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IGRP is a distance vector Interior
Gateway Protocol (IGP). Distance vector routing protocols mathematically
compare routes by measuring distances. This measurement is known as the
distance vector. Routers using distance vector protocols must send all
or a portion of their routing table in a routing update message at
regular intervals to each of their neighboring routers. As routing
information spreads throughout the network, routers perform the
following functions:
- Identify new destinations
- Learn of failures
IGRP is a distance vector routing
protocol developed by Cisco. IGRP sends routing updates at 90 second
intervals, advertising networks for a particular autonomous system. Key
design characteristics of IGRP are a follows:
- The versatility to automatically
handle indefinite, complex topologies
- The flexibility needed to segment with
different bandwidth and delay characteristics
- Scalability for functioning in very
large networks
By default, the IGRP routing protocol
uses bandwidth and delay as metrics.
Additionally, IGRP can be configured to use a combination of variables
to determine a composite metric. Those variables include:
- Bandwidth
- Delay
- Load
- Reliability
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Interactive Media Activity
Checkbox: RIP versus IGRP
After completing this activity, the student will be able to understand RIP
and IGRP.
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