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Conference 7.286::fddi

Title:FDDI - The Next Generation
Moderator:NETCAD::STEFANI
Created:Thu Apr 27 1989
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2259
Total number of notes:8590

1196.0. "FDX<->FDDI automatically ??" by TKOV51::AOKI_H (Hiromitsu AOKI, Network Team/SE, Japan DEC) Thu Jan 06 1994 23:52

	In FDX program summary(category of benefit), the following
 	is written:
	
	The switch from standard FDDI to FDX and back to FDDI is handled 
	automatically by the FDX protocol implemented on the adapters or 
	concentrator.

	Q1. So far all of DEC's FDDI adapters(latest version) has FDX
	    implementation. Is this correct ?

	Q2. I heard several months ago that switch from FDDI to FDX is 
	    done by setting MIB via SNMP. FDX to FDDI is done automatically.
	    But FDX program summary says that both of FDDI <--> FDX are
	    done automatically. Which is correct ?

	Q3. Is DECconcentrator implemented FDX ?

	
	---Regards,
	---Hiro AOKI(TKOV51::AOKI_H)
T.RTitleUserPersonal
Name		DateLines
1196.1FDX is automatic; concentrators implement a ringMUDDY::WATERSFri Jan 07 1994 09:1914
>	Q2. I heard several months ago that switch from FDDI to FDX is 
>	    done by setting MIB via SNMP. FDX to FDDI is done automatically.
>	    But FDX program summary says that both of FDDI <--> FDX are
>	    done automatically. Which is correct ?

    Both.  Use the MIB to *inhibit* full-duplex operation.  If you enable
    FDX in the MIB, then it turns on and off automatically depending on
    your FDDI topology.

>	Q3. Is DECconcentrator implemented FDX ?

    Not possible.  Full-duplex requires point-to-point links, not token 
    rings.  Replace DECconcentrator with GIGAswitch to convert the single
    token ring into a set of independent pt-pt links (or smaller rings).
1196.2QUIVER::STEFANIHave the # for the Mars Observer?Fri Jan 07 1994 15:2828
    >>        Q1. So far all of DEC's FDDI adapters(latest version) has FDX
    >>            implementation. Is this correct ?
    
    Can't speak for all of them, but I know the DEFEA supports it.  Contact
    the Product Managers, Sharon Oneill (DELNI::ONEILL) and George Nielsen
    (DELNI::G_NIELSEN) for info on the others (DEFAA, DEFQA, DEFTA, DEMFA,
    and DEFZA).
    
    >>
    >>        Q2. I heard several months ago that switch from FDDI to FDX is
    >>            done by setting MIB via SNMP. FDX to FDDI is done
    >>            automatically.
    >>            But FDX program summary says that both of FDDI <--> FDX are
    >>            done automatically. Which is correct ?
    
    The firmware, driver, or host-based app (usually through SNMP) can turn
    on or turn off FDXEnable.  If it's not turned on, then on point-point
    connections, the FW won't even try to enable FDX.  If it IS turned on,
    then on point-point connections where BOTH nodes have FDX enabled, FDX
    operation will commence.  There are additional MIB objects which
    indicate the current FDX status.  See the latest DEC private MIB for
    details on these objects.
    
    Just as an FYI, on the DEFEA we have FDXEnable shut off by default. 
    You need to explicitly enable it in the driver or app.  This was done
    intentionally.
    
       - Larry