Where does the Cisco V-Edge Router perform QOS traffic classification?

The Cisco V-Edge Router performs QoS traffic classification on the ingress interface, before the traffic enters the VPN. The classification is based on the match criteria specified in the access lists, which can include the source and destination IP addresses, ports, protocols, DSCP values, and application-aware NBAR attributes. The classification results in assigning a forwarding class and a QoS group to each packet. The forwarding class determines the output queue and the scheduling policy for the packet on the egress interface. The QoS group is an internal label that can be used to remark the DSCP value of the packet or to match the packet in another access list for further processing. References:

: Forwarding and QoS Configuration Guide for vEdge Routers, Cisco SD-WAN Release 20, Chapter 2: Configuring Localized Data Policy, https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/qos/vEdge-20-x/qos-book/localized-data-policy.html#id_105059 1

: Cisco SD-WAN Design Guide, Release 20, Chapter 6: Quality of Service, https://www.cisco.com/c/en/us/td/docs/solutions/CVD/SDWAN/2020/b_SD-WAN_Design_Guide_Aug_2020/b_SD-WAN_Design_Guide_Aug_2020_chapter_0110.html 2