Welcome to the world of Intermediate System - Intermediate System (IS-IS) !
Intermediate System to Intermediate System (IS-IS) is a routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It accomplishes this by determining the best route for data through a packet switching network.
The IS-IS protocol is defined in ISO/IEC 10589 as an international standard within the Open Systems Interconnection (OSI) reference design. The Internet Engineering Task Force (IETF) republished IS-IS in RFC 1142, but that RFC was later marked as historic by RFC 7142 because it republished a draft rather than a final version of the (International Organization for Standardization) ISO standard, causing confusion.
Contents at a Glance
1 IS-IS - Introduction , Compare OSI/TCP IP
2 IS-IS - Connection Less Network Protocol
3 IS-IS - Overview - Level-1 Routing
4 IS-IS - Level-2 Routing - ISIS Configuration
5 IS-IS - Neighborship - Topology - Database Tables
6 IS-IS - Hello - Adjacency - Authentication Concepts
7 IS-IS - Hello and LSP Authentication Scenarios
8 IS-IS - Metric Concepts - Wide and Narrow Metric
9 IS-IS - LSP Concepts - Default Route Propagation
10 IS-IS - ECMP - Route-Summarization
11 IS-IS - Route-Leaking and Advanced Configuration
12 IS-IS - DIS Election - Hello-Hold Interval - Padding
13 IS-IS - Three Way Handshake - Cisco and IETF
14 IS-IS - IS-IS for IPv6 - Single and Multi Topology