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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

1888.0. "FDDI on HUB900 Backplane" by SUFNWB::VEITH () Fri Dec 01 1995 07:53

    
    Hi,
    after eight years reading notes within digital, here is my first entry:
    
    On customer site I have a FDDI-ring with three DEChub900 (V4.1.0).
    Within one DEChub there are the following modules:
    
    			DEChub900
    			V4.1.0
    
    ...   ...   ...   ...   .6.		.7.	   .8.
    			    PEswitch    DECswitch  DECconcentrator
    			    900TX       900EF      900MX
    			    V1.1.0      V1.5.2     V3.1.1
    
    				        A: front   A: backplane
    				        B: backpl  B: front
    
    			      ||	   ||           ||
                              ||           ||           ||
    		==================================================
    			FDDI Segment on the backplane
    
    Problem:
    Every time I'm doing a reset on one of the three modules, the other
    modules are loosing their connections to the ring. So I have to
    reconfigure the backplane with FDDI - the FDDI-Channel is still there,
    but on every modul I have to reconnect the FDDI-pin to the
    FDDI-channel.
    
    Is there any well known technical backgroung or is there a bug?
    
    The UNA and DNA are given the following logical links:
    	900MX - 900TX - 900EF
    
    Best regards
    Franz Veith @SUO

T.R	Title	User	Personal Name	Date	Lines
1888.1	FDDI Auto Healing?	49575::PAIVA	Hawkeye - Network Support @GEO	`Fri Dec 01 1995 08:52`	4
	Is FDDI Auto Healing enabled or disabled? Why are you resetting your modules? Pedro
1888.2	some more info's	SUFNWB::VEITH		`Mon Dec 04 1995 08:15`	10
	Hi, FDDI Auto Healing is disabled (Default). If the ring is normally running, there is no need to reset a module. But I have tried to get the ring running for the first time - and therefore is sometimes the need to reset a module. Also if one module goes bad, there will be the same - no more connections on the ring! Best regards Franz
1888.3		NETCAD::DOODY	Michael Doody	`Mon Dec 04 1995 09:31`	8
	What do you mean by the "modules are losing their connections"? Do you have two stations on the ring that can no longer communicate? Or do you mean the Hubwatch Lan Interconnect screen shows them disconnected? Are you making some connection change that causes a switch port to start pre-forwarding? -Mike
1888.4	Franz Veith @SUO	SUFNWB::VEITH		`Tue Dec 05 1995 09:34`	11
	Hi Mike, the two stations still have connection (ring in - ring out). The HUBwatch LAN Interconnect screen shows them disconnected. There have been no changes on the switch ports to start pre-forwarding. My reported problem occurs, i.e. by resetting the PEswitch or the DECconcentrator900. -Franz
1888.5		NETCAD::DOODY	Michael Doody	`Tue Dec 05 1995 16:32`	6
	Okay, if the modules really are connected but Hubwatch shows otherwise, try using the "refresh" button on the LAN interconnect screen. If hubwatch times out talking to the hub it can show things as disconnected. -Mike
1888.6	FDDI HUB900 Backplane o.k.	SUFNWB::VEITH		`Thu Dec 07 1995 05:16`	13
	Hi Mike, you're right! The connections are still o.k. but HUBwatch shows them disconnected. I've tried it with two HUBwatch Systems: In the time, one system shows the disconnections, from the other system I can still see the connections; after a refresh it's o.k. on both systems. By the way, now I learned also something about "auto healing". Thanks and a good time Franz Veith @SUO