Conference netcad::hub_mgnt

3390.0. "Need advice on 900EF spanning tree" by SNOFS1::KHOOJEANNIE (Humpty Dumpty was pushed) Fri Mar 22 1996 06:14

    I have a customer here who wants to use the spanning tree functionality
    of the DECswitch 900EF to achieve some sort of redundancy in the
    network as follows, and he wants to be able to specify which port will
    be forwarding and which port will be in backup.
    
        ___________________
        | DECswitch 900EF |
        |_________________|
        port 3|    |port 4
              |    |
    forwarding|    |placed into backup by spanning tree
              |    |
             same LAN
    
    He tried changing the PATH COST parameter, but
    this did not make any difference - the MAC address of the port
    continued to determine which was active and which was not.
    
    I have read the new 900-Series Switch Reference manual, and am still
    none the wiser.  Anyone know whether this is possible???
                                                         
    Thanks for any help
    Jeannie 
    

    Hi Jeannie,
    	      this configuration works well we use this at Tasman Pulp &
    Paper, it enables use to build along with the FDDI and portswitch
    modules a bullet proof backbone. Give me a call if you need more
    details there are also some other notes in this conferance on this.
    
    Cheers Graeme.
    	

    Have spoken to Graeme today and his (working) configuration is slightly
    different (he has 2 DECswitches in the hub for redundancy).
    
       _________      _________
       |DS900EF|      |DS900EF|
       |_______|      |_______|
   active|   |   standby|   |
         |   |          |   |
         |   |active    |   |standby
      ___|___|__________|___|___Flex Channel 1
             |              |
      _______|______________|___Flex Channel 2
    
    Does anyone know if this should work with 1 DECswitch only as per .0?
    
    Jeannie