[mrtg] Sorta OT, clear counters vs snmp was RE: Re: ODD spike
gabrielle.roth at xo.com
Tue Mar 20 19:18:02 MET 2001
> > > If so: counter reset (perhaps switch reset).
> > >
> > Switch didn't reset :
> > SWITCH uptime is 51 weeks, 2 days, 35 minutes
> telnet to the switch, followed by "clear counters" ?
Veering a bit OT here:
The OP mentioned a Cisco 2924 switch. I apologize if what follows is really
obvious to the rest of you, it wasn't to me, but I'm still a relative newbie
with Cisco stuff.
There was a discussion several months ago about the relationship between the
numbers you see with "sh in" on a cisco box and the numbers that you get
from the interfaces MIB. In a message to the list dated 18 July 2000,
Matthew Moore stated [paraphrased] that he had the word straight from Cisco
that the counters read by snmp are separate from the counters you get from
"sh in" (on a router); the snmp counters hold data from the time the box was
booted. (There is a gap in the list archive between 6 July and 18 August.
Fortunately I made a hard copy of this message. :D Matthew are you still on
the list? Any comment?)
Because I am curious, I decided to check this out in our lab.
routers: 2651, 3640 X 2, 2514; switches: 6509, 5500, 2916, 1924
telnet to [box], send some pings to create some traffic because not much
goes on in the lab right now.
snmpwalk [box] [comm] interfaces > before
telnet to [box], clear counters
snmpwalk [box] [comm] interfaces > after
diff before after, look for lower numbers in after
"clear counters" reset the counters in the interfaces table in only the
6509, 5500 and the 1924. Based on past experience with Cisco, I also expect
this to be OS dependent. :)
I realize that this doesn't solve the OP's problem but I wanted to bring
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