[mrtg] Re: Cisco 29xx switch target question
lsheldon at creighton.edu
Wed Apr 18 15:39:35 MEST 2001
> I am monitoring a number of Cisco 29xx switches and I am having difficulty
> working out how the targets apply to the physical ports of the switch. For
> example, I have a line into physical port 1 and the target set to 2 in the
> MRTG config file. Do the Cisco switches count their console port and VLAN
> addresses as a target or is there and easier was of monitoring specific
> physical ports?
My reading of the relevant RFC's and my experience with several different
kinds of machines is that the there is no particular relationship
between occurrences of interfaces on a box and occurrence numbers in the
Many implementations (some 3Com and some cisco come quickly to mind) assign
MIB occurence numbers (usually at boot-time) in a process that appears to
have randomness as an input.
So there is no way to predict what the OID instance number will be for
"serial 3", "fastethernet 4/2" and so on.
- L. F. (Larry) Sheldon, Jr. -
. Unix Systems and Network Administration .
- Creighton University Computer Center-Old Gym -
. 2500 California Plaza .
- Omaha, Nebraska, U.S.A. 68178 Two identifying characteristics -
. lsheldon at creighton.edu of System Administrators: .
- 402 280-2254 (work) Infallibility, and the ability to -
. 402 681-4726 (cellular) learn from their mistakes. .
- 402 332-4622 (residence) -
. http://www.creighton.edu/~lsheldon Adapted from Stephen Pinker .
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