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.
– More scalable than RIP
– Sophisticated metric
– Multiple-path support
IGRP Composite Metric
– Bandwidth
– Delay
– Reliability
– Loading
– MTU
IGRP Unequal Multiple Paths
– Maximum 6 paths (default = 4)
– Within metric variance
– Next-hop router closer to destination
Configuring IGRP
IGRP Configuration Example
debug ip igrp transaction Command