IANA

Internet Assigned Numbers Authority. A regulatory group that maintains all assigned and registered Internet numbers, such as IP and multicast addresses. See also NIC.

IBGP

Internal BGP. A BGP configuration in which sessions are established between routers in the same autonomous systems (ASs).

ICMP

Internet Control Message Protocol. Used in router discovery, ICMP allows router advertisements that enable a host to discover addresses of operating routers on the subnet.

ICMP Router Discovery Protocol

See IRDP.

IDE

Integrated Drive Electronics. Type of hard disk on the Routing Engine.

IDEA

International Data Encryption Algorithm. An algorithm that uses a 128-bit key and is one of the methods at the heart of Pretty Good Privacy (PGP). IDEA is patented by Ascom Tech AG and is popular in Europe.

Idle

Initial BGP neighbor state where the local router is refusing all incoming session requests.

IDS

Intrusion detection service. A service that inspects all inbound and outbound network activity and identifies suspicious patterns that may indicate a network or system attack from someone attempting to break into or compromise a system.

IEC

International Electrotechnical Commission. See ISO.

IEEE

Institute of Electrical and Electronics Engineers. An international professional society for electrical engineers.

IETF

Internet Engineering Task Force. An international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and the smooth operation of the Internet.

I-frames

Information frame used to transfer data in sequentially numbered logical link control protocol data units (LPDUs) between link stations.

IGMP

Internet Group Management Protocol. Used with multicast protocols to determine whether group members are present.

IGP

Interior gateway protocol, such as IS-IS, OSPF, and RIP.

IKE

Internet Key Exchange. Part of IPSec that provides ways to securely negotiate the shared private keys that the AH and ESP portions of IPSec need to function properly. IKE employs Diffie-Hellman methods and is optional in IPSec (the shared keys can be entered manually at the endpoints).

ILMI

Integrated Local Management Interface. A specification developed by the ATM Forum that incorporates network management capabilities into the ATM user-to-network interface (UNI) and provides bidirectional exchange of management information between UNI management entities (UMEs).

IMEI

International Mobile Station Equipment Identity. A unique code used to identify an individual mobile station to a GSM network.

import

Installation of routes from the routing protocols into a routing table.

IMSI

International Mobile Subscriber Identity. Information that identifies a particular subscriber to a GSM network.

IMT-2000

International Mobile Telecommunications 2000. Global standard for third-generation (3G) wireless communications, defined by a set of interdependent ITU Recommendations. IMT-2000 provides a framework for worldwide wireless access by linking the diverse systems of terrestrial and/or satellite-based networks.

inet.0

Default JUNOS software routing table for IPv4 unicast routers.

inet.1

Default JUNOS software routing table for storing the multicast cache for active data streams in the network.

inet.2

Default JUNOS software routing table for storing unicast IPv4 routes specifically used to prevent forwarding loops in a mulitcast network.

inet.3

Default JUNOS software routing table for storing the egress IP address of an MPLS label-switched path.

inet.4

Default JUNOS software routing table for storing information generated by the Multicast Source Discovery Protocol (MSDP).

inet6.0

Default JUNOS software routing table for storing unicast IPv6 routes.

infinity metric

Metric value used in distance-vector protocols to represent an unusable route. For RIP, the infinity metric is 16.

ingress router

In MPLS, the first router in a label-switched path (LSP). See also egress router.

Init

OSPF adjacency state where the local router has received a hello packet but bidirectional communication is not yet established.

insert

JUNOS software command that allows a user to reorder terms in a routing policy or a firewall filter, or change the order of a policy chain.

instance.inetflow.0

Routing table that shows route flows through BGP.

Integrated Local Management Interface

See ILMI.

Integrated Drive Electronics

See IDE.

