Conference netcad::hub_mgnt

2799.0. "recurring lockups with DECbridge-90" by CX3MAN::AMBER (Mark Amber, CNS-West (DTN)592-4645) Tue Sep 26 1995 12:58

    At the CXO3 site, we have a recurring problem with DECbridge90s locking
    up and not passing any traffic until they are power cycled.  The
    problem moves around between different bridges (not the same one each
    time), but its been happening about once a day and is getting very
    annoying.
    
    We have about 50 DB90s on the LAN which we installed about two years
    ago.  They ran great for the first year and a half with flash V3.1. 
    Then we upgraded them all to V3.4 and they ran fine for about 3 months. 
    In the last 3 months we have had a rash of lockups - on average one per
    day.
    
    We tried upgrading the flash to V3.9 over this past weekend, but that
    didn't seem to help any.  We have had 3 lockups in the last two days.
    We are really at a loss to determine the cause of this problem.  Any
    help or ideas from a DEChub engineering would be greatly appreciated.
    
    Our next course of action is to downgrade back to V3.1, but we really
    don't know if the flash version is the problem, or if there is
    something "new" on the LAN that can cause these lockups.
    
    Visibility of this problem is very high.  The affected users are CSC
    specialists who are on the phone with external customers.  When these
    lockups happen, the specialists loose all connections on their
    workstations which include important systems such as CHAMP, STARS, and
    CSC32 which are necessary for the specialist to take customer calls. 
    
    We are looking for assistance from DEChub engineering to resolve this
    problem.  If a formal escallation path is required, please let me know.
    
    -Mark Amber
     CXO Network Manager

    are they in parallel with other bridges?
    thereby putting one of the bridges into backup state?