
6
Configuring Routing
254
Voyager Reference Guide
IGRP (Inter-Gateway Routing Protocol)
IGRP Description
The
Inter-Gateway Routing Protocol (IGRP)
is a widely used interior
gateway protocol (IGP). Like RIP, IGRP is an implementation of a distance-
vector, or Bellman-Ford, routing protocol for local networks. As specified,
IGRP modifies the basic Bellman-Ford algorithm in three ways:
!
Uses a vector of metrics.
!
Allows for multiple paths to a single destination, thus allowing for load
sharing.
!
Provides stability during topology changes due to new features.
This document provides background information and cites differences with
other IGRP implementations.
A router running IGRP broadcasts routing updates at periodic intervals, in
addition to updates that are sent immediately in response to some type of
topology change. An update message includes the following information:
!
Configured autonomous system number
!
Current edition number of the routing table
!
Checksum of the update message
!
Count of the number of routes included
!
List of route entries
There are three types of route entries in an IGRP update packet:
!
Interior
!
System
!
Exterior
Содержание Network Voyager
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Страница 30: ...2 How to Use Voyager 30 Voyager Reference Guide ...
Страница 32: ...3 Command Line Utility Files 32 Voyager Reference Guide ...
Страница 220: ...5 Configuring Interfaces 220 Voyager Reference Guide ...
Страница 446: ...7 Configuring Traffic Management 448 Voyager Reference Guide ...
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Страница 618: ...10 Configuring Security and Access 620 Voyager Reference Guide ...
Страница 668: ...14 Configuring IPv6 670 Voyager Reference Guide ...
Страница 672: ...15 IPSO Process Management 674 Voyager Reference Guide ...
Страница 700: ...Index 702 Voyager Reference Guide ...