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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Something very odd on an older 2514 .
I think you are hitting a performance wall in the 2514. You can't really expect much more than 2 x T1 performance, and then you'll hit a wall. The 2500 series is only a 68040, (old ones are 030's) which "manually" shuffles packets, and can't handle sustained full ether bandwidth. If you look closely with a sniffer, you'd see that its dropping packets. Your FTP slows down because the TCP window is full. --Dean Around 07:46 PM 1/10/2000 -0800, rumor has it that Mr. James W. Laferriere said: > > > Hello All , I've just been doing a few tests on some 2514 routers > I had laying around . I setup the two ether interfaces & on each > like the diagram below > > +--------+ +--------+ > | 2514 |+----------------------+| 2514 | > +--------+ +--------+ > + + > [hub] [hub] > + + > +---------+[ ftp source ] +---------+[ ftp source ] > > I noticed a drastic lessening of expected bandwidth thru the > routers . On the range of seeing only 24-25% of available > ether bandwidth . > But when I plug the two 'ftp source's into the same hub I am > getting a more resonable 66-75% of the available ether bandwidth . > > Has anyone any info on what might be the cause of the lack of > expected thru put . Tia , JimL > > +----------------------------------------------------------------+ > | James W. Laferriere | System Techniques | Give me VMS | > | Network Engineer | 25416 22nd So | Give me Linux | > | [email protected] | DesMoines WA 98198 | only on AXP | > +----------------------------------------------------------------+ > > > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Plain Aviation, Inc [email protected] LAN/WAN/UNIX/NT/TCPIP http://www.av8.com ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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