From: 401anil@gmail.com   
      
   Hi Barry,   
      
   Thanks for your reply.   
      
   But the other way (D->A) traffic flowing is as expected. If the buffer issue   
   is present then the traffic loss should be in both the ways. 'Am I right?'   
      
   Thanks!   
      
   Anil A Kumar   
      
   On Tuesday, 16 October 2012 20:00:40 UTC+5:30, Barry Margolin  wrote:   
   > In article <55e4d1f9-e1b5-44c1-b813-7f857462662e@googlegroups.com>,   
   >   
   >  Anil Kumar A <401anil@gmail.com> wrote:   
   >   
   >   
   >   
   > > +---+   +---+   +---+   +---+   
   >   
   > > | A  |-----| B |-----| C |-----| D |   
   >   
   > > +---+   +---+   +---+   +---+   
   >   
   > > A- Host   
   >   
   > > B- Switch/Router   
   >   
   > > C- Switch/Router   
   >   
   > > D- Host   
   >   
   > >   
   >   
   > > 1. I sent 10,000 frames from A->D, but I received 9,000 frames   
   >   
   > > 2. I sent same 10,000 frames from D->A, this time I received total 10,000   
   >   
   > > frames.   
   >   
   > >   
   >   
   > > Assume I haven't added any firewall/policy/ACL configured on any of   
   >   
   > > interfaces.   
   >   
   > >   
   >   
   > > Now, I would like to know what could be possible reasons for that 1000   
   frames   
   >   
   > > drop.   
   >   
   >   
   >   
   > One of the links in the diagrammed network has lower bandwidth than the   
   >   
   > link to the left of it, and the device between those links doesn't have   
   >   
   > enough buffering to handle this bottleneck, so it drops packets.   
   >   
   >   
   >   
   > E.g. A->B is 10K frames/sec, B->C is 5K frames/sec, and B can buffer   
   >   
   > only 4,000 frames.   
   >   
   >   
   >   
   > --   
   >   
   > Barry Margolin   
   >   
   > Arlington, MA   
      
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