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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

668.0. "Illegal Configuration??" by VIDOAN::IZZO () Thu Jan 27 1994 09:55

Is the following customer configuration legal - I think not.  If it 
in fact is illegal then how can I validate that the configuration is 
contributing to poor performance (NCP counters?).  - Thank you.
                                   
	--------------------
	 |      |        |
	VAX     |       VAX
	      DELNI
		|
	      DEMPR
       	        |
	    --------------         ------------
      HUB90 |  		 |   HUB90 |          | 
	    |------------|	   ------------
	    |  DR90FL   ------------- DR90FA  |
	    |------------|         ------------ 
	    |            |	   |  DR90T  ------------PC
	    |------------|	   ------------
	    |            |         |          |
	    |------------|	   ------------
T.RTitleUserPersonal
Name		DateLines
668.1not enough dataQUIVER::SLAWRENCEThu Jan 27 1994 12:502
    Can you provide some more details on the nature of the problem?
668.2more infoVIDOAN::IZZOThu Jan 27 1994 13:1012
    This is a Pathworks environement.  DOS applications are server (VAX)
    based.  Performance between the PC clients and the VAX server is not 
    quite what we would expect.  We are looking the possibility of server 
    configuration problems which may well account for the poor performance.
    
    However, my concern in the base note is around the number of repeaters
    between the clients and servers.  Does configuration violate the 2(4?) 
    repeater rule?
    
    Thanks,
668.3DEMPRs and HB don't get alongALBANY::BARTLEYFri Jan 28 1994 16:3110
    Doesn't look like it violates the 5-4-3 rule. The first thing you want
    to check is that the transceiver connected to the global port of the
    DELNI has it's Heartbeat(SQE) disabled. If it is enabled, The DELNI will
    pass that Heartbeat on to the DEMPR which thinks it is a real collision
    and JAM all is segments. This alone will make a good network go down
    the tubes real quick.
    
    Hope this helps,
    
    Dave