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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

806.0. "ring init, or beaconing problem" by GIDDAY::SMALL (Life is too short to be small) Wed Dec 02 1992 23:52

Hi all,

I a have a customer who has an FDDI ring with a number of DECstation 5000's.  
The DECstations have no problems communicating with each other, but receive an 
FDDI ring init approx every minute.  

All nodes are connected to a DECconcentrator 500, and from there to a 
DECbridge 500.  They have no problems communication across the DECbridge to 
other nodes in their WAN.

fza0: Unsolicited Event -> and Ring Init Received messages are being logged to 
the errorlogger; the errorlog is taking up more space than usual.

What problems might cause this behavior?  How do I troubleshoot this further?

Regards
Allan Small
CSC Sydney

T.R Title User Personal
Name Date Lines

806.1 Cable fault? TKTVFS::IDO Naoki Ido, CSC/TOKYO, EWB, DTN 680-2456 Thu Dec 03 1992 01:12 14

T.R	Title	User	Personal Name	Date	Lines
806.1	Cable fault?	TKTVFS::IDO	Naoki Ido, CSC/TOKYO, EWB, DTN 680-2456	`Thu Dec 03 1992 01:12`	14
	In my experiance, a cable fault somewhere in the ring causes ring init. If MIC connector has attenuation or bending of fiber exsist in somewhere in the ring, ring starts init occationally. Have you check PHY port counters on all of Physical ports? If you can find LEM Reject or LEM error on one of those ports, the problem is in there. You can see those counters with elms ot DECmcc/ELM. \ eg. ELMS>SHOW some_station PHYSICAL PORT port# COUNTER. If you have other vendor station on the ring, you can use SIF command as ELMS>SHOW SIF OPERATION VIA your concentrator. Alarm capability is very useful for such problem. Try START ALARM TERMINAL under elms. The alarm will tell you what is happning on the ring. naoki

In my experiance, a cable fault somewhere in the ring causes ring init. If MIC
connector has attenuation or bending of fiber exsist in somewhere in the ring,
 ring starts init occationally. 
Have you check PHY port counters on all of Physical ports?
 If you can find LEM Reject or LEM error on one of those ports, the problem is 
in there.
You can see those counters with elms ot DECmcc/ELM. \
 eg. ELMS>SHOW some_station PHYSICAL PORT port# COUNTER. If you have other 
vendor station on the ring, you can use SIF command as 
	ELMS>SHOW SIF OPERATION VIA your concentrator. 
Alarm capability is very useful for such problem. Try START ALARM TERMINAL 
under elms. The alarm will tell you what is happning on the ring.

naoki