isis - IS-IS Intermediate System to Intermediate System...

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Marc Savoie Page 1 Date: October 27, 1998 Version: 0.4 Subject: IS-IS Routing Protocol Optical Networks Data Integration 1 Intermediate System to Intermediate System Routing Protocol Marc Savoie Optical Networks Data Integration IS-IS
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Marc Savoie Page 2 Date: October 27, 1998 Version: 0.4 Subject: IS-IS Routing Protocol Optical Networks Data Integration 2 Contents What is IS-IS Terminology ISIS Packet Message Link State Algorithm Adding a router to an Area References
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Marc Savoie Page 3 Date: October 27, 1998 Version: 0.4 Subject: IS-IS Routing Protocol Optical Networks Data Integration 3 What is IS-IS Intermediate System to Intermediate System (ISIS) is a Dynamic , Hierarchical, Link State , Interior Gateway routing protocol for Autonomous Systems. Similar to OSPF Based on the SPF Routing Algorithm (Dijkstra) Supports both TCP/IP and OSI CLNP (Connectionless Network Protocol) Limit of 253 Routers in a single Area Originally developed by ISO and modified by (IETF) in 1990.
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Marc Savoie Page 4 Date: October 27, 1998 Version: 0.4 Subject: IS-IS Routing Protocol Optical Networks Data Integration 4 NSAP Vs IP Initial Domain Part Domain Specific Part NSAP (Network Service Access Point) Address Format Network Host IP Address Format Fixed 32 Bits in Length Variable up to 160 Bits in Length 470005XXXXXXXX 0000 AS(2) Area (2) 0200 IP Address(4) S(1)
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Marc Savoie Page 5 Date: October 27, 1998 Version: 0.4 Subject: IS-IS Routing Protocol Optical Networks Data Integration 5 IP Routing Protocols Distance Vector Dynamic Static Hop Count Source Routing Link State RIP, RIP2, IGRP, BGP OSPF, IS-IS , NLSP
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Marc Savoie Page 6 Date: October 27, 1998 Version: 0.4 Subject: IS-IS Routing Protocol Optical Networks Data Integration 6 Autonomous System (AS) Terminology AS100 AS200 L2 Border Router L1 (DR) Area 1 Area 2 L1 L1 ES L1 L1 (DR) L1 Interdomain Routing L2 (DR) L2 L1
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Marc Savoie Page 7 Date: October 27, 1998 Version: 0.4 Subject: IS-IS Routing Protocol Optical Networks Data Integration 7 Level 1 Routers Route Traffic within its Area LSP contain all reachable IP addresses Responsible for Routing Towards Appropriate Level 2 IS Calculates Subnet Mask
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Marc Savoie Page 8 Date:
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