Sw Macaddress

When you are looking on which interface a particulair MacAdress is comming from you would log into the core switch and ping the host
then you would perform:

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
Switch>show ip arp
Protocol   Address                       Age (min)     Hardware Addr    Type  Interface
Internet                     0            0000.0000.0000  ARPA   VLAN677
Switch#show mac-address-table address 0000.0000.0000

vlan             mac-address            Type            Protocol                    Port
VLAN677          0000.0000.0000         dynamic         ip,other         GigabitEthernet5/2

This will show the interface it learned the ip-address from. Then you could trace the line to it's switch
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