A couple of days ago I did a planned software upgrade of an HP5406zl.

Since the installed firmware version was quite old it was not possible to update directly to the latest release, an upgrade path must be followed:

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Many network vendors are publishing simulators to the community. A simulator can be a way to complete a training or can be used for a PoC.

GNS3 maybe is the most famous emulator while others like eNSP for Huawei, Cisco's VIRL, Juniper Junosphere are available or will be available soon.

The big name missing so far was …