Cisco Systems Cisco IOS XR Provides other information relevant to IP packet processing, Rip, GL-5

Glossary

I

ICMP	Internet Control Message Protocol. Network layer Internet (TCP/IP) protocol that reports errors and
	provides other information relevant to IP packet processing.
IEP	IP explicit path. List of IP addresses, each representing a node or link in the explicit path.
IETF	Internet Engineering Task Force. Task force consisting of over 80 working groups responsible for
	developing Internet standards. The IETF operates under the auspices of ISOC.
IGMP	Internet Group Management Protocol. Governs the management of multicast groups in a TCP/IP
	network. Used by IP hosts to report their multicast group memberships to an adjacent multicast router.
IGP	Interior Gateway Protocol. Internet protocol used to exchange routing information within an
	autonomous system. Examples of common Internet IGPs include IGRP, OSPF, and RIP. See also OSPF
	and RIP.

ingress

installed software set

IOS XR

IP

Incoming channel.

The set of Cisco IOS XR software packages installed on a router.

The Cisco operating system used on the Cisco CRS-1 router and Cisco XR 12000 Series Router.

Internet Protocol. Network layer protocol in the TCP/IP stack offering a connectionless internetwork service. IP provides features for addressing, type-of-service specification, fragmentation and reassembly, and security.

IPv4

IPv6

IPX

IS-IS

IP Version 4. Network layer for the TCP/IP protocol suite. A connectionless, best-effort packet switching protocol.

IP Version 6. Replacement for IPv4. A next-generation IP protocol. IPv6 is backward compatible with and 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 from servers to workstations. IPX is similar to IP and XNS.

Intermediate System-to-Intermediate System. OSI link-state hierarchical routing protocol based on DECnet Phase V routing, whereby ISs (routers) exchange routing information based on a single metric to determine network topology.

K

keepalive interval

keepalive message

Period of time between each keepalive message sent by a network device.

Message sent by one network device to inform another network device that the virtual circuit between the two is still active.

	Cisco IOS XR Getting Started Guide
OL-10957-02		GL-5