Technical Tip: Locate Ports that have Multiple MAC Addresses

Description

Solution

1. Go to adapter view and search with a * in the search field.
   This will list all adapters in the network (Warning this could be a lot)
   
   
2. Select the location column to sort on that column
   
   
3. Export the list to Excel.
   
   
4. Select Adapter - Location and Adapter - Physical Address for the columns desired to be exported (add other columns as needed).
   
   
5. Sort through or use an excel function to take out all single mac address entries.
   
   

Example below shows 2 addresses on one port.

3Com Switch GigabitEthernet1/0/17 { GigabitEthernet1/0/17 Interface } 00:1A:4B:6C:55:AD
3Com Switch GigabitEthernet1/0/17 { GigabitEthernet1/0/17 Interface } 00:18:8B:BB:1E:D2