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We are using Firewalls in HA and have a 1Gb fiber hand off from our service providers. (Cogent) They always force to 1Gb Full Duplex. (Cisco Nexus & catalyst lines) We have seen this with over 15...
The interesting part? On fiber links as well as on standards compliant fiber SFP/SFP+ modules, there is neither auto negotiation nor any ability to control speed and HD/FD what you are behind. Auto negotiation and link configuration does apply to copper, BASE-T SFP transceiver support auto-negotiation bits and the 5-bit selector bits on copper links only. Fiber transceivers work on one speed only.