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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  TCP/IP Routing Protocols (Gateway Protocols)
                9  TCP/IP Interior Routing Protocols (RIP, OSPF, GGP, HELLO, IGRP, EIGRP)
                     9  TCP/IP Routing Information Protocol (RIP, RIP-2 and RIPng)
                          9  RIP Version-Specific Message Formats and Features

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RIP Version 1 (RIP-1) Message Format
(Page 1 of 3)

RIP evolved as an industry standard and was popularized by its inclusion in the Berkeley Standard Distribution of UNIX (BSD UNIX). This first version of RIP (now sometimes called RIP-1 to differentiate it from later versions), was eventually standardized in RFC 1058. As part of this standard the original RIP-1 message format was defined, which of course serves RIP-1 itself, and is also the basis for the format used in later versions.

RIP-1 Messaging

As explained in the general discussion on RIP operation, route information is exchanged in RIP through the sending of two different types of RIP messages: RIP Request and the RIP Response. These are transmitted as regular TCP/IP messages using the User Datagram Protocol (UDP), using UDP reserved port number 520. This port number is used as follows:

  • RIP Request messages are sent to UDP destination port 520. They may have a source port of 520 or may use an ephemeral port number.

  • RIP Response messages sent in reply to an RIP Request are sent with a source port of 520, and a destination port equal to whatever source port the RIP Request used.

  • Unsolicited RIP Response messages (sent on a routine basis and not in response to a request) are sent with both the source and destination ports set to 520.

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Version 3.0 - Version Date: September 20, 2005

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