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Why third-party SFP+ still fail on Aruba 3810M/2930M with allow-unsupported-transceiver: the HPIDv2 flag at byte 0x7B
Even with allow-unsupported-transceiver enabled, HPE Aruba 3810M and 2930M switches showed an amber fault for generic SFP+ modules, including ones recoded to masquerade as a J9151A. The author traced the behaviour to HPE's HPIDv2 challenge-response authentication: the module EEPROM carries a flag…