Tuesday, June 12, 2018

How to debug L1 Auto negotiation issues?

One of our linux host have started switching it gears recently.While checking the interface speed,I could see that the interface have switched down to 10Mbps. I Would like to debug to the root cause of the issue. We are planning to perform the below mentioned actions.

  1. Perform the cable test to check on the sanity of the cable
  2. Double check on the switch configurations.

Given that tcpdump works from L2 and up there is no point in getting the tcpdump . Do you guys have any other pointers? Perhaps, syslog/dmseg ?? How do you approach issues and collect stats on issues at L1/Phy layer?



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