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Re: Auto Delete of Node Down ???

To: nv-l@lists.tivoli.com
Subject: Re: Auto Delete of Node Down ???
From: Jeff Fitzwater <jfitz@PRINCETON.EDU>
Date: Tue, 18 May 1999 09:09:33 -0400
Organization: Princeton University
Reply-to: Discussion of IBM NetView and POLYCENTER Manager on NetView <NV-L@UCSBVM.UCSB.EDU>
Sender: Discussion of IBM NetView and POLYCENTER Manager on NetView <NV-L@UCSBVM.UCSB.EDU>
Thanks James.

It appears netmon will delete a resolved node, even if it is down to
start with.   Strange though, the event stream indicates that it is
initially up after LOADHOSTS adds it.  Kind of misleading.

Thanks for the info.

Jeff Fitzwater
Princeton University

_____________________________________

James Shanks wrote:
>
> Well, as I recall  -
>
> The Node Down delete is done by netmon which means that reverse address
> resolution must be working.  Normally, netmon would not add a device he
> could not resolve so this problem does not arise but with loadhosts you in
> effect said "I know better" and forced a database add of an admittedly
> bogus node.  Now netmon cannot resolve it to prove to itself that it is in
> fact down (because that's when nodes get deleted -- after they have been
> down for a specified length of time).  And it would have had to have been
> "up" for some period of time if memory serves me  to qualify for the delete
> as well.  But don't quote me on that.  I don't work on netmon and
> everything I know is second-hand.
>
>  Other than deleting this node from the GUI I don't know how you can get
> rid of it gracefully.
>
> James Shanks
> Tivoli (NetView for UNIX) L3 Support
>
> Jeff Fitzwater <jfitz@PRINCETON.EDU> on 05/17/99 04:40:30 PM
>
> Please respond to Discussion of IBM NetView and POLYCENTER Manager on
>       NetView <NV-L@UCSBVM.UCSB.EDU>
>
> To:   NV-L@UCSBVM.UCSB.EDU
> cc:    (bcc: James Shanks/Tivoli Systems)
> Subject:  Auto Delete of Node Down ???
>
> Any ideas on this???
>
> Netview 5.1 with good 5.1.1 patch.
>
> Since there is no cammand-line way to remove a host, I thought I would
> investigate the SNMP config parameter of "Node Down Delete Interval".
>
> YES it does delete nodes when the time expires and you can set this for
> default or host specific values via GUI.
>
> It does however appear that if the host is not DNS resolvable for some
> reason (The reverse lookup is not set) and the host is down when it was
> created, then it will never get removed when the timer expires.
>
> We do have some host that we ping in other countries that do not have
> reverse name resolution set up.
> I did a simple test by creating a host via the "LOADHOSTS" command using
> a bogus IP with bogus name and it would not get deleted.
>
> Q.  Is this the way it works or is it a bug?
>
> Thanks for any help.
>
> Jeff Fitzwater
> Princeton University

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