Conference netcad::hub_mgnt

    Go into the DS 900EF and configure the 6 Ethernets to the backplane.
    In the 900FP you will have to go into GROUPING and configure
    each redundant pair to a separate group (1, 2, ...6) and then connect
    each group to a separate Ethernet segment on the 900 backplane.
    
    All point and click, your hands need never touch a keyboard.
    
    dave

Ok, that much I already understood.

What you're saying then is that on the 900FP, a redundant port can 
constitute a connection to the backplane IMB as well as a physical ST 
connection through the front bezel *simultaneously*.

    Yes.  It's more like a redundant pair as opposed to a redundant
    port.  
    
    Ports 1 & 2 are a redundant pair.  So are Ports 3 & 4 and 5 & 6
    and so on.  Each redundant pair is switched as a unit and cannot
    be separated.  1 & 2 cannot be split and both connect to whatever
    IMB you decide on.  You can connect each redundant pair to a separate
    IMB or connect several redundant pairs to the same IMB.
    
    Physically you decide how the fiber runs from the front panel. 
    Port 1 can go to a remote location while Port 2 is not used.  In
    this case one group get the full 10Mb.  Or Port 1 and Port 2 can 
    go to 2 different remote locations.  In this case 2 roups share 
    10 Mb.  The final config would be to have both Ports 1 & 2 go to
    the same remote location.  This would provide a redundant 10Mb path
    in case the primary fiber path broke.

    dave

    RE: .2
    
    See notes 1366.*, 1131.11 and 1131.13 for a conceptual description of
    how the DEFMM (and future per-port switching repeaters) connects to
    both the front panel and multiple backplane segments simultaneously.
    Do not confuse how the DECswitch 900xx ports connect to either the
    front panel or the backplane with the operation of repeaters. They are
    different.

    RE: .3
    
    Note .3 was essentially correct, but I would like to correct some
    terminology used. 
    
    DEFMM ports 1 & 2 are indivisible port pairs, as are ports 3 & 4, 5 &
    6, etc.. By indivisible I mean that ports within a given pair can never
    be places on separate backplane LAN segment. Redundancy is a completely
    different issue.

>>  The final config would be to have both Ports 1 & 2 go to
>>  the same remote location.  This would provide a redundant 10Mb path
>>  in case the primary fiber path broke.

    Just to clarify, the above configuration would provide a redundant
    connection ONLY if the repeaters on each side of the link are
    EXPLICITLY configured to do so.

    When configuring 2 ports on a DEFMM to act as a REDUNDANT MASTER PAIR,
    these 2 ports do not NECESSARILY have to be members of the same
    indivisible pair discussed above (although it would be a good idea to
    configure it as such). As long as the 2 ports are grouped together on
    the same internal LAN (see HUBwatch's port grouping view), you could,
    for example, configure ports 1 and 12 as a MASTER redundant pair.
    
    Notes 908.* provide some discusstion on DECrepeater redundant links,
    but perhaps the best place to look for more info is the DEFMM's
    installation/user's guide.
    
    Regards,
    
    Rich
                                            

    

Thanks very much.