Re: Linkdown traps

1998-10-21 22:28:22
Subject: Re: Linkdown traps
From: Leslie Clark <lclark AT US.IBM DOT COM>
To: nv-l AT lists.tivoli DOT com
Date: Wed, 21 Oct 1998 22:28:22 -0400
I concur. Netview does not automatically do anything other than report, via the
Events Display, unsolicited traps from devices in the network. You are free to
customize those traps and do what you think is best. Perhaps issue a demand
poll to bring the status up to date? This is the sort of trade-off you have to
about when deciding on your polling frequency. If you have the network
to do that sort of processing, you should certainly have the bandwidth to let
Netview do frequent status polling. Unless, of course, there are so many
devices in the network that it takes netmon 30 minutes to get through them all.
In which case you might consider offloading polling to mid-level managers.
But assuming the normal case, in which a 5 minute polling cycle is sustainable,
I would take it. That seems to be the amount of time people can tolerate. AND...
you can set that cycle differently for different devices and networks.


Leslie Clark
IBM Global Services - Network & Systems Management - Detroit


I do not think netmon does any status checking on link down/up traps from
the SNMP agent on the device, but it DOES do additional status checking when
it generates its own Interface Down/Up trap.  If the device has multiple
interfaces (like a router), netmon will check the other interfaces rather
than waiting for their turn in the polling cycle.  This also works with
distributed polling using MLMs.

        -----Original Message-----
        From:   Simon Huang [SMTP:SIMON.HUANG AT CHASE DOT COM]
        Sent:   Tuesday, October 20, 1998 08:31
        Subject:        Linkdown traps


        This question has been bugging me for a while.  Does Netview
        netmon) do anything when it receives a linkdown trap from a device
        (router,switch..) reporting an interface down?  Does Netview/netmon
        the interface status immediately or it just waits for the next
        cycle?  For example, if my polling interval is 30 minutes and a
        reports a linkdown trap for an interface five minutes after the last
        successful poll.  When will Netview present the correct status for
        interface (right away or 25 minutes later)?

        My observation is Netview waits for the next polling cycle and does
not do
        any status checking for the linkdown/linkup traps.  But I am not
sure about
        this.  I just want to know for sure what is Netview suppose to do
when it
        receives a linkdown/up trap as far as status information goes.


        Simon Huang

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