[mrtg] Re: Cisco 29xx switch target question

Larry Sheldon 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
MIB trees.

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                                                 .
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. http://www.creighton.edu/~lsheldon    Adapted from Stephen Pinker     .

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