If a multi-homed device or network is connected to two or more PEs through a set of Ethernet links, then that set of links is referred to as an Ethernet segment. The Ethernet segment route is also referred to as Route Type 4. This route is used for designated forwarder (DF) election for BUM traffic.
C
C - Type 4 Ethernet Segment Route, used for loop prevention and Designated Forwarder election. DF is the only device allowed to forward M'cast onto a dual-homed segment
B: ESI-label (identifies the source ESI) enables the split horizon mechanism so that BUM packets sent by CE to the non-DF, are not be looped back. ESI label that the DF advertised to the non-DF PE device in its autodiscovery route per Ethernet segment.
Ref.: https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-bgp-multihoming-overview.html#jd0e499
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