Routing protocol : Notes
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Routing protocols enable routers to communicate and share information to select optimal paths for data packets across networks. They adapt dynamically to network changes, ensuring fault tolerance and high availability. Key classifications include interior gateway protocols and exterior gateway protocols, with specific examples like OSPF and BGP.
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Routing protocol
A routing protocol specifies how routers communicate with each other to distribute information
that enables them to select routes between any two nodes on a computer network. Routers perform
the "traffic directing" functions on the Internet; data packets are forwarded through the networks of
the internet from router to router until they reach their destination computer. Routing algorithms
determine the specific choice of route. Each router has a prior knowledge only of networks attached
to it directly. A routing protocol shares this information first among immediate neighbors, and then
throughout the network. This way, routers gain knowledge of the topology of the network. The ability
of routing protocols to dynamically adjust to changing conditions such as disabled data lines and
computers and route data around obstructions is what gives the Internet its fault tolerance and high
availability.
The specific characteristics of routing protocols include the manner in which they avoid routing
loops, the manner in which they select preferred routes, using information about hop costs, the time
they require to reach routing convergence, their scalability, and other factors such as relay
multiplexing and cloud access framework parameters. Certain additional characteristics such as
multilayer interfacing may also be employed as a means of distributing uncompromised networking
gateways to authorized ports.[1] This has the added benefit of preventing issues with routing protocol
loops.[2]
Many routing protocols are defined in technical standards documents called RFCs.[3][4][5][6]
Types
OSI layer designation
Interior gateway protocols
Exterior gateway protocols
Routing software
Routed protocols
See also
Notes
References
Further reading
Although there are many types of routing protocols, three major classes are in widespread use on IP
networks:
Interior gateway protocols type 1, link-state routing protocols, such as OSPF and IS-IS
Interior gateway protocols type 2, distance-vector routing protocols, such as Routing Information
Protocol, RIPv2, IGRP.
Contents
Types](https://image.slidesharecdn.com/routingprotocol-wikipedia-201025171442/85/Routing-protocol-Notes-1-320.jpg)
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Exterior gateway protocols are routing protocols used on the Internet for exchanging routing
information between Autonomous Systems, such as Border Gateway Protocol (BGP), a path-
vector routing protocol. Exterior gateway protocols should not be confused with Exterior Gateway
Protocol (EGP), an obsolete routing protocol.
Routing protocols, according to the OSI routing framework, are layer management protocols for the
network layer, regardless of their transport mechanism:
IS-IS runs on the data link layer (Layer 2)
Open Shortest Path First (OSPF) is encapsulated in IP, but runs only on the IPv4 subnet, while
the IPv6 version runs on the link using only link-local addressing.
IGRP, and EIGRP are directly encapsulated in IP. EIGRP uses its own reliable transmission
mechanism, while IGRP assumed an unreliable transport.
Routing Information Protocol (RIP) runs over the User Datagram Protocol (UDP). Version 1
operates in broadcast mode, while version 2 uses multicast addressing.
BGP runs over the Transmission Control Protocol (TCP).
Interior gateway protocols (IGPs) exchange routing information within a single routing domain.
Examples of IGPs include:
Open Shortest Path First (OSPF)
Routing Information Protocol (RIP)
Intermediate System to Intermediate System (IS-IS)
Enhanced Interior Gateway Routing Protocol (EIGRP)[a]
Exterior gateway protocols exchange routing information between autonomous systems. Examples
include:
Exterior Gateway Protocol (EGP)
Border Gateway Protocol (BGP)
Many software implementations exist for most of the common routing protocols. Examples of open-
source applications are Bird Internet routing daemon, Quagga, GNU Zebra, OpenBGPD,
OpenOSPFD, and XORP.
Some network certification courses distinguish between routing protocols and routed protocols. A
routed protocol is used to deliver application traffic. It provides appropriate addressing
information in its internet layer or network layer to allow a packet to be forwarded from one network
to another. Examples of routed protocols are the Internet Protocol (IP) and Internetwork Packet
Exchange (IPX).
