IGRP is a distance-vector interior gateway protocol (IGP). Distance-vector routing protocols call for each router to send all or a portion of its routing table in a routing-update message at regular intervals to each of its neighboring routers.
Technology Information
Technology Q&A
(All IP Routing Technology Q&A)
Technology White Paper
(All IP Routing Technology White Paper)
(All IP Routing Technology Q&A)
Technology White Paper
(All IP Routing Technology White Paper)
Design
Design TechNotes
(All IP Routing Design TechNotes)
(All IP Routing Design TechNotes)
Behavior of RIP and IGRP When Sending and Receiving Updates
How Does Load Balancing Work?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
How Split Horizon Affects RIP/IGRP Routing Updates when Secondary Addresses Are Involved
IP Addressing and Subnetting for New Users
Route Selection in Cisco Routers
Route-Maps for IP Routing Protocol Redistribution Configuration
Specifying a Next Hop IP Address for Static Routes
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Is Administrative Distance?
When Are ICMP Redirects Sent?
Why Doesn't RIP or IGRP Support Discontiguous Networks?
Why Don't RIPv1 and IGRP Support Variable-Length Subnet Mask?
How Does Load Balancing Work?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
How Split Horizon Affects RIP/IGRP Routing Updates when Secondary Addresses Are Involved
IP Addressing and Subnetting for New Users
Route Selection in Cisco Routers
Route-Maps for IP Routing Protocol Redistribution Configuration
Specifying a Next Hop IP Address for Static Routes
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Is Administrative Distance?
When Are ICMP Redirects Sent?
Why Doesn't RIP or IGRP Support Discontiguous Networks?
Why Don't RIPv1 and IGRP Support Variable-Length Subnet Mask?
Configure
Configuration Examples and TechNotes
(All IP Routing Configuration Examples and TechNotes)
(All IP Routing Configuration Examples and TechNotes)
Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example
Configuring a Gateway of Last Resort Using IP Commands
Filtering Routing Updates on Distance Vector IP Routing Protocols
Host and Subnet Quantities
IGRP Metric
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP
Redistributing Routing Protocols
Understanding Policy Routing
Configuring a Gateway of Last Resort Using IP Commands
Filtering Routing Updates on Distance Vector IP Routing Protocols
Host and Subnet Quantities
IGRP Metric
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP
Redistributing Routing Protocols
Understanding Policy Routing
Troubleshoot and Alerts
Troubleshooting TechNotes
(All IP Routing Troubleshooting TechNotes)
(All IP Routing Troubleshooting TechNotes)
Behavior of RIP and IGRP When Sending and Receiving Updates
Configuring a Gateway of Last Resort Using IP Commands
Filtering Routing Updates on Distance Vector IP Routing Protocols
Host and Subnet Quantities
How Does Load Balancing Work?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
How Split Horizon Affects RIP/IGRP Routing Updates when Secondary Addresses Are Involved
IGRP Metric
IP Addressing and Subnetting for New Users
OSPF and EIGRP Neighbor Loss, RIP and IGRP Update Loss after Upgrading to Cisco IOS 11.2 or Later
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP
Redistributing Routing Protocols
Route Selection in Cisco Routers
Route-Maps for IP Routing Protocol Redistribution Configuration
Specifying a Next Hop IP Address for Static Routes
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Is Administrative Distance?
When Are ICMP Redirects Sent?
Why Doesn't RIP or IGRP Support Discontiguous Networks?
Why Don't RIPv1 and IGRP Support Variable-Length Subnet Mask?
Configuring a Gateway of Last Resort Using IP Commands
Filtering Routing Updates on Distance Vector IP Routing Protocols
Host and Subnet Quantities
How Does Load Balancing Work?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
How Split Horizon Affects RIP/IGRP Routing Updates when Secondary Addresses Are Involved
IGRP Metric
IP Addressing and Subnetting for New Users
OSPF and EIGRP Neighbor Loss, RIP and IGRP Update Loss after Upgrading to Cisco IOS 11.2 or Later
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP
Redistributing Routing Protocols
Route Selection in Cisco Routers
Route-Maps for IP Routing Protocol Redistribution Configuration
Specifying a Next Hop IP Address for Static Routes
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Is Administrative Distance?
When Are ICMP Redirects Sent?
Why Doesn't RIP or IGRP Support Discontiguous Networks?
Why Don't RIPv1 and IGRP Support Variable-Length Subnet Mask?
