When SVR-A in EPG-A/BD-A cannot reach SVR-B in EPG-B/BD-B, it's crucial to ensure that a contract exists between EPG-A and EPG-B that permits the traffic (Option A). Contracts in Cisco ACI act as a policy framework that dictates the types of traffic allowed between EPGs. Without an appropriate contract, traffic will not be allowed to pass between these entities.
Additionally, verifying that SVR-B is learned as an endpoint in EPG-B from Node-112 (Option C) is essential.
Endpoint learning within ACI is a process where the leaf switch learns about the endpoints connected to it. If Node-112 has not learned SVR-B as an endpoint, it will not be able to forward traffic to it, resulting in connectivity issues.
References: = For more information on contracts and endpoint learning, refer to the Cisco ACI documentation on the Cisco official website. Specifically, look into sections detailing ACI contracts and endpoint learning processes.