Cisco CRS-1 - Carrier Routing System Router Getting Started Manual page 265

I
internal Border Gateway Protocol. BGP sessions are established between routers in the same
iBGP
autonomous system.
Internet Control Message Protocol. Network layer Internet (TCP/IP) protocol that reports errors and
ICMP
provides other information relevant to IP packet processing.
IP explicit path. List of IP addresses, each representing a node or link in the explicit path.
IEP
Internet Engineering Task Force. Task force consisting of over 80 working groups responsible for
IETF
developing Internet standards. The IETF operates under the auspices of ISOC
Internet Group Management Protocol. Governs the management of multicast groups in a TCP/IP
IGMP
network. Used by IP hosts to report their multicast group memberships to an adjacent multicast router.
Interior Gateway Protocol. Internet protocol used to exchange routing information within an
IGP
autonomous system. Examples of common Internet IGPs include IGRP, OSPF, and RIP. See also OSPF
and RIP.
Incoming channel.
Ingress
The set of Cisco IOS XR software packages installed on a Cisco CRS-1 Series router.
installed software
set
The Cisco operating system used on Cisco CRS-1 Series routers and Cisco 12000 Series routers.
IOS XR
Internet Protocol. Network layer protocol in the TCP/IP stack offering a connectionless internetwork
IP
service. IP provides features for addressing, type-of-service specification, fragmentation and
reassembly, and security.
IP Version 4. Network layer for the TCP/IP protocol suite. A connectionless, best-effort packet
IPv4
switching protocol.
IP Version 6. Replacement for IPv4. A next generation IP protocol. IPv6 is backward compatible with
IPv6
and is designed to fix the shortcomings of IPv4, such as data security and maximum number of user
addresses. IPv6 increases the address space from 32 to 128 bits, providing for an unlimited number of
networks and systems. It also supports quality of service (QoS) parameters for real-time audio and
video.
Internetwork Packet Exchange. NetWare network layer (Layer 3) protocol used for transferring data
IPX
from servers to workstations. IPX is similar to IP and XNS.
Intermediate System-to-Intermediate System. OSI link-state hierarchical routing protocol based on
IS-IS
DECnet Phase V routing, whereby ISs (routers) exchange routing information based on a single metric
to determine network topology.
Incremental Shortest Path First (SPF). See also SPF.
ISPF
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
Glossary
.
GL-7