Enhanced IGRP provides compatibility and seamless interoperation with IGRP routers. An automatic-redistribution mechanism allows IGRP routes to be imported into Enhanced IGRP, and vice versa, so it is possible to add Enhanced IGRP gradually into an existing IGRP network.
Technology Information
Technology Briefs
(All IP Routing Technology Briefs)
(All IP Routing Technology Q&A)
Technology White Paper
(All IP Routing Technology White Paper)
(All IP Routing Technology Briefs)
Advances in EIGRP
(PPT - 2 MB)
Cisco IOS EIGRP For Managed Services Basic Operations and Protocol Characterics
(PDF - 77 KB)
Cisco IOS EIGRP in Managed Services Site-of-Origin Support (PDF - 380 KB)
Configuring Cisco IOS EIGRP in Managed Services (PDF - 280 KB)
EIGRP For Managed Services Functionality Presentation (PPT - 2 MB)
EIGRP For Managed Services Technology Deployment (PPT - 3 MB)
Technology Q&A (PPT - 2 MB)Cisco IOS EIGRP For Managed Services Basic Operations and Protocol Characterics
(PDF - 77 KB)Cisco IOS EIGRP in Managed Services Site-of-Origin Support
(PDF - 380 KB)Configuring Cisco IOS EIGRP in Managed Services
(PDF - 280 KB)EIGRP For Managed Services Functionality Presentation
(PPT - 2 MB)EIGRP For Managed Services Technology Deployment
(PPT - 3 MB)(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)
How Does Load Balancing Work?
How Does the Passive Interface Feature Work in EIGRP?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
Introduction to EIGRP
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 IPX-EIGRP
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Is Administrative Distance?
When Are ICMP Redirects Sent?
How Does the Passive Interface Feature Work in EIGRP?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
Introduction to EIGRP
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 IPX-EIGRP
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Is Administrative Distance?
When Are ICMP Redirects Sent?
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
Configuration Notes for the Implementation of EIGRP over Frame Relay and Low Speed Links
Configuring a Gateway of Last Resort Using IP Commands
Configuring IPSec with EIGRP and IPX Using GRE Tunneling
DMVPN to FlexVPN Soft Migration Configuration Example
EIGRP IPv6 Configuration Example
EIGRP Message Authentication Configuration Example
EIGRP on SVTI, DVTI, and IKEv2 FlexVPN with the "IP[v6] Unnumbered" Command Configuration Example
Failover with EIGRP Using VRF Configuration Example
Filtering Routing Updates on Distance Vector IP Routing Protocols
FlexVPN Migration: Hard Move from DMVPN to FlexVPN on a Different Hub
GRE over IPSec with EIGRP to Route Through a Hub and Multiple Remote Sites Configuration Example
Host and Subnet Quantities
Mutual Redistribution Between EIGRP and BGP Configuration Example
Redistribute IPv6 BGP Default Route in EIGRPv6 Configuration Example
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP
Redistributing Routing Protocols
Setting a Preferred Route by Influencing EIGRP Metrics
Understanding IPX-EIGRP
Understanding Policy Routing
What Do EIGRP "Not On Common Subnet" Messages Mean?
Configuration Notes for the Implementation of EIGRP over Frame Relay and Low Speed Links
Configuring a Gateway of Last Resort Using IP Commands
Configuring IPSec with EIGRP and IPX Using GRE Tunneling
DMVPN to FlexVPN Soft Migration Configuration Example
EIGRP IPv6 Configuration Example
EIGRP Message Authentication Configuration Example
EIGRP on SVTI, DVTI, and IKEv2 FlexVPN with the "IP[v6] Unnumbered" Command Configuration Example
Failover with EIGRP Using VRF Configuration Example
Filtering Routing Updates on Distance Vector IP Routing Protocols
FlexVPN Migration: Hard Move from DMVPN to FlexVPN on a Different Hub
GRE over IPSec with EIGRP to Route Through a Hub and Multiple Remote Sites Configuration Example
Host and Subnet Quantities
Mutual Redistribution Between EIGRP and BGP Configuration Example
Redistribute IPv6 BGP Default Route in EIGRPv6 Configuration Example
Redistributing Between Classful and Classless Protocols: EIGRP or OSPF into RIP or IGRP
Redistributing Routing Protocols
Setting a Preferred Route by Influencing EIGRP Metrics
Understanding IPX-EIGRP
Understanding Policy Routing
What Do EIGRP "Not On Common Subnet" Messages Mean?
Troubleshoot and Alerts
Security Advisories, Responses and Notices
(All IP Routing Security Advisories, Responses and Notices)
(All IP Routing Troubleshooting TechNotes)
(All IP Routing Security Advisories, Responses and Notices)
Cisco Security Notice: Cisco's Response to the EIGRP Issue
Cisco Security Notice: Response to BugTraq - Cisco EIGRP Issue
Troubleshooting TechNotesCisco Security Notice: Response to BugTraq - Cisco EIGRP Issue
(All IP Routing Troubleshooting TechNotes)
Configuration Notes for the Implementation of EIGRP over Frame Relay and Low Speed Links
Configuring a Gateway of Last Resort Using IP Commands
EIGRP on SVTI, DVTI, and IKEv2 FlexVPN with the "IP[v6] Unnumbered" Command Configuration Example
Filtering Routing Updates on Distance Vector IP Routing Protocols
Host and Subnet Quantities
How Does Load Balancing Work?
How Does the Passive Interface Feature Work in EIGRP?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
Introduction to EIGRP
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
Preventing Duplicate EIGRP Router IDs
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
Setting a Preferred Route by Influencing EIGRP Metrics
Specifying a Next Hop IP Address for Static Routes
The "%TUN-5-RECURDOWN" Error Message and Flapping EIGRP/OSPF/BGP Neighbors Over a GRE Tunnel
Troubleshooting EIGRP
Understanding IPX-EIGRP
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Does the EIGRP DUAL-3-SIA Error Message Mean?
What Is Administrative Distance?
When Are ICMP Redirects Sent?
Configuring a Gateway of Last Resort Using IP Commands
EIGRP on SVTI, DVTI, and IKEv2 FlexVPN with the "IP[v6] Unnumbered" Command Configuration Example
Filtering Routing Updates on Distance Vector IP Routing Protocols
Host and Subnet Quantities
How Does Load Balancing Work?
How Does the Passive Interface Feature Work in EIGRP?
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
Introduction to EIGRP
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
Preventing Duplicate EIGRP Router IDs
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
Setting a Preferred Route by Influencing EIGRP Metrics
Specifying a Next Hop IP Address for Static Routes
The "%TUN-5-RECURDOWN" Error Message and Flapping EIGRP/OSPF/BGP Neighbors Over a GRE Tunnel
Troubleshooting EIGRP
Understanding IPX-EIGRP
Understanding Policy Routing
Using the Extended ping and Extended traceroute Commands
What Does the EIGRP DUAL-3-SIA Error Message Mean?
What Is Administrative Distance?
When Are ICMP Redirects Sent?
