For Layer 2 VPNs and VPLS, if you configure the l2vpn-use-bgp-rules statement, you must configure a unique RD for each PE router participating in the routing instance.
For Ethernet VPN (EVPN), you must configure a unique RD for each PE router participating in the routing instance to ensure that the prefixes generated by different PEs are unique.
For other types of VPNs, we recommend that you use a unique RD for each provider edge (PE) router participating in specific routing instance. Although you can use the same RD on all PE routers for the same VPN routing instance, if you use a unique RD, you can determine the customer edge (CE) router from which a route originated within the VPN.
For Layer 2 VPNs and VPLSs, if you configure mesh groups, the RD in each mesh group must be unique.
https://www.juniper.net/documentation/us/en/software/junos/mpls/topics/ref/statement/route-distinguisher-edit-routing-instances-vp.html
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