nv-l

Re: [nv-l] Switch Analyzer and Enterasys Switches

2005-05-10 12:35:26
Subject: Re: [nv-l] Switch Analyzer and Enterasys Switches
From: Francois Le Hir <flehir AT ca.ibm DOT com>
To: nv-l AT lists.us.ibm DOT com
Date: Tue, 10 May 2005 12:27:59 -0400
Please let us know when this troubleshooting guide 2.0 is available.

Thanks,
Salutations, / Regards,

Francois Le Hir
Network Projects & Consulting Services
IBM Global Services
Phone: (514) 964 2145


                                                                       
             Michael Webb                                              
             <mlwebb AT us.ibm DOT co                                         
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                                       Re: [nv-l] Switch Analyzer and  
             05/10/2005 09:34          Enterasys Switches              
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Ok. Now you will probably have to go through the task of resolving problems
found in the Summary Report. Change directories to \usr\ov\itsl2\bin and
run this command (and redirect it to a file).

ITSL2_reports ?r summary

You will need to resolve the problems found in this report, especially for
those devices directly attached to the switch you are investigating.

I will send you the ITSA Troubleshooting Guide v1.0 that was put together
for ITSA v1.2.1. This will have some useful tips in troubleshooting
discovery issues. It will provide tips for resolving problems found in each
section of the Summary Report. The pdf file will be sent to
usman.taokeer AT s-iii DOT com.

I am currently working on the ITSA Troubleshooting Guide v2.0 that is being
put together for ITSA v1.3.

Michael Webb, IBM Tivoli
Q1CA NetView / ITSA SVT
Email: mlwebb AT us.ibm DOT com
Ext: (919) 224-1410, T/L: 687-1410
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                                                 Re: [nv-l] Switch     
                                                 Analyzer and Enterasys
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Webb,


Ok i did the snmpwalk thing, for the first query i.e snmpwalk ?c <community
string> <switch IP address> dot1dBridge. the output was fine it showed all
the ports. But for the second query the output was blank.. strange.. What
next? All the ports are active and UP.


~Usman



                                                                       
 Michael Webb                                                          
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                                                                   Subject
                                         Re: [nv-l] Switch Analyzer and
        Please respond to                Enterasys Switches            
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The accuracy and completeness of IBM Tivoli Switch Analyzer?s layer 2
discovery depends primarily on the availability of enough accurate
information accessible from the Bridge MIB forwarding tables and certain
private MIBs. The switch must support the RFC 1493 Bridge MIB, which is the
minimum requirement for switch management. So technically we support them
all if they, in turn, support the MIBs we need for discovery.

Switches that support multiple VLANs often require an additional SNMP
querying technique referred to as Community String Indexing (CSI). CSI is
used to support Cisco switches with multiple VLANs. Other vendor switches
that do not require CSI or access to private MIBs for VLAN support are also
supported.

For non-Cisco vendors requiring CSI, discovery is restricted to only those
ports in the default VLAN (usually VLAN 1). CSI is not supported in IBM
Tivoli Switch Analyzer for non-Cisco switch devices.

Now back to your situation in particular. You stated that the Layer-2
Physical view does not show all the nodes attached to that switch. I guess
this implies that some devices are attached to the switch in the Layer 2
Physical View. Correct?

Here is what you can try.

snmpwalk ?c <community string> <switch IP address> dot1dBridge

Do all of the active ports on the switch show up in this query? If not,
they you may have a non-Cisco switch that requires CSI (mentioned above).
You can verify this by querying the switch again as follows:

snmpwalk ?c <community [email protected]_ID> <switch IP address> dot1dBridge

Where VLAN_ID is an actual VLAN ID used by the switch. If you see ports in
this output that were not available in the previous output, then CSI is
required for this particular switch. However, ITSA does not support CSI for
non-Cisco switches at this time.

Please let me know the results.

Michael Webb, IBM Tivoli
Email: mlwebb AT us.ibm DOT com

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                                          [nv-l] Switch Analyzer and   
                                          Enterasys Switches           
                                                                       
                                                                       
                                                                       
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Hi,

We have NetView 7.1.4 FP3 on Windows2000. We have installed switch analyzer
on that. For some reason the switch analyzer is not showing some Layer-2
options it shows on a Cisco switch. Like the Layer-2 Physical view does not
shows all the nodes attached to that switch. Can any one help me out on
this. Do i need to load vendor specific MIBs to get that information? or
the Switch analyzer doesn't support Enterasys switches?


Regards,

Usman Taokeer
Associate Network Architect
Si3

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