1. Intermediate System to Intermediate System IS-IS Mohit Anchan TYIT-A
Roll no- 03

2. What is Intermediate System to Intermediate system (IS-IS)?
Routing Protocol
moves information efficiently within a computer network
determines the best route for datagrams through a packet-switched network
It was defined in ISO/IEC 10589:2002 as an international standard within the OSI reference design

3. IS-IS is an interior gateway protocol
cont….
IS-IS is an interior gateway protocol
It is also a link-state routing protocol
It uses Dijkstra's algorithm for computing the best path through the network

4. An IS-IS network consists of:
End Systems
Intermediate Systems
Areas
Domains

5. Types of IS-IS Addresses
There are two types of IS-IS addresses:
Network Service Access Point (NSAP)
It is the logical point between the network and transport layers
NSAP address fields are Initial Domain Part (IDP) and the Domain-Specific Part (DSP)
Network Entity Title (NET)
NET addresses identify network layer entities or processes instead of services

6. Protocol Structure Intra-domain routing protocol discriminator
PDU type (Protocol Data Unit)
Length indicator
ID length
Version/protocol ID
Version
R - Reserved bits
Maximum area addresses

7. Thank You.