RE: [nv-l] Switch Analyzer and Layer 3 switches

[Oliver Bruchhaeuser <oliver.bruchhaeuser@de.ibm.com>]

Chris,

is your switch in the "ovtopodump
-X" output?
If not ... what is the value for "
Layer 2 OID" in the "ovtopodump -X <switch>" output?
I assume something like ".... (node
is a gateway)".
If so ... is your switch in the topo
db as a router:
ovtopodump -v <switch> | grep
"^DOES IP FORWARDING:"
If so ... does your switch reports this
per SNMP:
snmpget <switch> ip.ipForwarding.0

If so .... The actual version of ITSA
will not handle Routers as Layer2 devices.

If you cannot disable routing on the
device .... only one idea .... have you tried to block snmp access to "ip.ipForwarding.0"
with an access list?
You may be able to fool NetView and
so ITSA.

Oliver

"Federico Vidal" <fvidal@tecsystem.com.ar>
Sent by: owner-nv-l@lists.us.ibm.com

22.04.2004 17:54

Please respond to
nv-l

To	<nv-l@lists.us.ibm.com>
cc
Subject	RE: [nv-l] Switch Analyzer and Layer 3 switches

Christopher,
 
ONE of the means by which netview
determines a device to be a router is if it has the ipforwarding mib value
to true (1).
Disabling routing may turn it
to false.
 
Have you then tried itsa's importoid
command?
 
Federico Vidal
 
 
 -----Mensaje original-----
De: Christopher J Petrina [mailto:cjp8@meadwestvaco.com]
Enviado el: Thursday, April 22, 2004 4:28 PM
Para: nv-l@lists.us.ibm.com
Asunto: [nv-l] Switch Analyzer and Layer 3 switches


Greetings all, 

The subject is ominous but here is my situation. 

We haev some Alcatel 5024's.  These devices by default have some built
in routing capabilites.  As such they contain a routing table where
populated or not it is still there,  however these devices are trully
only being used as a layer2 switch; but Switch Analyzer is not recognizing
them as such.  The reason I found out from Magnum is that One of the
means by which netview determines a device to be a router is if it contains
a routing table.  Well the moment it finds the table ont hese devices
it calls it a router and switch analyzer will not attempt to do any layer2
discovery on it. 
   My question is, is there a way to override Netviews discovery and
force these devices to show as layer2 devices only?  In the oid_to_type
this particular device is listed as a HB (Hub Bridge) with no mention of
G(gateway). 

Thanks 
Chris Petrina 

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