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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

705.0. "Wrapping and DECconcentrators" by CTOAVX::BEAULIEU () Tue Sep 15 1992 09:42

    
    Hi,
    
    I had a Concentrator wrap on me yesterday, and I have a couple of
    questions.  When the Concentrator wraps, what should happen to the
    lights on the concentrator?  Since the Concentrator was sick I don't
    know if what I was seeing was correct. Also I couldn't talk to it with
    MCC. (thanks god for OBM) The OBM and a Tekalek monitor confirmed the
    ring was wrapped. If a Concentrator wraps, should MCC be able to talk
    to the offending Concentrator?
    
    Thanks, Mike Beaulieu

T.R	Title	User	Personal Name	Date	Lines
705.1	PHY indicator and wrapping	BAGELS::LEVY		`Tue Sep 15 1992 11:55`	5
	The wrapped port's PHY LED will no longer be solid green. Depending on what caused the wrap, the LED could be blinking green (backhoe fade), solid red (BER degradation), or off (management disable). A wrapped port only affects management access via that port.
705.2		KONING::KONING	Paul Koning, A-13683	`Tue Sep 15 1992 12:35`	8
	Huh? Management access isn't "via that port". You talk to the MAC of a concentrator over the ring. If you're on the same ring as the concentrator, you can talk to it. Port status is purely a physical layer property and has no direct relationship with what the datalink layer does. paul
705.3	c'mon paul....	BAGELS::LEVY		`Wed Sep 16 1992 12:28`	3
	You can't talk to the MAC if your access to the ring is "via the port" that's been wrapped. If there's no physical layer between the NMS and the CON's MAC (because of the wrap), you're SOL.
705.4		KONING::KONING	Paul Koning, A-13683	`Wed Sep 16 1992 15:59`	8
	That's what I said. The reason I objected to the other wording is that it creates the misperception that MAC access is directly associated with a given port, which of course is not the case. I've had to spent significant time on several occasions straightening out this confusion; it's not a hypothetical mistake! paul
705.5	looks like we're in violent agreement	BAGELS::LEVY		`Wed Sep 16 1992 16:55`	4
	Actually, I think someone could read .2 and conclude that a wrapped port will never affect MAC access. Clearly, whether it does or not is topology-dependent.
705.6	I concur, but I had a misfunctioning A-B card	CTOAVX::BEAULIEU		`Wed Sep 16 1992 17:21`	10
	Guys, Thanks for the info. The concentrator's A-B card was replaced today. We reset the concentrator yesterday and today it would not talk to MCC. (but the ring wasn't wrapped) OBM showed this. Anyways, with the topology I have, I belive that I should have been able to talk to the concentrator. I'm writing it off as a bad card. later, Mike Beaulieu