Same Dynamic MAC address in all VLANs on Port-Channel

[chrismes]

I've a C9300 (L2) with Port-Channel to C9500.
WIth command "show mac address" I see the same dynamic CISCO MAC-address on all VLANs of this port-channel.
But when I look on the C9500 I do not see this MAC-address.
I've same configuration in our 2nd datacenter, where I do not see a MAC-address in all VLANs.
Where does this MAC-address come from?

1 3c8b.7f57.6cf7 DYNAMIC Po1
10 3c8b.7f57.6cf7 DYNAMIC Po1
20 3c8b.7f57.6cf7 DYNAMIC Po1
30 3c8b.7f57.6cf7 DYNAMIC Po1
40 3c8b.7f57.6cf7 DYNAMIC Po1
50 3c8b.7f57.6cf7 DYNAMIC Po1
60 3c8b.7f57.6cf7 DYNAMIC Po1
70 3c8b.7f57.6cf7 DYNAMIC Po1
80 3c8b.7f57.6cf7 DYNAMIC Po1
90 3c8b.7f57.6cf7 DYNAMIC Po1

OK, now I found, this is the MAC-address of the Port-Channel on the opposite switch C9500.
But on the same C9500 I have a Port-Channel to another C9300 (same IOS-version), but there this does not happen.

[M02@rt37]

Hello @chrismes,

MAC address you see on the Port-Channel in all VLANs on the C9300 switch, it is likely the MAC address of the Port-Channel itself. When a Port-Channel is formed, it is assigned a unique MAC address to identify it as a single logical interface in the L2 domain.

You say: "But on the same C9500 I have a Port-Channel to another C9300 (same IOS-version), but there this does not happen."

--What do you expected?