A customer is deploying a new application across two ACI pods that is sensitive to latency and jitter. The application sets the DSCP values of packets to AF31 and CS6, respectively. Which configuration changes must be made on the APIC to support the new application and prevent packets from being delayed or dropped between pods?
To ensure that the QoS levels are properly managed and that packets are not delayed or dropped when transmitted between ACI pods, it is crucial to align the ACI QoS levels with the IPN QoS policies. This alignment helps in maintaining consistent QoS treatment across the network, accommodating the different DSCP values set by the application (AF31 and CS6) and ensuring that the latency and jitter requirements of the application are met.
Translate policy has to be enabled. In order to preserve the proper QoS Level of the packet and avoid high priority packets from being delayed or dropped, you can use a DSCP translation policy for traffic that goes between multiple PODs connected by an IPN. Also Note For traffic passing through the IPN, do not map any DSCP values to CS6. Which leaves only C as viable answer. As you have to align QoS. as per ref:https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/kb/Cisco-APIC-and-QoS.html#id_34903
C. align the ACI QoS levels and IPN QoS policies In a Cisco ACI Multi-Pod deployment, when an application is sensitive to latency and jitter, it is critical to ensure that Quality of Service (QoS) policies are consistent between the ACI fabric and the Inter-Pod Network (IPN). This ensures that traffic marked with specific DSCP values (e.g., AF31 and CS6 in this case) is handled with the appropriate priority across the entire network path, preventing delays or packet drops.