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RE: [nv-l] Monitoring nodes running ospf

To: <nv-l@lists.us.ibm.com>
Subject: RE: [nv-l] Monitoring nodes running ospf
From: "Allison, Jason \(JALLISON\)" <JALLISON@arinc.com>
Date: Mon, 4 Apr 2005 09:05:14 -0400
Delivery-date: Mon, 04 Apr 2005 14:05:56 +0100
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Thread-topic: [nv-l] Monitoring nodes running ospf
Im still not quite understanding what you are looking to do except to
bind to a dynamic SNMP Interface and not to a specific asset.  As you
know, NetView is a Network Management application that will show you a
topology of your network.  What you are looking to do if I understand
you correctly is not represent an IP topology, but something different.

This is difficult to do, but not impossbile.  However, I think with your
interface changing like it can, adds a level of complexity that may not
be able to be accomplished with NetView.  If you are dead set of
accomplishing this, you may want to consider scrapping using netmon.  It
might be easier to turn off polling completely for those interfaces and
write your own simple appilication that will status devices the way you
want them to and then send NetView the status you want it to display.
You will most likely want to create non-IP devices on the map that will
represent that status you are querying.

Good luck,

Jason Allison
Principal Engineer
ARINC Incorporated

-----Original Message-----
From: owner-nv-l@lists.us.ibm.com [mailto:owner-nv-l@lists.us.ibm.com]
On Behalf Of jeff.ctr.vandenbussche@faa.gov
Sent: Friday, April 01, 2005 11:05 AM
To: nv-l@lists.us.ibm.com
Subject: Re: [nv-l] Monitoring nodes running ospf


How  can  I let xnmsnmpconf define a "preferred" interface? What would
happen if I define this interface as my "virtual" IP interface on the
box? That sounds like what I want, but I am not sure what the syntax of
xnmsnmpconf  is to do this.

Also, another problem I am running into:

When I stop/start software on some boxes, the status of the active
interface changes.  In other words,  I stop my custom app on host1,
netmon changes the status of ethernet 0 (the active interface) on host1
from normal to critical on the map.  If I display object status from the
menu, the status is listed as normal (but still displayed as critical on
the map. These should have nothing to do with Netview (although they
include SNMP

I even tried to rebuild the topology without my custom topology. letting
netmon do the only discovery, and I got the same results.  What gets
worse is that I shutdown a custom app on host3, and host1 and host2 E0
switch from normal to marginal??????

Note that in my seed file I have both ICMP and SNMP defined as status
polling (can this be done?).  This was the only way I could get netmon
to status everything correctly (except this problem).  I tried using
either ICMP or SNMP and still got the same results.

I have left a message with support, but I am still waiting for them to
call me back.


             James Shanks


             Sent by:                  nv-l@lists.us.ibm.com


                                       Re: [nv-l] Monitoring nodes
             04/01/2005 08:34          ospf




             Please respond to





I'm not the expert with regard to using our APIs, but  I don't see how
you can do what you want using our code, unless perhaps you can set up
name resolution so that each interface is regarded as a separate host.
The way you want to do things and the way NetView was designed to do
them seem to
me to be two entirely different things.   As others have already
the NetView model is to let  bind with whatever interface it is directed
to.  We use whatever works.  Once on the box, we let SNMP tell us what
the other interfaces are doing, rather than try to set up separate
over them.   xnmsnmpconf lets you set up a preferred interface, but it's
one per host, and if that one's down we'll try another.  You really are
on your own here with this design you've cooked up, so far as I can see.

James Shanks
Level 3 Support  for Tivoli NetView for UNIX and Windows
Tivoli Software / IBM Software Group

             Sent by:
             owner-nv-l@lists.         nv-l@lists.us.ibm.com

             03/31/2005 04:18          Re: [nv-l] Monitoring nodes
             PM                        ospf

             Please respond to


What I am mainly looking for is a way to bind Netview to do all it's
outgoing/incoming SNMP querys to a particular IP (interface ) on the
server.  I have 3 IP's (interfaces) defined on the server:

server - this IP/interface uses ospf to select which interface to use


I want Netview to always use the IP associated with server, but Netview
seems to always use the active interface at the time.  I know with
net-snmp you can set the address/port you want it to listen on.  I
actually tried this, but then netmon failed, stating that SNMP wasn't
bound to localhost. I am having trouble when I fail the active
interface, I lose all SNMP status, instead of swapping to the other

Note we have already had to modify ping, traceroute, etc to bind in this
way.  Any way to do this in Netview.  Any suggestions would be greatly


             James Shanks
             Sent by:                  nv-l@lists.us.ibm.com
                                       Re: [nv-l] Monitoring nodes
             03/30/2005 12:55          ospf

             Please respond to

Custom daemons using the OVsnmp APIs?   I presume that you've done a lot
reading in the Programmer's Guide and especially the Programmer's
Reference about using these routines.  I can't say I quite follow what
you are trying to do with them, however.

In any case,  OVsnmpOpen uses the NetView SNMP database, the one you
maintain with xnmsnmpconf to obtain the peer address for the open.
Before opening the session it does an OVsnmpResolveConfEntry( ) to get
the IP
Address  or proxy address to use.   That means that if there's already
IP Address in the xnmsnmp cache, he'll use that one.  If there isn't
one, he'll try gethostbyname to determine one, and take the first one he
gets back.

So, offhand, my advice would be to trying clearing the xnmsnmpconf cache
before you establish your session.  That would force a re-evaluation.
could even dump it and see what it contains.   But if that doesn't do
then the issue has to be name resolution.


James Shanks
Level 3 Support  for Tivoli NetView for UNIX and Windows
Tivoli Software / IBM Software Group

             Sent by:
             owner-nv-l@lists.         nv-l@lists.us.ibm.com

             03/29/2005 04:07          [nv-l] Monitoring nodes running
             PM                        ospf

             Please respond to

I have a small network with ~ 12 boxes.  Each box consists on 2 Ethernet
ports, and then a 3rd "virtual" interface, with ospf running on each
box. My problem is with several custom polling daemons that status MIB
variables on these various nodes.  I have each node defined in the host
file on the Netview box with the virtual IP.  The polling daemons use
Netview API calls
(OVsnmpOpen) to open an snmp session with each node using the virtual
IP/hostname.  The problem occurs during failures.  If I fail the active
interface on the remote box, the snmp polling responses timeout, and
don't switch over to the other route to the nodes  It seems as if the
snmp session binds to the active interface, rather than the virtual IP
that is defined.

Also, if I shutdown the active interface on the Netview box, I lose all
statuses from all nodes.  I am not sure if this is a Netview
configuration, a Netview API, or an snmp issue.  Any suggestions??

Is there a way to setup Netview to status (via SNMP)  multiple IP
addresses for the same node. Can a daemon/lrf be set up to respawn? I
could then have the session timeout, then respawn.


Jeff VanDenbussche
HNL Support
(609) 485-4200

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