Conference 7.286::fddi

993.0. "DEFEB counter questions" by GADWAL::WOESTEMEYER (Why??...Why not!!!) Fri Jun 11 1993 08:23

A customer has a question on counter on a decbridge 610.  
what he sees is as follows:

Counter Creation Time =  4-JUN-1993 16:58:48.20
                          Port Restarts = 1
                  Total Frames Received = 136758926 Frames
                   Total Bytes Received = 45261327408 Bytes
                 Device Frames Received = 243 Frames
                  Device Bytes Received = 15552 Bytes
              Multicast Frames Received = 3489347 Frames
               Multicast Bytes Received = 472510352 Bytes
                      Total Frames Sent = 16679304 Frames
                       Total Bytes Sent = 2147220629 Bytes
                     Device Frames Sent = 557428 Frames
                      Device Bytes Sent = 38457425 Bytes
                  Multicast Frames Sent = 1121516 Frames
                   Multicast Bytes Sent = 85682647 Bytes
                    Bad Frames Received = 2469 Frames
		   Transmit Frames Lost = 0 Frames
               Lifetime Exceeded Frames = 0 Frames
                    Receive Frames Lost = 0 Frames
                        Frames Filtered = 116531569 Frames
                         Bytes Filtered = 42221370762 Bytes
                       Receive Overruns = 0 Frames
               Forwarding State Entered = 1
                Invalid Device Messages = 0 Frames
              Bad Hellos Limit Exceeded = 0
              Multicast Frames Filtered = 0 Frames
       Multicast Device Frames Received = 243 Frames
           Multicast Device Frames Sent = 557428 Frames
                     Device Frames Lost = 0 Frames
                  Transmit Error Frames = 4 Frames
                     Bad Bytes Received = 1582608 Bytes
       Multicast Source Frames Received = 0 Frames
		   Transmit Error Bytes = 391742 Bytes
                   Invalid Device Bytes = 0 Bytes
        Multicast Device Bytes Received = 15552 Bytes
            Multicast Device Bytes Sent = 38457425 Bytes
                        Oversize Frames = 41 Frames
                         Framing Errors = 1167
           Transmit Multiple Collisions = 157395
                           Carrier Lost = 0
               Collision Limit Exceeded = 3
 Unknown Destination Addresses Received = 991
              Frames Addressed Filtered = 116531569 Frames
               Bytes Addressed Filtered = 0 Bytes
                Bytes Protocol Filtered = 0 Bytes
         Collision Presence Test Failed = 14
                           Length Error = 0
                              


Our questions are:

 1.  The "Collision Presence Test Failed" counter is non-zero, but we
     have COLLISION PRESENCE TEST is set to FALSE.  How can this be:

 2.  Examining the following counters:

                  Transmit Error Frames = 4 Frames
                   Transmit Error Bytes = 391742 Bytes

     Since the max Ethernet frame is 1541 bytes, the max number of bad
     bytes should be 4*1541 = 6140.  Why are the numbers so different?

 3.  What are the following counters actually indicating?
                   
                       Receive Overruns = 0 Frames
                        Oversize Frames = 41 Frames

	from the decmcc V1.3 Bridge Module use:

	Receive Overruns - Number of frames received that were larger than
		the bridge's internal buffer size (illegal Ethernet size).

	Oversize Frames - Number of oversized frames that were received
		on this line.

	To me it seems that these 2 counters are almost the same, but for
	the life of me I cannot determine the difference.
                         

Cross posted in FDDI and MCC notes conferences.

Steve Woestemeyer
CSC/CS - Network Support Team

    Numbers 1 and 2 appear to be bugs. I'll send a message off to the
    support engineer. What version of firmware is this bridge running? 
    
    The third one looks like a misleading description in the manual.
    Oversize Frames refers to packets that exceed maximum Enet size.
    Receive Overrun is a LANCE silo error, which occurs when the LANCE
    can't transfer data to buffer memory fast enough.
    
   
    
    Dave
    

    Dave,
    
    The customer has 4 DB610's, all of them are at V1.3.  
    
    Thanks for your input,
    Steve