While using Network Flow Analysis to monitor your SD-WAN devices, you may notice an interface without SNMP information with an ifIndex of 4294967295 .
Component : NQRPTA - REPORTERANALYZER
Viptela and other SD-WAN devices may use interface 4294967295 as an aggregate for the Broadcast and Multicast data.
Due to how they aggregate the data, this is functioning as designed.