Command - show interface status

Posted on 2016-09-21
Medium Priority
Last Modified: 2016-09-23
Hi What is difference between a-1000 and 1000 in Nexus7000 when using command show interface status? Please see the below highlighted. Thank you

Eth6/43 dcba connected 500 full a-1000 10/100/1000

Eth6/45 abcd  connected 501 full 1000 10/100/1000
Question by:eemoon
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LVL 26

Accepted Solution

pony10us earned 2000 total points
ID: 41809451
I don't have a Nexus to confirm however I believe that the "a" indicates that the port (43) is configured to auto for speed while the other port (45) is set to 1000.

Author Comment

ID: 41809477
Thank you for your fast reply. I think you might be right.
after we configure the speed, the port would not has "a-"

If we do not configure the speed, the port would have "a-". Why the ports in the same line card show different value "a-1000", and "a-100"? what decides the value?
LVL 26

Expert Comment

ID: 41809637
When the speed is set to auto it is based on the device at both ends.  It is rare to find a device with a NIC that is only capable of 10/100 anymore however they are still out there.  Mostly older computers and such.  Of course someone might have set the speed on the device to 100 instead of auto if they were seeing problems.  

If one is connected to a switch port that is set to auto it will "step down" it's speed to 100 to accommodate that device.

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