NTP-based DF election for Ethernet segments

You can use the NTP-based designated forwarder (DF) election option to synchronize DF elections for multihomed Ethernet segments. This option supports existing DF election algorithms and aligns DF election timing across all devices in the segment. Use this feature to enhance network stability and performance by minimizing loops, duplicates, and traffic discarding. 

To enable this feature, configure the [df-election-ntp] option under the [protocol evpn] hierarchy. A newly defined BGP extended community with a time synchronization (T) bit communicates the Service Carving Time (SCT) for synchronized timing.