Integrated Services Digital Network

See ISDN.

intelligent queuing

See IQ.

inter-AS routing

Routing of packets among different autonomous systems (ASs). See also EBGP.

intercluster reflection

In a BGP route reflection, the redistribution of routing information by a route reflector system to all nonclient peers (BGP peers not in the cluster). See also route reflection.

interface cost

Value added to all received routes in a distance-vector network before placing them into the routing table. The JUNOS software uses a cost of 1 for this value.

interface routes

Routes that are in the routing table because an interface has been configured with an IP address. Also called direct routes.

intermediate system

In IS-IS, the network entity that sends and receives packets and can also route packets.

internal BGP

See IBGP.

internal Ethernet

Another name for the fxp1 and fxp2 interfaces that provide communications between the Routing Engine and the Packet Forwarding Engine.

International Data Encryption Algorithm

See IDEA.

International Mobile Station Equipment Identity

See IMEI.

International Mobile Subscriber Identity

See IMSI.

International Mobile Telecommunications- 2000

See IMT-2000.

International Organization for Standardization

See ISO.

International Telecommunication Union

See ITU-T.

Internet Assigned Numbers Authority

See IANA.

Internet Control Message Protocol

See ICMP.

Internet Engineering Task Force

See IETF.

Internet Group Management Protocol

See IGMP.

Internet Key Exchange

See IKE.

Internet Processor ASIC

Juniper Networks ASIC responsible for using the forwarding table to make routing decisions within the Packet Forwarding Engine. The Internet Processor ASIC also implements firewall filters.

Internet Protocol

See IP.

Internet Security Association and Key Management Protocol

See ISAKMP.

Internet service provider

See ISP.

interprovider VPN

VPN that provides connectivity between separate autonomous systems (ASs) with separate border edge routers. It is used by VPN customers who have connections to several different ISPs, or different connections to the same ISP in different geographic regions, each of which has a different AS.

intra-AS routing

Routing of packets within a single autonomous system (AS). See also IBGP.

intrusion detection service

See IDS.

I/O Manager ASIC

Juniper Networks ASIC responsible for segmenting data packets into 64-byte J-cells and for queuing result cells prior to transmission.

IP

Internet Protocol. The protocol used for sending data from one point to another on the Internet.

IP Control Protocol

See IPCP.

IPCP

IP Control Protocol. Protocol that establishes and configures IP over the Point-to-Point Protocol (PPP).

IPSec

IP Security. A standard way to add security to Internet communications. The secure aspects of IPSec are usually implemented in three parts: the authentication header (AH), the Encapsulating Security Payload (ESP), and the Internet Key Exchange (IKE).

IP Security

See IPSec.

IQ

Intelligent queuing. M-series and T-series routing platform interfaces that offer granular quality-of-service (QoS) capabilities; extensive statistics on packets and bytes that are transmitted, received, or dropped; and embedded diagnostic tools.

IRDP

ICMP Router Discovery Protocol. A protocol that enables a host to determine the address of a router that it can use as a default gateway.

ISAKMP

Internet Security Association and Key Management Protocol. A protocol that allows the receiver of a message to obtain a public key and use digital certificates to authenticate the sender's identity. ISAKMP is designed to be key exchange independent; that is, it supports many different key exchanges. See also IKE and Oakley.

ISDN

Integrated Services Digital Network. A set of digital communications standards that enable the transmission of information over existing twisted-pair telephone lines at higher speeds than standard analog telephone service. An ISDN interface provides multiple B-channels (bearer channels) for data and one D-channel for control and signaling information. See also B-channel and D-channel.

IS-IS

Intermediate System-to-Intermediate System. A link-state, interior gateway routing protocol for IP networks that also uses the shortest-path-first (SPF) algorithm to determine routes.

ISO

International Organization for Standardization. A worldwide federation of standards bodies that promotes international standardization and publishes international agreements as International Standards.

ISP

Internet service provider. Company that provides access to the Internet and related services.

ITU-T

International Telecommunication Union Telecommunication Standardization (formerly known as the CCITT). Group supported by the United Nations that makes recommendations and coordinates the development of telecommunications standards for the entire world.