It was invented by Cisco. IGRP manages the flow of routing information within connected routers in the host network or autonomous system. The protocol ensures that every router has routing tables updated with the best available path. IGRP also avoids routing loops by updating itself with the changes occurring over the network and by error management. IGRP supports a maximum hop count of up to The primary two purposes of IGRP are to:. IGRP sends a notification of any new changes, and information about its status, to its neighbors every 90 seconds.
IGRP manages a routing table with the most optimal path to respective nodes and to networks within the parent network. Please be aware that we are not responsible for the privacy practices of such other sites.
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All rights reserved. Cisco Press. Join Sign In. Date: Dec 12, Uses IP protocol 9. Classful protocol no support for CIDR. No support for VLSMs. Composite metric using bandwidth and delay by default. You can include load and reliability in the metric. Route updates sent every 90 seconds. Hop count limited to by default, configurable to up to No support for authentication. Implements split horizon with poison reverse.
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The bandwidth number may be changed from the default with the bandwidth command. Router config-if bandwidth? So if we take the bandwidth we have configured on the interface, Kb, and use the formal we will work out what EIGRP will calculate the interface bandwidth at;.
Delay , like bandwidth, is a static figure and is not measured dynamically. The default delay of an interface may be changed with the delay command, which specifies the delay in tens of microseconds. Router config-if delay? So if we take the delay we have configured on the interface, microseconds, and use the formal we will work out what EIGRP will calculate the interface delay at;. IGRP uses bandwidth and delay as its default metrics, these quantities must be configured correctly and consistently on all interfaces of all IGRP routers.
It is important to note that OSPF also uses the bandwidth statement to calculate its metric. Reliability is measured dynamically and is expressed as an eight-bit number, where is a percent reliable link and 1 is a minimally reliable link. Load is represented as a fraction of , 1 is a minimally loaded link, and is a percent loaded link.
If reliability or load is to be used as a metric or as part of a composite metric, the algorithm for calculating the metric must not allow sudden changes in the error rate or channel occupancy to destabilize the network. To do so, just open the Adblock menu and select "Disable on tcpipguide. Or go to the Tools menu and select "Adblock Plus Preferences Then click "Add Filter Then just click OK.
In IGRP, the overall cost to reach a network is computed based on several individual metrics, including internetwork delay, bandwidth, reliability and load. The calculation of cost can be customized by an administrator, who can set relative weightings to the component metrics to reflect the priorities of that autonomous system. So, if a particular administrator feels route cost would be best minimized by emphasizing reliability over bandwidth, he or she can do this.
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