I have recently identified a L1 Auto negotiation issue due to Duplex Mismatch. Our security equipment is configured as Auto negotiation and we were encountering Duplex mismatch error counters ( Collision and Tx errors) at the interface.
As per the logs I could clearly see that the port was configured as Duplex Mode full. However,DC guys are telling me that it will show as full even if it is configured as Auto!
The Interface status is literally shown as FULL in both capabilities and Status output. However, Network engineer who handle this Switch is telling me that it will show it as full event if it is shown as auto!? Is this true? I think he is trying to bullshit me. Why on earth a switch will show that port status as Full if it is configured as Auto?
If someone have an access to Cisco 5596 equipment, Can you guys check this for me or help me to verify it?
I believe if a port is configured as Auto then the status and capabilities will show as Auto itself and Not full.! I'm also ready to prove me wrong, if it is really the case.
This is the query I raised in NE Stack exchange.
https://networkengineering.stackexchange.com/questions/54045/how-to-debug-l1-auto-negotiation-issues
Please check the status of the accepted answer.
<Masked> # sh int status | i HSM
Eth100/1/5 <Masked> connected 128 full 100 10/100/1000
Eth100/1/6 <Masked> connected 128 full a-1000 10/100/1000
Eth100/1/7 <Masked> connected 128 full 100 10/100/1000
Eth100/1/8 <Masked> connected 128 full a-1000 10/100/1000
<Masked> # sh int e100/1/5 capabilities
Ethernet100/1/5
Model: N2K-C2248TP-1GE
Type (Non SFP): 10/100/1000BaseT
Speed: 10,100,1000,auto
Duplex: full
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