04-17-2019 05:56 PM
I am facing authentication issue on ISE but meanwhile, I have noticed one more issue and I guess because of that, I have an authentication issue on ISE. I have Cisco Catalyst 3850 switch when I hit the sh mac address-table command, it shows me same mac address twice.
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
377 2c44.fd2f.9471 DYNAMIC Gix/x/x
377 707c.6901.277a DYNAMIC Gix/x/x
256 707c.6901.277a STATIC Gix/x/x
Could someone have any idea on this? Why it is showing me the same mac address twice on the interface as a static and dynamic. It is a common phone and pc arrangement on the switch port.
04-17-2019 06:18 PM
04-22-2019 09:27 PM
See if this post helps you. Difference between static and dynamic MAC.
https://community.cisco.com/t5/switching/mac-address-dynamic-and-static/td-p/1660466
This post belongs to the switching community where you can get answers.
-Krishnan
04-23-2019 06:55 AM
Hello,
You are seeing the mac address learned in two different vlans. I assume vlan 377 is your data vlan and vlan 256 is your voice vlan.
It is not uncommon for phones to reach out in the data vlan before they learn what the voice vlan is from the switch. This is probably expected behavior.
Hope that helps!
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