Interior Gateway Routing Protocol

related topics
{system, computer, user}
{math, number, function}
{line, north, south}
{school, student, university}

Interior Gateway Routing Protocol (IGRP) is a distance vector interior routing protocol (IGP) invented by Cisco. It is used by routers to exchange routing data within an autonomous system.

IGRP is a proprietary protocol. IGRP was created in part to overcome the limitations of RIP (maximum hop count of only 15, and a single routing metric) when used within large networks. IGRP supports multiple metrics for each route, including bandwidth, delay, load, MTU, and reliability; to compare two routes these metrics are combined together into a single metric, using a formula which can be adjusted through the use of pre-set constants. The maximum hop count of IGRP-routed packets is 255 (default 100), and routing updates are broadcast every 90 seconds (by default).[1]

IGRP is considered a classful routing protocol. Because the protocol has no field for a subnet mask, the router assumes that all interface addresses within the same Class A, Class B, or Class C network have the same subnet mask as the subnet mask configured for the interfaces in question. This contrasts with classless routing protocols that can use variable length subnet masks. Classful protocols have become less popular as they are wasteful of IP address space.

BGP · DHCP · DNS · FTP · HTTP · IMAP · IRC · LDAP · MGCP · NNTP · NTP · POP · RIP · RPC · RTP · SIP · SMTP · SNMP · SSH · Telnet · TLS/SSL · XMPP ·

Full article ▸

related documents
Inter-process communication
Fractal transform
Presentation Layer
Microphone array
EDVAC
Session Description Protocol
Electronic Delay Storage Automatic Calculator
Intel 80186
Fsck
Intel 8008
Fiber distributed data interface
SAPHIRE
Vertical interval timecode
Fluent, Inc.
Edlin
ICab
Handshaking
Java Data Objects
Applesoft BASIC
GEGL
Low-power communication device
Risc PC
Automatic number announcement circuit
Freescale DragonBall
Back Orifice 2000
Reduced-carrier transmission
Information technology
Wikipedia:Federal Standard 1037C terms/computer hardware terms
IBM System p
Transatlantic telephone cable