Final answer:
To propagate multiple paths in SD-WAN or ADVPN, 'c) Enable BGP Multipath' should be configured. This feature allows multiple paths for the same prefix, enhancing redundancy and load-sharing capabilities in a network.
Step-by-step explanation:
To allow Route Reflector (RR) to propagate more than one path in SD-WAN or ADVPN scenarios, the correct approach would typically be to enable BGP Multipath. This feature, often represented as 'c) Enable BGP Multipath,' allows the advertisement of multiple paths for the same prefix without the router having to select a single best path. This is particularly useful in SD-WAN environments where having multiple paths can enhance redundancy and load sharing.
In configuring BGP Multipath, it is important to ensure that the configuration aligns with your network design and that all the prerequisite conditions for BGP Multipath are met, including path attributes such as AS_Path, Next-Hop, and MED being equal. The actual steps to configure BGP Multipath may vary depending on the specific network equipment and software being used. It's also crucial to remember that BGP is a complex protocol, and changes to its configuration should be done with a thorough understanding of the potential impact on the network.