Hi Victor.
Is it for all addresses or only for some?
This happens with every address (IP/MAC) I've tried to find.
What switches you are using in your network?
Cisco Nexus n5000, Cisco Nexus 1010, Cisco Nexus 1000, Cisco Catalyst 4500, Cisco Catalyst s72033, Cisco Catalyst C3750E, Cisco Catalyst C3500XL, Cisco 2801, Cisco Catalyst c6sup2_rp, Cisco Catalyst C2950, Cisco Catalyst C2970, Cisco Catalyst CBS31X0, HP Procurve 2810-24G, HP Procurve 1810G, HP Procurve 2910al-48G, HP Procurve 2650, HP Procurve 2824, etc.
Is it possible to read forwarding database from switches (Tools -> Info -> Switch forwarding database)?
Yes for:
Cisco Catalyst s72033 (only 1 interface to several)
Cisco Catalyst C3750E (only 2 interfaces to several)
Cisco Nexus 1000 (only 1 interface to several)
Cisco Catalyst C2970 (only 1 interface to several)
Cisco Catalyst C3500XL
HP Procurve 2810-24G
HP Procurve 1810G
HP Procurve 2910al-48G
HP Procurve 2650
HP Procurve 2824
Best regards.