interface speed problem

[tedauction]

Hello, I have a Gigabit port which is only negotiating half duplex. This is a service provider secondary WAN uplink spec'ed at 30 Mbps.

They state that their side is set to full duplex but not sure what their speed settings are.

I hard-coded to full duplex but it still sits on half-duplex. Only when I add 'speed 1000', it starts to operate at full duplex.

Is this OK to leave the speed at '1000' i.e. what happens if the opposite end of the is set to 100 and I have my side set to 1000. The interface status says 'up' but will it actually fail ?

Thanks for any info.

[Shawnw4401]

Tedauction,

Can you post your interface status and configurations? *e.g. show interface Fa0/1 

Also, have you tried duplex auto/speed auto?

[Reza Sharifi]

Hi,

Most providers hard set their sides to full duplex and they encourage their customers to do the same.

Is this OK to leave the speed at '1000' i.e. what happens if the opposite end of the is set to 100 and I have my side set to 1000. The interface status says 'up' but will it actually fail ?

Yes, that is fine. They actually wants you to hard set the port. If they change their side to 100, the interface will go down because there will be a speed mismatch, but they usually don't change their side for no reason or without contacting the customer.

HTH