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ES-IS Question

In practical term, what kind of devices would I see at ISP as ES? Could you give me some examples with brandnames?

Does ES have OS that runs ES-IS or we have to install some kind of software for ES-IS?

Does ES-IS work like IP ARP?

Thanks,

1 ACCEPTED SOLUTION

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Silver

Re: ES-IS Question

An ES-IS is an End station in a CLNS environment. This could be something like a Nortel DMS250, Ciena Core Director, any other CLNS host that does not route CLNS packets.

ES's will have a ISO CLNS stack that they run in SW to allow them to communicate with ISO CLNS.

ES-IS does not work like IP Arp. Adjacencies are formed with CLNP Hellos from all ES's with the NSAP and SystemID of every host on it's segment. To communicate off segment, to another Area, the routers for that area send an ATT (Attach) bit into the Area telling all ES hosts to send data to them that is not within the area.

Hope this helps you,

Don

1 REPLY
Silver

Re: ES-IS Question

An ES-IS is an End station in a CLNS environment. This could be something like a Nortel DMS250, Ciena Core Director, any other CLNS host that does not route CLNS packets.

ES's will have a ISO CLNS stack that they run in SW to allow them to communicate with ISO CLNS.

ES-IS does not work like IP Arp. Adjacencies are formed with CLNP Hellos from all ES's with the NSAP and SystemID of every host on it's segment. To communicate off segment, to another Area, the routers for that area send an ATT (Attach) bit into the Area telling all ES hosts to send data to them that is not within the area.

Hope this helps you,

Don

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