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Interior Gateway Routing Protocol (IGRP)

Interior Gateway Routing Protocol (IGRP) is a kind of IGP which is a distance-vector routing protocol invented by Cisco, used by routers to exchange routing data within an autonomous system.

IGRP– More scalable than RIP
– Sophisticated metric
– Multiple-path support

IGRP Composite Metric

IGRP– Bandwidth
– Delay
– Reliability
– Loading
– MTU

IGRP Unequal Multiple Paths
IGRP
– Maximum 6 paths (default = 4)
– Within metric variance
– Next-hop router closer to destination

Configuring IGRP

IGRP
IGRP Configuration Example

IGRP
debug ip igrp transaction Command
IGRP