelf system. The DSC
DSC
is selected from among the route processors (RPs) installed in the router or multishelf system.
E
external Border Gateway Protocol. BGP sessions are established between routers in different
eBGP
autonomous systems. eBGPs communicate among different network domains.
error correction code. ECC is used to correct errors within memories on the Cisco CRS router.
ECC
Outgoing channel.
egress
Baseband LAN specification invented by Xerox Corporation and developed jointly by Xerox, Intel, and
Ethernet
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
Connectivity between all line cards. Also referred to as switch fabric.
fabric
fan controller. Two fan controller cards are installed in every line card chassis as a redundant pair to
FC
manage the fan assemblies; a BITS timing connector exists on the fan controller card.
Forwarding Information Base. Database that stores information about switching of data packets. A FIB
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.
Traffic-passing technique used by switches and bridges in which traffic received on an interface is sent
flooding
out all the interfaces of that device except the interface on which the information was originally
received.
Process of sending a frame toward its ultimate destination by way of an internetworking device.
forwarding
fast reroute. Automatically reroutes traffic on a label switched path (LSP) if a node or link in an LSP
FRR
fails. FRR reduces the loss of packets traveling over an LSP.
File Transfer Protocol. Application protocol, part of the TCP/IP protocol stack, used for transferring
FTP
files between network nodes. FTP is defined in RFC 959.
OL-24755-01
Cisco IOS XR Getting Started Guide for the Cisco XR 12000 Series Router
GL-145