End System-to-Intermediate System. OSI protocol that defines how end systems (hosts) announce themselves to intermediate systems (routers). See also IS-IS.

See End System to Intermediate System.

(n.) End System to Intermediate System is an OSI protocol that allows end systems to announce themselves as intermediate systems. End Systems are equivalent to the internet concept of a host that uses all layers in the communications model. Intermediate Systems are relay communications nodes or forwarders between End Systems and are effectively a subset of End Systems.