Multiple mac addresses from one interface?

Caporegime
Joined
12 Mar 2004
Posts
29,962
Location
England
So I have a Cisco 2550 switch fa0/1 connected to a Cisco 3560 switch fa0/3.

Now running the command "show mac-address-table" on the 3650 gives this:

Code:
Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
 All    0100.0ccc.cccc    STATIC      CPU
 All    0100.0ccc.cccd    STATIC      CPU
 All    0180.c200.0000    STATIC      CPU
 All    0180.c200.0001    STATIC      CPU
 All    0180.c200.0002    STATIC      CPU
 All    0180.c200.0003    STATIC      CPU
 All    0180.c200.0004    STATIC      CPU
 All    0180.c200.0005    STATIC      CPU
 All    0180.c200.0006    STATIC      CPU
 All    0180.c200.0007    STATIC      CPU
 All    0180.c200.0008    STATIC      CPU
 All    0180.c200.0009    STATIC      CPU
 All    0180.c200.000a    STATIC      CPU
 All    0180.c200.000b    STATIC      CPU
 All    0180.c200.000c    STATIC      CPU
 All    0180.c200.000d    STATIC      CPU
 All    0180.c200.000e    STATIC      CPU
 All    0180.c200.000f    STATIC      CPU
 All    0180.c200.0010    STATIC      CPU
 All    ffff.ffff.ffff    STATIC      CPU
   1    0017.9471.5a00    DYNAMIC     Fa0/3
   1    0017.9471.5a01    DYNAMIC     Fa0/3
   1    98de.d006.f88c    DYNAMIC     Fa0/1
Total Mac Addresses for this criterion: 23

Why is this? There is nothing else connected to the 2550 switch so I don't understand why the fa0/3 interface is learning 2 mac addresses?
 
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