Chapter 6. Applying Integrated IS-IS


Terms you'll need to understand:

  • Intermediate system (IS)

  • End system (ES)

  • Connectionless Network Protocol (CLNP)

  • End system “to “intermediate System (ES-IS)

  • Level 1

  • Level 2

  • L1L2

  • International Organization for Standardization-Interior Gateway Routing Protocol (ISO-IGRP)

  • Circuit

  • PDU

  • DIS

  • NSAP

Techniques you'll need to master:

  • Understanding OSI models and protocols

  • Identifying IS-IS networks, routers, and interface types

  • Developing an IS-IS addressing scheme

  • Configuring and verifying Level 1 and Level 2 ISs

The Intermediate System “to “Intermediate System (IS-IS) routing protocol is a flexible and robust routing protocol suitable for both ISO Connectionless Network Protocol ( CLNP ) and IP applications. In the IP world, it has emerged as the sole realistic alternative to OSPF for Interior Gateway Protocol (IGP) applications in ISP internetworks. IS-IS was originally designed to be used as a dynamic routing protocol for the ISO CLNP and was later adapted for routing IP in addition to CLNP as integrated IS-IS or dual IS-IS. IS-IS is the IGP of choice in most tier 1 ISP environments and telecommunications companies, which explains why Cisco has included it in the BSCI exam knowledge base requirements. IS-IS is a link-state protocol comparable to OSPF. OSPF has enjoyed a more formal evolution, whereas IS-IS has developed as needs have arisen. It was originally called DECnet Phase V Routing and renamed to IS-IS when it was adopted by the ISO in 1988.



Cisco BSCI Exam Cram 2 (Exam Cram 642-801)
CCNP BSCI Exam Cram 2 (Exam Cram 642-801)
ISBN: 0789730170
EAN: 2147483647
Year: 2003
Pages: 170

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