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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.R	Title	User	Personal Name	Date	Lines
1196.1	FDX is automatic; concentrators implement a ring	MUDDY::WATERS		`Fri Jan 07 1994 09:19`	14
	> 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).
1196.2		QUIVER::STEFANI	Have the # for the Mars Observer?	`Fri Jan 07 1994 15:28`	28
	>> 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