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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

4416.0. "CRC errors on 900EE" by NYOSS1::BUONOMO (Show me the MONKEY) Thu May 15 1997 12:20

    Hi All,
    
    This is the second switch the customer has tried any ideas 
    what may be going on ??
    
    Thanks,
    Lou
    
    
Per our phone conversation here is the email about DECSWitch.

We recently installed a DECSWITCH 900 EE ( DEBMP-DA) on our LAN to isolate
two(2) LANs; (  LIVE LAN and   New 10BT LAN)  We configured the DECSWITCH
without  routing and enabled Ethernet  only on both AUI ports only.

We installed a Network General Sniffer on one side( 10BT LAN side ) of the
DECSWITCH
to monitor traffic.  The sniffer is reporting CRC errors on the 10BT LAN  side,
even when
there is no device connected to it besides the Sniffer.

The frame in error is if of the following format:

DST  address  -  AAAAAAAAAAAA
SRC  address  - AAFF07FEFFFF
Ether Type        - FF01
Byte size           -  differs  from 60  -  132.


We DO NOT get this error on all frames being passed to the new 10BT LAN.  We
only
get arounf 100 CRC errors in day, but still this should not happen.

Is there  a special setup needed for the DECSwitch 900EE.?

Any help is greatly appreciated.

Thanks

Art
T.RTitleUserPersonal
Name		DateLines
4416.1Tell us more about the EE and the previous one if possibleNETCAD::BATTERSBYThu May 15 1997 14:044
    What image type and rev is loaded to the DECswitch 900EE?
    also what is the hardware rev of the EE?
    
    Bob
4416.2here you go...NYOSS1::BUONOMOShow me the MONKEYMon May 19 1997 11:389
    
    DECswitch 900EE/MP
    H/W = 1/2, #2002
    S/W = V01.0.001
    
    Hope this helps,
    
    Thanks,
    Lou
4416.3There must be more here than meets the eye.... :-)NETCAD::BATTERSBYTue May 20 1997 18:2813
    So you have a Router image currently loaded to this DECswitch 
    900EE and you are seeing CRC errors from a source address you
    can't identify.
    My first thought is if your customer is using this DECswitch 900EE/MP
    as a simple bridge to bridge 2 LANs, why not load it with the bridging 
    code rather than using the MP image.
    My next thought is that there is more here than meets the eye.
    What exactly is connected to each AUI port of the DECswitch? IE:
    What type of cable is being used, and are there any other components
    such as MAUs (transceivers), DELNI's, connected to the AUI port that
    the CRC errors are being seen on?
    
    Bob
4416.4more info..NYOSS1::BUONOMOShow me the MONKEYTue May 27 1997 21:078
    Sorry I was traveling for the week...
    
    The customer states that they are only using bridge code.
    They have 1 AUI connected to a transceiver cable attached to a piece 
    of thickwire and the other AUI to a sniffer.
    
    Thanks,
    Lou