Conference netcad::hub_mgnt

518.0. "Config Questions?" by ANGLIN::CLAYTON (Merlin Clayton DTN 445-7217) Wed Nov 24 1993 10:38

Questions about the following config:



      	      	DEChub 900 #1		
      	     	+-------------------+
      	     	|D |D |D |D | | | | |
      	     	|E |E |E |E | | | | |
      ||========|F |T |T |T | | | | |
      ||      	|A |M |M |M | | | | |
      ||1st fl	|R |M |M |M | | | | |
      ||	+-------------------+	
      ||	    |  |  |	   10-Base-T	    		   +-------+
      ||	    |  |  +----------------------------------------| DETMR |
      ||FO Bldg	    |  |			    		   +-------+
      ||Backbone    |  |    10-Base-T		+-------+
      ||	    |  +------------------------| DETMM | DEChub ONE
      ||	    |				+-------+
      ||	    |  10-Base-T   +-----+
      ||	    +--------------|DEMON|
      ||			   +-----+
      ||
      ||
      ||2nd fl    (same config)
      ||
      ||
      ||3rd fl    (same config)
      ||
      ||
      ||4th fl    (same config)
      ||
      ||
      ||======================================= ( remote building  )
			Fiber			( 6 10-Base-T ports)
						(    required	   )
					

Q1.  Any problems with the remote workgroup 10BaseT hubs (DH900 TM, DH90 T,
     and DEMON) being connected to the wiring closet hub on each of the 
     4 floors via UTP to the hub-based DETMM?

Q2.  Are the remote workgroup hubs (DH900 TM & DH90 T) manageable down to
     the port level using Hubwatch? .... generic SNMP NMS?

Q3.  What is the best way to provide the required 6 10BaseT ports to the 
     remote building via the fiber backbone and still have management to 
     the port level?

This configuration is for an educational institution. On each floor there
will actually be several workgroup hubs for Labs - up to 24 PCs in a Lab.
For example, on the 4th floor there are 11 Labs requiring workgroup connections
for up to 24 PCs per Lab (DH900TM in DEChub ONE Config), and another 7 labs
requiring 6 PC connections (DH90 T config).

Q4.  How would I add a token ring workgroup LAB in the same manner as the 
     10BaseT work groups with the DH900TM / DH90T / or DEMON?


Any other alternatives are welcomed...

Thanks.

Merlin

    Q1) Check your maximum repeater hops.  Since the DEFAR is only on the
    backplane Thinwire, a hop from it to any other module in a 900 counts
    as a hop.  You may need to replace the DEFAR with a DEWGF (fiber
    bridge; at which point watch out for the 200 node limit on the
    backplane side).
    
    Q2) The DETMM is managable down to the port level whether standalone or
    in a hub (standalone it requires its own IP address, in a hub the IP
    address is optional since it can be managed using the address of the
    Hub).
        The 90 Repeaters are managable in a 900 hub (I'll be posting a note
    shortly describing the changes from 90 to 900).  If they are in a
    DEChub90 you need a DECbridge90 in the same hub and a DECagent
    somewhere on the network to manage them.  If they are standalone they
    are not SNMP managable.
    
    Q3) I think that the cheapest solution (now) is a DECrepeater900TM with
    a DEChub ONE.  Way more ports than you need, but just that is than a
    repeater, a bridge, a denma, and a hub.
    
    Q4) For token ring you need a DEChub900 and token ring MAUs (DECmau
    900TL) ; if you need to connect it to token rings outside the hub you
    need a DECrepeater900{S|T}L; if you need it to connect it to the
    backbone and/or ethernet you need a non-DEChub something...