Implementing Intermediate System to System (IS-IS)

Implementing Intermediate System to System (IS-IS) provides an in-depth understanding of a robust routing protocol commonly deployed in service provider MPLS environments and, in some cases, adopted within enterprise network architectures. It introduces the core IS-IS architecture and explains how routing relationships are formed between neighbors, including the concept of hierarchical levels and how they impact routing decisions. Learners explore key operational elements such as metrics, route propagation, and the way IS-IS advertises network reachability across domains. The course also includes practical configuration and implementation examples across Cisco IOS, Cisco IOS XR, and Juniper Junos platforms, helping learners observe how IS-IS behaves in different vendor environments. It further explains why IS-IS is known for its scalability and efficiency, and how it supports the demands of both large-scale service provider infrastructures and evolving enterprise routing requirements.