Telematics Chapter 6: Network Layer - Freie Universität Berlin

Routing Information Protocol (RIP)
● Routing Information Protocol (RIP,
RFC 1058)
● Early internal gateway routing
protocol used in the Internet
● Based on the Distance Vector Protocol
● RIP messages are sent every 30
seconds as UDP datagrams
● Used metric for the evaluation of the
paths is the number of hops
● The maximum number of hops is
limited to 15 � 16 = ∞
● In a message (only) up to 25 entries
of the routing table can be sent
● Fits good for small systems
● Problems:
● Slow convergence (duration of
minutes)
● Count to Infinity
● No considering of subnets
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer
● RIPv2 (RFC 2453):
● Subnets, CIDR
● Authentication
● Multicast, etc.
● However: max. number of hops is still
limited to 15
● RIPng (RFC 2080)
● IPv6 support
● Internet Gateway Routing Protocol
(IGRP)
● As reaction to the restrictions of RIP
Cisco introduced IGRP
● Extension of the metric, load sharing,
more efficient packet format
● The protocols did not become
generally accepted, because they
were Cisco specific
● Replaced by EIGRP (new design)
● Replacement by a Link State
Protocol (OSPF)
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