× NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Announcements

Polls
What is your Experience with NETGEAR Insight cloud management?
Top Contributors
0 Kudos

Force SFP 1GB FDX

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 clients where we are trying to connect the Fiber directly into our WAN GC110 Switches via SFP. Be it MM or SM fiber with SX or LX Netgear tranceivers as needed.

 

We cannot get the link to come up correctly.

 

We are able to test this on other higher end business grade switches. Where we are able to Force the port to 1Gb FDX and the links work perfectly. e.g.HPE Procurve 25xx & OfficeConnect1950's

 

We need to be able to turn OFF the Auto Negociation of the SFP port and allow forcing 1Gb FDX.

"Error! Speed 1000 is supported only when auto negotiation mode is enabled"

 

GC110 Insight Managed 8-Port Gigabit Ethernet Smart Cloud Desktop Switch w/2 SFP Fiber Ports, 1.0.5.35, B1.0.0.3

1 Comment
schumaku
Guru

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.