Basic HTML version of Foils prepared Dec. 6 98

Foil 41 Enhanced IGRP (1)

From Introduction to Network Security Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 Replaced its predecessor IGRP in early 1990s (by Cisco Systems)
2 Integrates capabilities of link-state protocol into distance-vector protocols
3 Incorporates Diffusing Update Algorithm (DUAL)
4 E-IGRP inter-operates with older IGPR routers and consumes less bandwidth than IGRP routers
5 E-IGRP supports
  • partial updates ( no periodic updates; only for routers that need info; only when the metric for a route changes)
  • multiple network layer protocols (IP, Appletalk, NetWare; for IP: implementation rebuilds routes learned from OSPF, RIP, IS-IS, EGP, BGP)
  • variable-length subnet mask
  • fast convergence (E-IGRP router stores all its neighboring tables)
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