TOI Author

Control Plane Policing (CoPP) classifies control plane traffic into different classes (e.g., IGMP, LLDP, PTP, OSPF) and applies rate limiting per class using queues shaping. However, when multiple flows within the same CoPP class share a single queue, a single high-rate flow can consume the entire allocated bandwidth for that class, starving other legitimate flows.

When a GRE tunnel is configured, and a GRE-encapped MPLS packet arrives on decap-groups, the traffic-class is derived based on the packet outer DSCP value. This feature aims to allow the user to derive the traffic-class based on the MPLS traffic-class from the payload of the IPv4 GRE packet, using the existing MPLS-exp to TC mapping defined in global QoS maps.