Routing Protocols and Concepts: Ch5 - Routing Information Protocol (RIP v1)

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Routing Information Protocol Version 1 (RIPv1) history and characteristics.
RIP v1 message format.
RIP Request / Response Process.
IP Address Classes and Classful Routing.
RIP v1 Configuration, Router RIP command, Network command, Show IP Route, debug IP RIP and Show ip protocols.
Passive Interfaces, Boundary Routers and Automatic Summarization.
Advantages and Disadvantages of automatic summarization.
Processing RIP Updates, Default Route and RIPv1

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Routing Protocols and Concepts: Ch5 - Routing Information Protocol (RIP v1)

  1. 1. Routing Protocols and Concepts Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  2. 2. • If you see any mistake’s’ on my PowerPoint slides or if you have any other questions or comments, please feel free to email me at abdu.elsaid@yahoo.com. Thanks! Abdelkhalik Elsaid Mousa FCI – SCU - Egypt Cisco Networking Academy Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  3. 3. • GWINFO (Mid 1970 Xerox), RIP (XNS BSD), RIP V1(RFC 1988), RIP V2(1994), RIP ng(1997)• RIP is a distance vector routing protocol.• Metric: hop count, Advertised routes with metric > 15 are unreachable.• Messages are periodic and broadcast every 30 seconds. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  4. 4. Application Command Version Address Family Identifier IP Metric Transport Dest. port Src. port Data Internet Protocol Dest. IP Src. IP UDP DatagramNetwork Access Dest. MAC Src. MAC Packet Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  5. 5. • On startup, The router requests the full routing table.• A response message is sent back by RIP-enabled neighbors.• The startup router then sends a triggered update out all RIP- enabled interfaces containing its own routing table. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  6. 6. • RIP v1 is a classful routing protocol.• So, a router either uses the subnet mask configured on a local interface, or applies the default subnet mask.• RIPv1 networks cannot be discontiguous nor can support VLSM. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  7. 7. • AD is the trustworthiness (or preference) of the route source.• RIP AD is 120. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
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  9. 9. does not start RIP process. It provides access to configure the routing protocol.Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
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  14. 14. • Unnecessary RIP Updates Impact Network 1. Bandwidth is wasted transporting unnecessary updates. 2. All LAN devices process the update up to Transport layers. 3. Advertising updates on a broadcast network is a security risk.• Stopping Unnecessary RIP Updates: R2(config-router)#passive-interface f0/0. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  15. 15. On certification exams, entering a subnet address instead of the classful network address in a network command is considered an incorrect answer.Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  16. 16. • Boundary Router: is a router that has interfaces in more than one major classful network.• RIP is a classful routing protocol that automatically summarizes classful networks across major network boundaries. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  17. 17. • The following two rules govern RIPv1 updates: IF a routing update and the interface on which it is received belong to the same major network THEN the subnet mask of the interface is applied to the network in the update ELSE the classful subnet mask of the network is applied. Debug ip rip Debug ip routingRouters running RIPv1 are limited to using the same subnet mask for all subnets with the same classful network Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  18. 18. • Advantages of Automatic Summarization 1. Conserve bandwidth, smaller routing updates sent & received. 2. Minimized routing table and then faster lookup. 3. Stability in routing table.• Disadvantages of Automatic Summarization 1. Does not support discontiguous networks. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
  19. 19. R2 has two equal-cost paths to the 172.30.0.0 networkR1 does not have any routes to the LANs attached to R3 R3 does not have any routes to the LANs attached to R1 Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
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