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North American Network Operators Group

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Re: Something very odd on an older 2514 .

  • From: Dean Anderson
  • Date: Tue Jan 11 17:35:35 2000

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  |
>       | babydr@baby-dragons.com | DesMoines WA 98198 |   only  on  AXP |
>       +----------------------------------------------------------------+
>
>
>
>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
           Plain Aviation, Inc                  dean@av8.com
           LAN/WAN/UNIX/NT/TCPIP          http://www.av8.com
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++





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