The statement that MP-BGP is used for customer multicast group signaling is misleading and therefore considered false in this context. While the exhibit shows C-Mcast Signaling: BGP, this refers to the mechanism used between PE routers to advertise customer multicast (C-multicast) state across the provider's core. The actual signaling for group membership originating from the customer's network (from CE to PE) is typically done using PIM or IGMP. The PE router learns the customer's multicast state via these protocols and then uses MP-BGP to propagate this information to other PEs. Therefore, BGP is not the originating signaling protocol for customer groups, but rather a transport for that state information between PEs.

A. This is true. The exhibit output explicitly shows I-PMSI Tunnel: GRE and S-PMSI Tunnel: GRE, indicating both use GRE tunnels.

B. This is true. The exhibit clearly states I-PMSI Auto-Discovery: BGP and S-PMSI Auto-Discovery: BGP.

D. This is true. The exhibit line S-PMSI Group Address directly shows the configured range as 232.10.10.0/24.

1. Nokia 7750 SR OS Services Guide, Release 21.10.R1, Section: BGP-MVPN for VPLS.

Reference: "The PE routers run an instance of PIM or IGMP snooping that learns of C-multicast streams and receivers that are active in the VPLS. This information is then advertised by BGP to all other PE routers that are part of the same VPLS service."

Comment: This official documentation distinguishes between the learning of customer multicast state (via PIM/IGMP) and the advertisement of that state between PEs (via BGP), supporting the reasoning that BGP is not the originating signaling protocol.

2. RFC 6514: BGP Encodings and Procedures for Multicast in MPLS/BGP IP VPNs, Section 5: C-Multicast Routing.

Reference: "When a PE router that is attached to a particular VPN site learns, via a C-PIM instance, of a multicast source that is active within that site, it may originate a BGP update containing a C-multicast route."

Comment: This IETF standard, which defines BGP-MVPN, clarifies that the PE router learns of customer multicast activity via a Customer-PIM (C-PIM) instance and then originates a BGP update. This confirms that PIM is the customer-facing signaling protocol, while BGP is used for inter-PE communication.