Symptom

Switches configured with IPDT, or using a feature that relies on IPDT (such as DHCP Snooping) may not learn IPv6 Addresses correctly in the Device-Tracking Database. Additionally, the Ethernet Source MAC address of the IPDT Probe may be incorrect (using a non-existent MAC, rather than the SMAC of the physical interface)

Conditions

Seen on 3850 running 16.8.1, and 16.6.1-3

Workaround

Creating an SVI, even if shutdown, will resolve the incorrect MAC address issue. With this, the probe should be sourced from the SVI MAC Issue is resolved in 16.6.4

Further Problem Description