I am not familiar how SNMP is used in the real world so explanations like these
help me out a lot. Good job and thanks.
Dave Shield <[EMAIL PROTECTED]> wrote: On 05/06/07, Need Help wrote:
> You stated "you don't have to use the se list method, but you must ensure
> that the same row has the same index each time the container is loaded"
>
> I thought the "container_load" routine reloads the container from "scratch"
> when it is called, so why must and index (which was generated previously and
> stored in a particular row of the container) be reused and placed in the
> same exact row of the container when the container is being rebuilt from
> scratch. Am I not understand something?
Think about how this looks to the admin who's trying to monitor his/her systems.
I'm particularly interested in one specific tuner that's been playing
up recently,
so I walk the AVInterfaceTable and the TunerTable, and find that it is
the device
with index 582
So I set up a script to regularly monitor the settings of the row
with index 582.
A few minutes later, your "container_load" routine kicks in to re-load
the latest
information, and chooses a completely new set of index values. Suddenly
row 582 refers to a completely different bit of kit (or nothing at
all), and the tuner
that I'm actually trying to monitor now has index 319.
That's clearly not very helpful for a sys admin.
It's standard practise in SNMP for index values to remain stable - once you've
assigned a particular index to a given row (and hence to a particular piece of
hardware, or software, or whatever the MIB is monitoring), then that index
should remain the same.
It's usually acceptable to re-assign indexes if the whole system reboots
(or the SNMP agent is killed and restarted). But not in normal operation.
Does that make sense?
Dave
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