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Overview

Connectionless Network Services (CLNS) is a Layer 3 protocol similar to IPv4. CLNS uses network service access points (NSAPs) to address end systems and intermediate systems.

ES-IS provides the basic interaction between CLNS hosts (end systems) and routers (intermediate systems). ES-IS allows hosts to advertise NSAP addresses to other routers and hosts attached to the network. Those routers can then advertise the address to the rest of the network using Intermediate System-to-Intermediate System (IS-IS). Routers use ES-IS to advertise their network entity title (NET) to hosts and routers attached to that network.

ES-IS routes are exported to Layer 1 Intermediate System-to-Intermediate System (IS-IS) by default. You can also export ES-IS routes into Layer 2 IS-IS by configuring a routing policy.

ES-IS generates and receives end system hello (ESH) hello messages when the protocol is configured on an interface.

ES-IS is a resolution protocol that allows a network to be fully ISO integrated at both the network and data layer.

For more information on CLNS, see Configuring Support for Connectionless Network Services and the J-series Services Router Advanced WAN Access Configuration Guide.

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