Is Is Routing Protocol

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Is Is Routing Protocol

  1. 1. By SHUBHAM SAHRMA FINAL YEAR(CS) [email_address]
  2. 2. IGP –> IS-IS <ul><li>Distance Vector IGP’s </li></ul><ul><ul><li>RIP </li></ul></ul><ul><ul><li>RIP2 </li></ul></ul><ul><ul><li>IGRP </li></ul></ul><ul><ul><li>EIGRP </li></ul></ul><ul><li>Link State IGP’s </li></ul><ul><ul><li>OSPF </li></ul></ul><ul><ul><li>IS/IS </li></ul></ul>
  3. 3. CAN’T WORK ACROSS AUTONOMOUS SYSTEM <ul><li>An autonomous system can be defined as group of router under the same administrative control. </li></ul><ul><li>Protocols like BGP can work across the autonomous system basically called as EGP(Exterior Gateway Protocol). </li></ul>
  4. 4. IGP – IS/IS <ul><li>OSI Developed </li></ul><ul><li>In the magic OSI fantasy world everything is either an End System (ES) or an Intermediate System (IS.) </li></ul><ul><li>ES=Hosts </li></ul><ul><li>IS=Routers </li></ul><ul><li>IS/IS: A protocol to let Intermediate Systems talk to other Intermediate Systems. IE: Router to Router. IE: Routing </li></ul>
  5. 5. <ul><li>Link state routing Protocol </li></ul><ul><li>Is-Is build a topological representation of network </li></ul><ul><li>Supports the larger network </li></ul><ul><li>Inter area router </li></ul><ul><li>Intra area router </li></ul><ul><li>It does not use the backbone area </li></ul>
  6. 6. COMPARISON WITH OSPF <ul><li>Ospf network types </li></ul><ul><li>Point to point </li></ul><ul><li>Broadcast network </li></ul><ul><li>NBMA </li></ul>
  7. 7. IS-IS NETWORK
  8. 8. IGP – IS/IS <ul><li>It is also VERY easy to modify to carry other protocols, like IPv4 and IPv6. </li></ul><ul><li>The language is different, but the concepts are the same as in OSPF (Well, not really, but close enough.) </li></ul><ul><li>OSPF Areas=IS/IS Levels </li></ul><ul><li>OSPF Neighbors=IS/IS Adjacencies </li></ul>
  9. 9. IGP – IS/IS <ul><li>Always use Wide Metrics. </li></ul><ul><li>Always set your metrics. </li></ul><ul><li>Always disable Level 1 and force Level 2. </li></ul><ul><li>OSI MTU must be <= 1500. </li></ul><ul><li>You need one Unique OSI address per router. </li></ul>
  10. 10. <ul><li>Questions? </li></ul>

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