Cisco IOS Devices displaying incorrect Serial_Number value in Spectrum.
Cisco IOS v16.3.5 the chassid value is populated with incorrect value (hostname instead of serial#)
Release : 10.4.x+
Component : Spectrum Core / SpectroSERVER
Upgrade Devices running Cisco IOS from 16.3.5 to 16.3.5b+
If the above is not possible craft a global collection(s) for the problem devices and use policy manager to map the DeviceSeriaAttr value to an attribute that provides the expected data on these devices.