MC-LAG emulation in an EVPN deployment

You can emulate the function of an MC-LAG in active-standby mode in an EVPN configuration without having to configure an ICCP or ICL interface. In a standard EVPN configuration, logical interfaces configured on an aggregated Ethernet interface can have different designated forwarder election roles. To emulate an MC-LAG configuration, the designated forwarder (DF) takes on the role of the aggregated Ethernet interface. The provider edge (PE) that is the non-DF will send LACP out-of-sync packets to the CE. This causes LACP to go down on the CE device, and the CE device does not use the links connected to the non-DF for sending traffic. If the connection between a CE and a DF PE fails, the PE is re-elected as a DF. If the connection between a CE and a non-DF PE fails, the current DF PE is not changed. To enable this functionality, configure the lacp-oos-on-ndf statement at the [edit interfaces interface name esi df-election-granularity per-esi] hierarchy.