Cisco ASR 9000 User Manual

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Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide
OL-28417-02
Chapter
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
Dynamic Packet Transport. DPT rings are dual, counter-rotating fiber rings. Both fibers are used
concurrently to transport both data and control traffic.
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 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.
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.
forwarding
Process of sending a frame toward its ultimate destination by way of an internetworking device.
FRR
fast reroute. Automatically reroutes traffic on a label switched path (LSP) if a node or link in an LSP
fails. FRR reduces the loss of packets traveling over an LSP.
FTP
File Transfer Protocol. Application protocol, part of the TCP/IP protocol stack, used for transferring
files between network nodes. FTP is defined in RFC 959.

Cisco ASR 9000 Specifications

General

Brand	Cisco
Model	ASR 9000
Category	Network Router
Language	English