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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

409.0. "ex" by HGOVC::LEUNGWINGKIN () Sun Oct 03 1993 10:04

    
    Who will be the management bus master if I put a DECbridge 90 onto the
    DEChub 900 backplane?  DECbridge 90 or the DEChub 900 Hub Manager? 
    How about the case of DECbridge 90 and DECagent V2.0 together on DEChub
    90 backbplane and/or DEChub 900 backplane?
    
    Thanks

T.R Title User Personal
Name Date Lines

409.1 Bus Mastership in the DEChub900 QUIVER::SLAWRENCE Thu Oct 07 1993 14:18 21

T.R	Title	User	Personal Name	Date	Lines
409.1	Bus Mastership in the DEChub900	QUIVER::SLAWRENCE		`Thu Oct 07 1993 14:18`	21
	It depends (as usual :-). 'Normally' the Hub Manager is the only manager. On the 900 backplane, the management channel is actually a star with the Hub Manager at the center rather than a bus; this is more reliable because a bad module can only disable management for its own slot. In order to provide DEChub 90 compatibility, the Hub Manager can allow a DECbridge to become the bus master, and therefor a DECagent can act a the agent for the hub (though it will not recognize all the 900 modules). To do this, just don't give the Hub Manager any IP address (either for In-band or the OBM port); since it can't be the agent for the hub without one, it will allow a DECbridge (or a V2.0 DECagent) to become 'bus' master, and will forward messages on the star to emulate the DEChub 90 bus. In this mode the 900 looks like an 8-slot 90; there is no way to use the LAN hopping, manage the 900 modules through the hub, or use any other 900 management capabilities. This feature allows existing DEChub 90 customers using the DECagent 90 and V1.1 HUBwatch to upgrade one thing at a time rather than everything at once.

    It depends (as usual :-).
    
    'Normally' the Hub Manager is the only manager.  On the 900 backplane,
    the management channel is actually a star with the Hub Manager at the
    center rather than a bus; this is more reliable because a bad module
    can only disable management for its own slot.
    
    In order to provide DEChub 90 compatibility, the Hub Manager can allow
    a DECbridge to become the bus master, and therefor a DECagent can act a
    the agent for the hub (though it will not recognize all the 900
    modules).  To do this, just don't give the Hub Manager any IP address
    (either for In-band or the OBM port); since it can't be the agent for
    the hub without one, it will allow a DECbridge (or a V2.0 DECagent) to
    become 'bus' master, and will forward messages on the star to emulate
    the DEChub 90 bus.  In this mode the 900 looks like an 8-slot 90; there
    is no way to use the LAN hopping, manage the 900 modules through the
    hub, or use any other 900 management capabilities.
    
    This feature allows existing DEChub 90 customers using the DECagent 90
    and V1.1 HUBwatch to upgrade one thing at a time rather than everything
    at once.