IS-IS Deep Dive: The Intermediate System to Intermediate System Routing Protocol
A complete guide to IS-IS: NSAP/NET addressing, Level-1/Level-2 hierarchy, PDUs and TLVs, adjacency formation, DIS election, LSP flooding, metrics, SPF/PRC, route leaking, authentication, IPv6 and multi-topology, modern extensions (TE, Segment Routing, Flex-Algo), an IS-IS vs OSPF comparison, and working configs for Cisco IOS-XE, IOS-XR and FRRouting.
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September 27, 2026