An EVPN Inclusive Multicast Ethernet Tag (IMET) route, or Route Type 3, is advertised by a VTEP to signal its membership in a broadcast domain for handling Broadcast, Unknown Unicast, and Multicast (BUM) traffic. According to RFC 7432, this route advertisement includes the originating VTEP's IP address, the Route Distinguisher (RD) of the EVPN Instance (EVI), and a PMSI Tunnel Attribute that carries the VNI. Receiving VTEPs collect these individual IMET routes from all participating peers to dynamically build their own local flooding list for ingress replication. The advertised route itself contains only a single entry for this list (the originator's IP), not the complete flooding list.

A. The VXLAN Network Identifier (VNI) is essential for identifying the broadcast domain. It is carried within the PMSI Tunnel Attribute of the IMET route advertisement.

C. The Route Distinguisher (RD) is a mandatory field in the IMET route's Network Layer Reachability Information (NLRI) to ensure the route is unique across the BGP domain for that specific MAC-VRF/EVI.

D. The IP address of the originating VTEP is explicitly included in the "Originating Router's IP Address" field of the IMET route NLRI.

1. RFC 7432: BGP MPLS-Based Ethernet VPN.

Section 7.3, "Inclusive Multicast Ethernet Tag Route": This section specifies the format of the Route Type 3 NLRI, which explicitly includes an 8-octet Route Distinguisher and the Originating Router's IP Address.

Section 8.3, "Ingress Replication": This section describes how the PMSI Tunnel Attribute is used with the IMET route. It states, "The PMSI Tunnel Attribute... MUST be attached to the Inclusive Multicast Ethernet Tag routes... The MPLS label in this attribute is the VNI." It also explains that a PE router builds its flooding list from the received IMET routes.

2. Nokia 7750 SR OS Services Guide, Release 21.10.R1, "EVPN-VXLAN".

In the section on "EVPN Route Types", the documentation for "Route Type 3: Inclusive Multicast Ethernet Tag (IMET) Route" confirms that the NLRI for the IMET route contains the configured route-distinguisher and the originating VTEP IP address, and that it carries the PMSI attribute which includes the VNI. This confirms that options A, C, and D are included in the route.