Dear community members,
I have a pair of switches configured as a single Port Channel using vPC. However, I am facing an issue where packets from the same flow (same source/destination IP and port) arriving at each switch are being forwarded through different output interfaces while the configuration is consistent (load balancing by src-dst ip-l4port with symmetric option and a same rotate value). For example:
This behavior is not desirable in my scenario. I need each flow, even if its packets arrive at different switches from outside of my network, to always exit through the same interface to ensure a consistent path within my network.
Since both switches use the same PO hashing algorithm (ip-l4port with the same rotate value), I suspect the port-channel internal dynamic load balancing might be influencing this behavior but I could not find any documentation on it. Could this be the root cause? Is there anyway I can ensure that each flow follows a single egress path? (I tried fixed hash distribution too. It could not solve the issue.)
Any guidance or best practices for handling this situation would be greatly appreciated.
