Conference npss::gigaswitch

920.0. "change config for forever link please..." by DEKVC::YOUNGCHANKIM () Wed Feb 05 1997 22:28

	        GIGA/FDDI               GIGA/FDDI
	        +-------+               +-------+
+---+   FDDI    |   1   |    ATM        |  2    |      +--+
|   |===========|       +---------------+       |======|  |
+---+           +---+---+               +---+---+      +--+
CISCO               | ATM                   | ATM     CISCO
	            |                       |
	        GIGA|FDDI               GIGA|FDDI
                +---+---+               +---+---+     +---+
+---+   FDDI    |  3    |    ATM        |  4    |=====|   |
|   |===========|       +---------------+       |     +---+
+---+           +-------+               +-------+     CISCO   
CISCO							

This config is SamSung semiconducter manufacture company in korea.
four GIGAswitch/FDDI connected as if loop seen above.
Each GIGAswitch/FDDI have a ATM line card and connected CISCO7000
whitch have many lagacy LAN.
few day ago, a GIGAswitch/FDDI was hang-up and they had serious problems.
So,they request full redundancy configuration even if a GS/FDDI is down 
and/or hang-up.
We recomends 2 ATM link between GS/FDDI or add-on GS/ATM for another paths,
but that's recomends are not clear for them.
no problems ,if without down,any equip add-on to above config.
Who's good idea forever link  ?

yckim

        The existing configuration is already redundant with respect to the
    portion which involves the GIGAswitch/FDDI system.  The parts which
    aren't redundant are the single connections from the cisco boxes to the
    GIGAswitch/FDDI system.  Is this the part you are asking about?
    
        Generally, people would dual home the cisco devices to different
    GIGAswitch/FDDI systems to address that lack of redundancy.
    
        How did the GIGAswitch/FDDI system "hang"?
    
    
    MDL

    No spare cable between two GS/FDDI and far from each GS/FDDI.
    CISCO7000 are already connected dual-homing to a GS/FDDI.
    hang-up reasons are not clear because they repidly power reset for  
    blocking other critical problems.
    if a GS/FDDI is add on like a shadow GS/FDDI(every line has two GS/FDDI
    and they are connect to hunp group each other),Is this good solution for
    permanent link ?
    they are strongly hope that use ATM backbone like 920.1 configure. 
    
    yckim   

        You can certainly place two GIGAswitch/FDDI systems in each
    location in place of the single systems in the diagram.  It would be
    rather expensive.
    
    MDL