From: barmar@alum.mit.edu   
      
   In article ,   
    Anil Kumar A <401anil@gmail.com> wrote:   
      
   > 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?'   
      
   No. There's a bottleneck when packets flow from a high-bandwidth link to   
   a low-bandwidtch link, and this results in a backlog. Going the other   
   direction, the flow is from low-bandwidth to high-bandwidth, so there's   
   no backlog.   
      
   >   
   > 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   
      
   --   
   Barry Margolin   
   Arlington, MA   
      
   --- SoupGate-Win32 v1.05   
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