Thursday, January 25, 2018

Auto Negotiation - Half/10Mpbs on a Gig Link

Hi,

I have a Cisco 1921 (Router A) connected to a Fortigate Firewall (Router B).

The Cisco and the Fortigate are both using GigabitEthernet and Auto Negotiation.

The Fortigate is reporting 1000Mpbs/Full (Perfect!) The Cisco is reporting 10Mbps/Half (Oh dear..)

I have tried manually setting the Cisco to 1000Mpbs/Full to match the Fortigate, however this brings the link down.

As far as I was aware a failure in auto-neg should result in Half/100Mbps and not Half/10Mbps?

Has anyone seen this before? The cable has been swapped. I am starting to suspect a faulty port.

Thanks in advance



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