Interlinking switches / port speeds

- T
- thefunnel
  
  Contact options for registered users
posted
16 years ago

Thu, Jul 12, 2007 4:09 PM

Hi,

I am having difficulties connecting two switches (3750s) together via copper (using auto mdix). I was always under the impression ports should either be set to fixed speeds or set to auto at both ends. You should not have a combination of fixed / auto or mismatches can occur. I seem to be seeing the opposite:

"speed 10" to "speed 10" = NOT WORKING "speed 100" to "speed 100" = NOT WORKING

But if only one end is set to a fixed speed:

"speed 10" to "speed auto" = WORKING "speed 100" to speed auto" = WORKING

I have also tried setting both ends to full and half duplex - still nothing. Would someone mind explaining why this is happening? I can achieve the desired effect by only configuring the speed on one end but I thought Cisco avoid against this?

Thanks,

Paul

Loading thread data ...

- B
- briggs
  
  Contact options for registered users
Vote on answer
posted
16 years ago

Thu, Jul 12, 2007 4:37 PM

^^^^^^^^^^^^^^^

Auto mdix requires autonegotiate.

If one end is auto, that end will do the auto-mdix.

I don't see that you've tried "speed auto" to "speed auto". That's the setting that I would recommend.

Cabling-Design.com Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.