Hi, On Fri, Oct 24, 2014 at 01:49:53PM +0300, Martin T wrote: > according to Cisco documentation(for example > http://www.cisco.com/c/en/us/td/docs/routers/access/interfaces/nm/hardware/installation/guide/conntge.pdf) > 1000BASE-T ports can not be looped back through use of an external > loopback cable. This should be because of NEXT cancellation > implemented in 1000BASE-T phy. Is there a way to disable this on newer > Catalyst or Nexus brand switches so that one could use RJ45 loopback > cable on 1000BASE-T ports?
The main reason why this isn't working is that there are no "send" and
"receive" lines you could loop - everything is used bidirectionally.
gert
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