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Nokia also makes complex backbone carrier-grade network switches based on the Intellectual Property portfolio they acquired from Nortel.

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That kind of stuff is the closest that they would come to compete with the others cited. They're all trying to get into datacenter gear, but Cisco specifically has gotten out of various levels of service provider network gear (they sold off all their cable network stuff, for example) which is where Nokia, Ericsson, etc all make their bread and butter

Cisco is still in the SP networking space, but they’ve been pushing heavily into datacenter and core routers generally (vs. edge which are more common in SP networks).

Granted, I only worked as a lowly dev in the Cisco SP routing team, and I haven’t been keeping up to speed with their work.

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