Conference irocz::common_brouters

910.0. ""Link Confidence Test" on Dual Homed VNswitch?" by TKTVFS::WASAKA (OhmiyaII MCS / 71D) Tue May 20 1997 22:12

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".


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.


Thanks for any information.
Hiroyuki Wasaka
MCS/Japan