Conference netcad::hub_mgnt

3150.0. "900CP Port to DELNI with DECSXM-AA supported " by NCMAIL::SCHEID () Thu Jan 11 1996 21:54

    
    I have a reseller who would like use some of our DEChub 900 Products 
    to augment an old DEC network installation. 
    
    
    The reseller is selling a DECHUB 900 Multiswitch 
    			      DECswitch 900EE
    			      Portswitch 900CP 
    			      (2) DECserver 900TM 
    
    
    The reseller would like to do the following, but is being told 
    by DEC support (1-800) that it will work but it is not a supported 
    configuration. With the 900EE create (6) ethernets in backplane, 
    create six different groups within the 900CP Portswitch menu ...
    connect those groups to the various ethernets in the backplane ...
    
    The only unstandard thing that the reseller would like to do is connect
    (3) 900CP Ports to three different DELNI via Port #9 with a (DECXM-AA 
    AUI to THinwire MAU). Each DELNI has three DEMPRs connected to ports
    1-3. 
    
    
    
    
    Config would look like this           
    900CP POrt  ---------DELNI Port #9 with DECXM-AA 
                                |1  |2   |3
				 D   D   D
    				 E   E   E
    				 M   M   M
    				 P   P   P   		
    				 R   R	 R
    
    
    
    Is this a supported configuration ... I realize that we have  2
    repeater hop ... if this is not a supported config ... could someone
    explain WHY ...

    It is MOST LIKELY not a supported configuration, because of the
    possibility of misconfiguration in the DEChub 900 backplane.  
    
    I assume that the 900CP is portswitching each ThinWire coming in to a
    separate port of the DECswitch 900EE.   If it is not, then DEFINATELY NOT
    SUPPORTED.
    
    Forget the old repeater rules, and use the 5-4-3 rule.  You can have
    only 5 segments, 4 repeaters, between the furthest nodes in a collision
    domain, and only 3 of those segments can be multinode (coax or hubs)
    tapped segments. 
    
    your config is maxed-out at EACH port of the 900CP.  So you need to
    bridge from the 900CP coax port to the next 900CP coax port.  the only
    way to do this is through the 900EE, which I assume you have supplied
    expressly for this purpose.  
    
    Remember to disable Heartbeat on coax mau at the DELNI.  Or else it
    will surely fail.
    
    JR

    
    Why is the customer leaving the DEMPRs on the DELNI? Why aren't you
    disconnecting the DEMPRs from the DELNI and hooking each one to a 900CP
    port?

    
    Customer has (3) DELNIs like this  each DELNI has 3-4 DEMPRs on them ...
    We have only three open ports on the 900CP ...
    
    
    I read reply # 1 ... if I am using the EE to switch the CP ports ...
    is this a supported configuration ...
    
    
    The answer is ???