Link‐State IGP Migrations
Gonzalo Gómez Herrero, Jan Antón Bernal van der Ven · 2010
This chapter focuses on migrations involving the current state-of-the-art link-state core routing Interior Gateway Protocols (IGPs), specifically Open Shortest Path First (OSPF) and IS-IS. The reasons for migrating or adapting the core IGP are diverse, ranging from consequences after a simple router upgrade to fix a related software defect to complete network integration as the result of a company acquisition. Regardless of the rationale, each migration requires careful planning and execution, and each operational change in the core IGP must be carefully considered both because of its domain-wide scope and because of future implications on additional protocols and applications that rely on the IGP. The chapter discusses two major types of migration of link-state IGPs. The first section deals with hierarchical migrations within a link-state IGP. The second section describes the processes and resources to migrate completely from one link-state IGP to another. Controlled Vocabulary Terms computer networks; routing protocols