ECN: EVPN-VXLAN tunnels

Supported platforms that originate or terminate EVPN-VXLAN tunnels and have Explicit Congestion Notification (ECN) enabled automatically copy the ECN bits from the inner header to the outer header. The device copies the ECN bits from the outer header to the inner header if the inner header has the ECT bit set. If the device experiences congestion, it sets the CE bits if the ECT bit is enabled.

These devices support ECN copy operations in EVPN-VXLAN networks with an IPv4 underlay or an IPv6 underlay.