Hello!
I'm troubleshooting an issue and I found something interesting. I have the same MAC address on two different interfaces and VLANs. See below:
Displaying entries from active supervisor:
vlan mac address type learn age ports
----+----+---------------+-------+-----+----------+-----------------------------
* 17 0050.569a.1915 dynamic Yes 0 Te5/5
* 16 0050.569a.1915 dynamic Yes 5 Po31
I understand that when a switch learns a MAC, it will either delete the old entry if it's on a different port or VLAN or only update the timestamp if on the same interface or VLAN. However, this is no what I am seeing here.
One of these VLANs is an UNTRUST VLAN and one is a TRUST VLAN. There is a PaloAlto in the middle doing a vWire which I understand is just stitching together VLAN 16 and 17. I'm not sure why it was setup like this originally. Why would I see the same MAC on two different interfaces and VLANs?
My L3 device shows this:
IP ARP Table
Total number of entries: 1
Address Age MAC Address Interface
172.30.15.4 00:00:21 0050.569a.1915 Vlan17
That MAC is then learned on:
* 17 0050.569a.1915 dynamic ~~~ F F Eth5/9
This goes to a L2 switch which has the two MACs learned.
Are my devices drunk?!
