Conference netcad::hub_mgnt

4430.0. "Link Confidence Test on DualHomed VNswitch" by TKTVFS::WASAKA (OhmiyaII MCS / 71D) Thu May 22 1997 01:00

	-< Cross-Posted in GIGASWITCH,COMMON_BROUTER >-

Hello,

We have two customers where a mysterious symptom goes out.
The following Network Configuration,


	+===============+
	|		|
       F|	[DECconcentrator900MX][M]+------+
       D|		|			|
       D|		|                       |
       I|		|                      [B]
	|	[VNswitch900EF]            [VNswitch900EF]
       R|		|                      [A]
       I|		|                       |   
       N|		|			|   
       G|	[DECconcentrator900MX][M]+------+   
	|		|              
	+===============+           The State suddenly changes STANDBY to
				    "Link Confidence Test Remote".


There is VNswitch900EF connected with DECconcentrator900 by Dual Homing.

The state of each Port connected with Dual Homing after a while becomes
abnormal. Port "A" on the VNswitch900EF side is in the state of STANDBY, but
Port on the Concentrator900 side enters the state of "Link Confidence Test"
suddenly. At this time, PHY on the Concentrator900 side is changed from usual
amber blinking into lighting. 

However, there is no problem in a usual operation. Moreover, the Dual Homing 
function operates normally. 

This phenomenon happens even if Concentrator900 taking the place of 
GIGAswitch/FDDI.

Could anyone please explain to me what this happens?

Thanks for any information.
Hiroyuki Wasaka
MCS/Japan

    The dual homed configuration has a known bug.  The fix is making
    its way towards a maintenance release.  The bug has to do with
    a memory reference that was optimized away by the compiler.
    
    Hugh

	Thank you for answering my question.

	This phenomenon does not have the influence directly because 
	there is no problem in operation. However, the customer cannot 
	judge at first sight whether it is a trouble of FDDI Port or not.

	Please teach us a rough estimate date to which Maintenance Release is
	released.

	Should I escalate to IPMT formally?


	Thank you for your support.
	Hiroyuki Wasaka
	MCS/Japan

    IPMT would be appropriate.  The specific Maintenance Release
    has not been identified yet.
    
    Hugh
    

>    IPMT would be appropriate.  The specific Maintenance Release
>    has not been identified yet.

There will be a V1.5-005 maint release of the dvnef coming up shortly (in a
few days) to fic this problem.

Dan