Simplified configuration for ESI LAGs with EVPN dual homing (EZ-LAG)

We support a new CLI statement hierarchy level, [edit services evpn]. Using statements at this hierarchy level, you can specify the device attributes and other parameters to configure an Ethernet segment in an EVPN fabric. This new configuration simplifies setting up EVPN fabrics with Ethernet segment identifier (ESI) link aggregation groups (LAGs) for dual-homing peer provider edge (PE) devices. We call this feature EZ-LAG or easy EVPN LAG. When you commit a configuration at this hierarchy level, the device automatically invokes commit scripts to create a corresponding configuration on the device. You must specify some mandatory elements. You can also include optional elements. For optional elements that you don't specify, the automatic configuration scripts automatically derive the optional elements (or the scripts use default parameters). The resulting automatic configuration includes the applicable configuration stanzas corresponding to the different elements you specify at the [edit services evpn] hierarchy level. The new hierarchy includes options to override some defaults, and you can override auto-configured settings by manually configuring the related statements.