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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

3604.0. "DS900EF and table overflow" by SCASS1::DAVIES (Mark, NPB Sales, Dallas,TX) Mon Jun 10 1996 19:13

    WHat happens to a DS900EF when the forwarding table overflows?
    
    Does it start forwarding all messages?
    
    Thanks,
    
    Mark
    
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3604.1You must have one hell of a network!CGOS01::DMARLOWEHave you been HUBbed lately?Mon Jun 10 1996 21:5814
    Well, that means that you must have all 8,000 addresses in the table
    and active.  Remember that the AGE TIMER ages out any address that
    hasn't been heard from in the last 2 minutes.
    
    If you dump the address table to a file, it will include both active
    and aged out entries up to a total of 8,000.
    
    If the 900EF does go into flood mode at >8,000 active entries (and I
    assume it does) it shouldn't last too long as some addresses should be
    aged out and then flooding should stop.
    
    99.9999999% of all networks shouldn't have to worry about table limits.
    
    dave
3604.2Thanks.SCASS1::DAVIESMark, NPB Sales, Dallas,TXTue Jun 11 1996 11:551
    
3604.3That would also be one verrry busy LAN :-)NETCAD::BATTERSBYDon't use time/words carelesslyTue Jun 11 1996 15:3611
    I didn't get in to see this note yesterday. Yes, what Dave describes
    is right. Flooding would occur if the 8,000 address limit is
    exceeded. I'll also add that as I recall when doing some of the
    original testing of the switch products, we found it difficult to
    test this (but we did manage to eventually). It would be quite
    difficult to exceed the 8,000 address limit in 99% of the normal 
    network configurations encountered by customers, and not have
    some small number of addresses age out over a short period of time
    (order of magnitude in minutes).
    
    Bob