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Article #267Re: 10 byte fragments on fddi - a sign of trouble?
From: Ron Perloff
Date: Tue, 06 Oct 1992 00:22
Date: Tue, 06 Oct 1992 00:22
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In article <ON7T+38+F@linac.fnal.gov> crawdad@fncent (Matt Crawford) writes: >While looking at one of our fddi rings I saw a fair number of 10 byte >fragment frames which had just the initial frame code byte, a valid >local destination address, and half of a source address. Is this >"normal"? Yes! In FDDI networks, each source node is responsible for stripping frames it has sent. If the node is not a bridge, it recognizes frames it has stripped by seeing its own MAC address in the source address field. Because nodes must minimize latency, they have already retransmitted the first several bytes of the frame before they have received the complete source address field, so it is too late to strip the entire frame. That is okay, however, because MACs 'know' not to receive partial frames. Ron Ronald S. Perloff rasp@xlnt.com XLNT Designs, Inc. (XDI) 15050 Avenue of Science Suite 106 San Diego, CA 92128 619 487 9320 - FAX: 619 487 9768
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Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!ames!haven.umd.edu!darwin.sura.net!wupost!uwm.edu!ogicse!network.ucsd.edu!sdcrsi!xlnt!xlnt.com From: rasp@xlnt.com (Ron Perloff) Newsgroups: comp.dcom.lans.fddi Subject: Re: 10 byte fragments on fddi - a sign of trouble? Message-ID: <1215@xlnt.COM> Date: 6 Oct 92 00:22:02 GMT Article-I.D.: xlnt.1215 References: <ON7T+38+F@linac.fnal.gov> Sender: postmaster@xlnt.COM Organization: xdi Lines: 24