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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

538.0. "Dual Homing LED flashing incorrectly ?" by SOS6::GROSSETETE () Wed Apr 15 1992 00:21

    	On a Dual Homing configuration based on 2 x DECconcentrator 500
    and DECbridge 520 and DECbridge 620, you must have, according to
    the manuals, the LEDs light as below :
    	. DECbridge 620/520 Port B : Led GREEN On
    	. DECconcentrator 500 Port M : Led GREEN On
    
    	. DECbridge 620/520 Port A : Led flashing GREEN/RED (standby port)
    	. DECconcentrator 500 Port M :  flashing GREEN/RED (standby port)
    
    	Unfortunately, it seems DECconcentrator 500 firmware has been
    modified with v.3.1, so now, a standby port M blinks RED as if an
    incorrect configuration was set. Does anybody could explain why ?
    
    I downgrade a DEFCN from v.3.1 to v.3.0B and it worked as described
    in the manual.
    
    	Best regards
    	Patrick
T.RTitleUserPersonal
Name		DateLines
538.1What is your configuration?QUIVER::P_SHORTFri Apr 17 1992 09:4812
    
    Patrick,
    
    We have been trying to recreate your problem in the lab but have 
    consistently gotten the expected results.
    
    What was the exact configuration you set up?  Was it as described in 
    the manuals?  Did your configuration change when you downgraded to 
    V3.0B?  There have been no changes in this area from V3.0B to V3.1.
     
    Regards,
    Pam
538.2Config. isSOS6::GROSSETETEFri Apr 17 1992 11:4136
    	Pam,
    
    	Our FDDI ring is "on the table" since we are currently
    testing all products received for our customer.
    These are :
    	4 x DECconcentrator 500
    		3 x DEFCN-AD (v.3.1) and 1 x DEFCN-AB (v.3.0B)
    	12 x DECbridge 620 (v.1.1)
    	7 x DECbridge 520 (v.1.1)
    
    Dual Ring is based on 4 DEFCN and 5 DECbridge 520/620,
    all other DECbridge 520/620 are in dual homing.
    
    If you connect a DECbridge 520/620 in dual homing on 2 DEFCN-AD
    running 3.1
    	Port A LED on DB520/620 Flashes Green/Red
    	Port B LED on DB520/620 is Green ON
    
    	Port M LED on DEFCN linked with DB520/620 Port B is Green ON
    	Port M LED on DEFCN linked with DB520/620 Port A starts to
    	flash Green/Red then after 10 seconds blinks RED only
    
    If you replace the DEFCN connected to DB520/620 Port A by the
    DEFCN-AB running v.3.0B, Port M LED on DEFCN linked with DB520/620 
    Port A flashes Green/Red as mentioned in the DEFCN-AD installation 
    guide (EK-DEFCN-IN-004).
     
	DECmcc ELM 1.2 sees the port M of the DEFCN-AD as being standby
    (not sure it's the correct word), and Dual Homing seems to work fine
    since the link's disconnection between DB520/620 Port B and DEFCN
    Port M correctly activates the Backup link. So, this seems to be a
    "light" problem.
    
    	Patrick
538.3Now we see itQUIVER::P_SHORTFri Apr 17 1992 13:3216
    
    Hello Patrick,
    
    We found a DAS Bridge and tried what you have.  Yes, we do see the
    Port M flashing RED on the DEFCN and Port A flashing GREEN/RED on 
    the bridge. The Port M and Port B on the concentrator and bridge
    respectively were GREEN ON.  When we pulled the connection for Port M
    and Port B the Port M & Port A went GREEN ON.  We reconnected Port M
    and Port B, those lights went GREEN ON.  Port A blinked GREEN/RED for
    some seconds and then blinked RED.  
    
    We are looking into this further and will keep you posted.
    
    Regards,
    Pam
538.4Problem with the LED indication on the DECconcentratorCSC32::TOBINTue Jul 13 1993 15:1111
I have a customer that is seeing the same problem with a DECconcentrator 500 when in dual home 
mode. They say that the problem is related to the version of the ROM code in the concentrator.
They have concentrators that are running both 3.0B and 3.1 of the firmware.  The problem 
only appears on the ones with ROM version 1.0.0, and the others that are running version 0.0.0
work as they should.  They seem to be working fine the problem is with the way the LESs are
acting on the concentrator.  This note has seemed to die.  Does anyone know if there is a fix 
for this problem?  

Thanks

John Tobin
538.5Fixed NPSS::TAYLORMon Nov 15 1993 11:515
    
    
    Fixed in V3.3.1, a pointer to the field test version is available 
    in note 837.last.