"input packets with dribble condition detected" ??

Answered Question
Jan 20th, 2009
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Hi

I do'nt know exact meaning of the

"input packets with dribble condition detected" in the output of show int fa1/0


also can't find the relative information about this error counter in cisco.com


what is the exact meaning??


Correct Answer by marikakis about 8 years 2 months ago

Hello,


http://www.commsplace.com/Knowledge/ITcs/html/tutorials/applications/ethernet_basics.htm

"The InterPacket Gap (IPG) is the fixed time gap between Ethernet Frames."..."the maximum 802.3 frame size is 1518 bytes"..."A frame that is defined as a 'dribble' is one that is greater than 1518 bytes but can still be processed. This could point to a problem where the IPG is too small or non-existent such that two frames join together."


In ethernet controller/tranceiver specifications, dribble error is said to mean that "packet did not end on a byteboundary" or "non-integer number of bytes in packet". Now, the ethernet controller I looked up (http://www.bitsavers.org/pdf/3Com/Etherbox_Sep83.pdf) has receive buffers to put packets received from wire. Each receive buffer has a header part with information about the frame received (besides the actual contents of the frame received). One of the bits of the receive buffer header says whether a dribble error occured for the frame, hence the term "dribble bit error".


Kind Regards,

M.

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Sanghee Han Tue, 01/20/2009 - 22:10
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Thanks for your help.

I read the linked document.

but don't understand yet.


"input packets with dribble condition detected"


[Description]

Gives the dribble bit error, which indicates that a frame is slightly too long.


could you give me some explanation

=> what is the dribble bit error?

=> "a frame is slightly too long"

that means it's size is longer than what?

received frame?




Correct Answer
marikakis Wed, 01/21/2009 - 01:31
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  • Gold, 750 points or more

Hello,


http://www.commsplace.com/Knowledge/ITcs/html/tutorials/applications/ethernet_basics.htm

"The InterPacket Gap (IPG) is the fixed time gap between Ethernet Frames."..."the maximum 802.3 frame size is 1518 bytes"..."A frame that is defined as a 'dribble' is one that is greater than 1518 bytes but can still be processed. This could point to a problem where the IPG is too small or non-existent such that two frames join together."


In ethernet controller/tranceiver specifications, dribble error is said to mean that "packet did not end on a byteboundary" or "non-integer number of bytes in packet". Now, the ethernet controller I looked up (http://www.bitsavers.org/pdf/3Com/Etherbox_Sep83.pdf) has receive buffers to put packets received from wire. Each receive buffer has a header part with information about the frame received (besides the actual contents of the frame received). One of the bits of the receive buffer header says whether a dribble error occured for the frame, hence the term "dribble bit error".


Kind Regards,

M.

Sanghee Han Wed, 01/21/2009 - 15:28
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Thanks for your help.


Now, I know about this error counter.

Thanks very much again.


Kind Regards,

SangHee.

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