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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

4231.0. "DECrepeater 90C port partition count?" by RTP4ME::GALLAGHER (Life is good!) Thu Feb 20 1997 17:04

    
    A customer has several DECrepeater 90C's most of which have a
    relatively low port partition count, but just recently they have
    noticed two or three of them have at least one port with
    the partition count in excess of 200...one is even over 700.
    We know from the help what could cause a port to partition.
    Short of putting a data line monitor on the line, is there a
    way to determine exactly what is causing it...jabber, collisions, etc.?
    Also when does that counter get reset?  Is it only during a
    reboot of the module or should it reset by turning the port off
    and back on again?  And lastly, should they be concerned w/ partition
    counts that high?
    
    Thanks for any info,
    Ed Gallagher
T.RTitleUserPersonal
Name
DateLines
4231.1Check the thinwire segments for shorts/opensKERNEL::FREKESLike a thief in the nightFri Feb 21 1997 03:4941
     Ed    
    
>    Short of putting a data line monitor on the line, is there a
>    way to determine exactly what is causing it...jabber, collisions, etc.?

     Not from the 90C using HUBwatch or ClearVISN. Your only option is to use 
     either a packet probe, or a datascope of some description. Some of the 
     older repeaters, not sure about this one, had to wait for 64 collisions, 
     and then it would partition the port. May be the folks in engineering
     would post the algorithm used by the 90C.  

>    Also when does that counter get reset?  Is it only during a
>    reboot of the module or should it reset by turning the port off
>    and back on again?  

     I tried to reset my counters this morning, and it took me 4 or 5 power 
     cycles. If you hit the refresh button too soon after a power cycle then 
     you should expect to see a few strange things like the port number for
     all of the ports becomes -10. After a few seconds it was OK. But it still 
     took a good 4 or 5 power cycles before any affect was visible. So no,
     you can't just turn the port off and then back on.

>    And lastly, should they be concerned w/ partition
>    counts that high?

     Depends on the uptime of the repeater, and if there is anything plugged 
     into the ports. If the repeater has been up for 6 months, has a segment 
     plugged in with stations working off it, and you have about 200 then how 
     often is the segment being broken. Well about 200 times. If there is 
     Nothing pluged in, then you should not see the counter increment at all, 
     as far as I am aware. Because once the port is auto partioned, the 
     counters tend to stop rising.  

     But I would seriously look into those segments that have a high count. 
     Thinwire is renowned for shorts, and opens, and this is the kind of fault
     that could also cause the counter to rise. 

     Hope that helps.

	Steven F
    
4231.2Thanks but you didn't have to stay up all night!RTP4ME::GALLAGHERLife is good!Fri Feb 21 1997 15:076
    Steve,
    
    	Thanks for the quick reply.
    
    Ed
    p.s. What the heck are you doin' up at 3am???????