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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 string@VLAN_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@us.ibm.com
 usman.taokeer@s-iii.com
usman.taokeer@s-iii.com
Sent by: owner-nv-l@lists.us.ibm.com
05/10/2005 06:12 AM
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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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