There is an explanation of sorts in the file /usr/OV/conf/mib.coerce. This
is where
mib variables which are not of the desired type can be forced to be another
type
(eg integers become counters). It also explains that snmpCollect reports
the value
at time 2 minus the value at time 1 divided by the time interval. Netview
also handles
wrapped and cleared values, I think by skipping the data point when the
value at
time 2 is less than the value at time 1. The nature of counters and itegers
and guages
is a standards thing, so I expect that it is defined at the top of some RFC
like rfc1213.
Cordially,
Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
(248) 552-4968 Voicemail, Fax, Pager
---------------------- Forwarded by Leslie Clark/Southfield/IBM on 01-27-99
10:29 PM ---------------------------
"Rodighiero, Lisa" <lrodig@VISA.COM> on 01-27-99 11:59:31 AM
Please respond to Discussion of IBM NetView and POLYCENTER Manager on
NetView <NV-L@UCSBVM.UCSB.EDU>
To: NV-L@UCSBVM.UCSB.EDU
cc: (bcc: Leslie Clark/Southfield/IBM)
Subject: data collection on switches
I'm not sure about Cisco switches, but in Nortel's MIB implementation the
TX/RX cell counts are cumulative. Do a 'Describe' on the MIB entry; it
might tell you what the rollover point is.
>From: Bob Engley <bob.engley@UALBERTA.CA>
>Subject: data collection on switches
>To: NV-L@UCSBVM.ucsb.edu
>X-Envelope-From: owner-nv-l@UCSBVM.UCSB.EDU
>
>Further to my note re: collecting data on cisco 2916/24 switches last
week,
>does anyone know if ifInOctets/ifOutOctets on a switch (any switch!)
>represent the actual traffic on these ports?
>The numbers I am getting from snmpCollect sure don't look real!
>And graphing in real time (from the mib browser) doesn't look any
better.
>My gut feeling is that the numbers are misleading, in that they don't
>represent the traffic, but some aggregate count???
>Any advise would be greatly appreciated!
>
>--
>/in haste
>/Bob
Lisa Rodighiero
Client/Server Network Engineering
Visa International
Email: lrodig@visa.com
Phone: 650-432-3855
Fax: 650-432-2532
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