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I do not know what a CLNS client (ES) is practically?

I understand how an IP Workstation can be an ES, but what kind of machines are CLNS ESs? Where is CLNS practically used in the world?

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Re: I do not know what a CLNS client (ES) is practically?

ISO CLNS is heavily used in the Telco environments and (integrates ISIS) in ISPs where ISIS, which is different than ISO, is used for IP routing, since ISIS is encapsulated in CLNP (CLNS Network Packets). Specifically with billing and provisioning (SONET DWDM systems for example). Any CLNS host that is an end station (e.g. Does not forward CLNS packets out another interface that they came in on) will show up in "show clns neigh" as an ES (DMS Phone switches, Core Director DWDM nodes, etc). Only CLNS routing devices show up as IS adjacencies.

Hope this answers your questions,

Don

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