This is a new redundancy mode for the Ethernet VPN (EVPN) architecture.

The Security Considerations are mostly a reference to the EVPN security considerations, as well as the document that defines BGP extensions for MPLS-based EVPN. Malicious misconfiguration of the router can result in various forms of denial of service. It seems to me that those are similar across the different redundancy modes, and therefore the Security Considerations look fine.