> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Antonio Grassi
> Sent: Friday, June 06, 2008 1:01 AM
> reliable dispatch of the notifications.
Define this term. What you will need to do, and how complex it will
be, depends entirely on the definition of "reliable". First and foremost,
there will always be situations where notifications get lost - whether such
situations are encountered in practice is largely dependent on how important it
is to you to minimize the risk of occurence.
Let's look at the classic case - linkDown on a single-hosted system.
If the link stays down for a few minutes, the notification will probably be
lost, depending on the timeout/retry settings - let's just skip to the timed
out case. The usage of a DISMAN Notification Log MIB on this host can preserve
the information of this notification, until the host reboots... unless the
DISMAN Notification Log MIB is backed to disk... disks can fail...
So... notification delivery costs money - what percentage of your
notifications would you like to ensure delivery of?
The role of the NMS in all this depends on how you use yours, but the
chief aspects of an NMS with regard to this discussion are persistent storage
and query of notifications and notification correlation. Examples of the
latter:
- LinkUp and LinkDown notifications are emergencies when emitted from
critical servers, require immediate attention when emitted from other servers,
are an issue when emitted from workstations, but only during regular business
hours, and are always ignorable when emitted from laptops.
- If a link goes down and comes back up without the system being
rebooted ten times in a week, the operatoir should be instructed to check the
cabling.
- LinkUp/LinkDown notifications may be ignorable when dealing with
trunking, bonded IP addresses, or dynamic routing scenarios.
I leave the rest to your imagination... and your budget.
Mike
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