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no ifIndex mapping found when searching for a MAC

I have a program set up for the purpose of finding the port location of a given MAC address on the network; The core of this program base functionality comes from Cisco's "How To Get Dynamic CAM Entries (CAM Table) for Catalyst Switches Using SNMP" article (http://www.cisco.com/warp/public/477/SNMP/cam_snmp.shtml).

I have encountered a number of cases, however, where after retrieving the bridgePort mapping for a MAC address on a given switch, I find that there does not exist an ifIndex mapping for the stored bridgePort.

I am looking firstly to confirm why this would be, but more so to find out how to continue this search to be able to find the MAC in question when I am not returned an ifIndex.

I anyone could help me to resolve this it would be greatly appreciated.

Thanks in advance.

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