EVPN
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Support for DHCP Option 82 over EVPN (ACX Series)—Starting in Junos OS Release 21.2R1, Option 82 flags are inserted in the DHCP packets to enhance security when the packet is sent to the server. The provider edge (PE) router that is part of the EVPN instance acts as the relay agent, and adds these flags to the DHCP packets.
DHCPv4 packet relay and DHCPv6 packet relay use this process. With the introduction of EVPN IRB, the relay agent uses the IRB interface with EVPN for forwarding the requests, and for replies to and from the client or the server instead of using the default routing option. If one PE router fails, an appropriate DHCPv6-PD state is made available for the remaining PE routers participating in the DHCP-PD process for the VLAN. This is done using automatic synchronization of DHCPv6-PD states between multiple PE routers that are connected to the same Ethernet segment identifier (ESI) through EVPN BGP messages.
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Support for DHCPv6-PD on EVPN IRB synchronization among multiple PE routers (ACX Series)—You can use DHCPv6 prefix delegation (DHCPv6-PD) to automate the delegation of IPv6 prefixes to a requesting router on EVPN IRB. DHCPv6 prefix delegation is configured on EVPN IRB, and provides IPv6 prefixes to the requesting clients instead of a unique address. The DHCPv6-PD server acts as a provider edge (PE) router that provides the delegates through the relay (PE router) operating in the EVPN instance.
If one PE router fails, an appropriate DHCPv6-PD state is made available for the remaining PE routers participating in the DHCP-PD process for the VLAN. This is done using automatic synchronization of DHCPv6-PD states between multiple PE routers that are connected to the same Ethernet segment identifier (ESI) through EVPN BGP messages.