Routing basics
Upcoming SlideShare
Loading in...5
×
 

Like this? Share it with your network

Share

Routing basics

on

  • 1,190 views

Seminar on IP Routing protocols with simulations using Cisco Packet Tracer.

Seminar on IP Routing protocols with simulations using Cisco Packet Tracer.

Statistics

Views

Total Views
1,190
Views on SlideShare
1,179
Embed Views
11

Actions

Likes
0
Downloads
34
Comments
0

2 Embeds 11

http://www.linkedin.com 10
https://www.linkedin.com 1

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Routing basics Presentation Transcript

  • 1. ROUTING PROTOCOLS Narendran Thangarajan, @naren_live SSN College of Engineering, Chennai.
  • 2. RECAP..  MAIN CLASSIFICATION  STATIC ROUTING  DYNAMIC ROUTING  Concept of Autonomous System (AS)  What is dynamic in Dynamic Routing Protocols?
  • 3. RECAP – Dynamic Routing Protocols  Dynamic Routing Classification  IntraDomain  Distance Vector  Link State  InterDomain  Path Vector
  • 4. RECAP – Distance Vector Routing Distance Vectors shared Initialization – directly connected routers Sharing – Share the first two columns of the routing table Updating – Better cost replaces old entry When to share? – Periodic and triggered Problems Eg: RIP
  • 5. LINK STATE ROUTING Goal : To find the shortest path to the destination. Difference from DV : In DV each router knows only the next hop. But in LS each router has the entire topology of the domain.
  • 6. Steps: Initial State : All routers know their own link state. Creation of LSPs Reliable Flooding of LSPs Formation of Shortest Path Tree Routing Table Calculation
  • 7. Creating LSP Link State Packets (LSP) carry large amount of information. Also called Hello Packets. Important Fields : Router ID, Link state of the router, Sequence number, Time to Live. Created on two occasions:  When there is change in the topology.  Periodic basis.
  • 8. Reliable Flooding ALL nodes broadcast their LSPs to their adjacent nodes. Depending upon the sequence number and the link state values, the receiving node decides whether to discard or store the LSP.
  • 9. Formation of Shortest Path tree  After the LSP are shared among all nodes, each and every node has the entire topology of the domain.  Then Dijkstra’s algorithm is run over this information to create a shortest path tree from the graph obtained.  Permanent List and Tentative list – An eg. Problem  Demo - http://www.ifors.ms.unimelb.edu.au/tutorial/dijkstra /island.html
  • 10. Creation of routing table From the generated shortest paths, the routing table is generated. In both DV and LS, the final routing table is the same. The difference lies only in the way the routing table is prepared.
  • 11. OSPF – Open Shortest Path First  The Autonomous System is divided into Areas.  LS routing protocol runs inside an Area.  The summary of the routing information is given to the Backbone area through ABR.
  • 12. Simulations
  • 13. Thank you 