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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

2043.0. "900FP/HUBwatch find MAC address?" by WOTVAX::BANKST (Network Mercenary) Thu Feb 23 1995 13:18

    I have been showing a customer how to use HUBwatch and he was impressed
    with the ability to bring up a host list for a repeater port (900FP),
    or search for a given MAC  address.  Trouble was it was very
    inconsistent.  Sometimes HUBwatch found it sometimes it didn't.  
    
    It seemed as though it could find DECnet format MAC addresses better
    than 08-00-2b... MAC addresses.  (We were looking for a probe that was
    talking regularly) It never seemed to find the probe, even though it
    was connected to one of its segments,and an associated bridge could see
    it.
    
    So how long does the repeater keep a track of the MAC addresses it has
    seen, and when does it age them out?  How many will it track on a
    segment?
    
    *.	Another point was the host list display, it would show DECnet
    addresses as 2.14 for example but IP addresses were never shown or
    shown as 0.0.0.0?  How do you get IP addresses, and can it display
    names instead?
    
    The 900FP had V1.0.1 firmware.
    
    Thanks 
    
    Tim
T.RTitleUserPersonal
Name		DateLines
2043.1NETCAD::DRAGONFri Feb 24 1995 11:0718
    
    Hi Tim,
    
    	I'm not sure off hand how long the addresses remain before being 
        aged nor how many entries are maintained (one figure which I saw
        was 2-8 minutes). The Extended Repeater MIB states that this is 
        implemention dependent (see erptrAddrDBPortAddrTable). Perhaps one 
        of the Repeater FW folks would answer that one.
    
        As for finding DECnet format MAC addresses (ie AA-00-04...) better, 
        this may be due to more frequent use of this format by the stations
        involved.
    
        Currently HUBwatch will not give you IP addresses nor will it give
        you IP names on the Windows platform. It is being looked into.
    
    Hope this helps,
    Bob
2043.2probe should not be a top talkerNAC::FORRESTTue Mar 14 1995 11:508
    Per Engineering, a 256 entry table is kept of the most recently seen
    addresses. So, perhaps there's no aging time - but any given node's
    address should be seen immediately after it has transmitted.
    
    Unless you are actively getting data from a probe, it will be a silent 
    listener. Even if you are graphing a statistic, the polling interval on
    the graph is probably at least 5 seconds. On a very large, busy LAN,
    this could be enough time to exceed the 256 node limit on the repeater.