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What is the difference between Ethernet Port "status-up, Protocol=down" and "status-down, Protocol=down"

Posted on 2010-08-24
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Last Modified: 2012-05-10
We have a cisco 2821 with an HWIC-1FE ethernet module.  We get "status-up, Protocol=down" even if no cable is connected to it.  This is different from our 7206, which gives "status-down, Protocol=down"  if we disconnect the patch cable from a similar port.  Is the link status up/down device dependent, and not "standard" based on cable presence or something?

FastEthernet0/3/0          unassigned      YES manual up                    down
FastEthernet0/3/0.1        172.16.223.69   YES manual up                    down
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Question by:hassarfj
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Galtar99 earned 500 total points
ID: 33512898
That sounds like the port may be bad.
FastEthernet0/3/0 is up, shows that the physical layer is up, it is seeing an electrical signal from another device.
Line protocol is up shows that a layer 2 protocol is working between the devices and it's receiving keepalives.
I'd open a TAC case to get that module replaced.
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Author Closing Comment

by:hassarfj
ID: 33513896
I appreciate the response, and generally agreewith it, but I doubt the module is defective - it is new - it replaced a 4-port switch module that showed the same up/down interface characteristics.  we swapped out the 4-port to get some better QoS capabililties - it was not defective either
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