OSI layer designation
Interior gateway protocols
Exterior gateway protocols
Routing software
Routed protocols](https://image.slidesharecdn.com/routingprotocol-wikipedia-201025171442/85/Routing-protocol-Notes-2-320.jpg)
Routing protocol : Notes
- 1. 10/25/2020 Routing protocol - Wikipedia https://en.wikipedia.org/wiki/Routing_protocol 1/3 Routing protocol A routing protocol specifies how routers communicate with each other to distribute information that enables them to select routes between any two nodes on a computer network. Routers perform the "traffic directing" functions on the Internet; data packets are forwarded through the networks of the internet from router to router until they reach their destination computer. Routing algorithms determine the specific choice of route. Each router has a prior knowledge only of networks attached to it directly. A routing protocol shares this information first among immediate neighbors, and then throughout the network. This way, routers gain knowledge of the topology of the network. The ability of routing protocols to dynamically adjust to changing conditions such as disabled data lines and computers and route data around obstructions is what gives the Internet its fault tolerance and high availability. The specific characteristics of routing protocols include the manner in which they avoid routing loops, the manner in which they select preferred routes, using information about hop costs, the time they require to reach routing convergence, their scalability, and other factors such as relay multiplexing and cloud access framework parameters. Certain additional characteristics such as multilayer interfacing may also be employed as a means of distributing uncompromised networking gateways to authorized ports.[1] This has the added benefit of preventing issues with routing protocol loops.[2] Many routing protocols are defined in technical standards documents called RFCs.[3][4][5][6] Types OSI layer designation Interior gateway protocols Exterior gateway protocols Routing software Routed protocols See also Notes References Further reading Although there are many types of routing protocols, three major classes are in widespread use on IP networks: Interior gateway protocols type 1, link-state routing protocols, such as OSPF and IS-IS Interior gateway protocols type 2, distance-vector routing protocols, such as Routing Information Protocol, RIPv2, IGRP. Contents Types
- 2. 10/25/2020 Routing protocol - Wikipedia https://en.wikipedia.org/wiki/Routing_protocol 2/3 Exterior gateway protocols are routing protocols used on the Internet for exchanging routing information between Autonomous Systems, such as Border Gateway Protocol (BGP), a path- vector routing protocol. Exterior gateway protocols should not be confused with Exterior Gateway Protocol (EGP), an obsolete routing protocol. Routing protocols, according to the OSI routing framework, are layer management protocols for the network layer, regardless of their transport mechanism: IS-IS runs on the data link layer (Layer 2) Open Shortest Path First (OSPF) is encapsulated in IP, but runs only on the IPv4 subnet, while the IPv6 version runs on the link using only link-local addressing. IGRP, and EIGRP are directly encapsulated in IP. EIGRP uses its own reliable transmission mechanism, while IGRP assumed an unreliable transport. Routing Information Protocol (RIP) runs over the User Datagram Protocol (UDP). Version 1 operates in broadcast mode, while version 2 uses multicast addressing. BGP runs over the Transmission Control Protocol (TCP). Interior gateway protocols (IGPs) exchange routing information within a single routing domain. Examples of IGPs include: Open Shortest Path First (OSPF) Routing Information Protocol (RIP) Intermediate System to Intermediate System (IS-IS) Enhanced Interior Gateway Routing Protocol (EIGRP)[a] Exterior gateway protocols exchange routing information between autonomous systems. Examples include: Exterior Gateway Protocol (EGP) Border Gateway Protocol (BGP) Many software implementations exist for most of the common routing protocols. Examples of open- source applications are Bird Internet routing daemon, Quagga, GNU Zebra, OpenBGPD, OpenOSPFD, and XORP. Some network certification courses distinguish between routing protocols and routed protocols. A routed protocol is used to deliver application traffic. It provides appropriate addressing information in its internet layer or network layer to allow a packet to be forwarded from one network to another. Examples of routed protocols are the Internet Protocol (IP) and Internetwork Packet Exchange (IPX). OSI layer designation Interior gateway protocols Exterior gateway protocols Routing software Routed protocols
- 3. 10/25/2020 Routing protocol - Wikipedia https://en.wikipedia.org/wiki/Routing_protocol 3/3 Static routing Dynamic routing Hierarchical state routing Optimized Link State Routing Protocol B.A.T.M.A.N. a. Cisco no longer supports the proprietary IGRP protocol. The EIGRP implementation accepts IGRP configuration commands, but the internals of IGRP and EIGRP are different. 1. Ahmad, F (2016). "Machine-to-machine sensor data multiplexing using LTE-advanced relay node for logistics". Dynamics in Logistics. 2. Garnepudi, P (2013). "Proactive, reactive and hybrid multicast routing protocols for Wireless Mesh Networks". IEEE International Conference on Computational Intelligence and Computing Research. 3. INTERNET PROTOCOL (ftp://ftp.rfc-editor.org/in-notes/rfc791.txt), RFC 791, J Postel, September 1981. 4. BROADCASTING INTERNET DATAGRAMS IN THE PRESENCE OF SUBNETS (ftp://ftp.rfc-edit or.org/in-notes/rfc922.txt), RFC 922, Jeffrey Mogul, October 1984 5. Towards Requirements for IP Routers (ftp://ftp.rfc-editor.org/in-notes/rfc1716.txt), RFC 1716, P. Almquist, November 1994 6. Requirements for IP Version 4 Routers (ftp://ftp.rfc-editor.org/in-notes/rfc1812.txt), RFC 1812, F. Baker,June 1995 Chapter "Routing Basics" (http://docwiki.cisco.com/wiki/Internetworking_Technology_Handbook) in the Cisco "Internetworking Technology Handbook" Retrieved from "https://en.wikipedia.org/w/index.php?title=Routing_protocol&oldid=975796547" This page was last edited on 30 August 2020, at 13:22 (UTC). Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. See also Notes References Further reading