search

sonic-net / DASH

Disaggregated APIs for SONiC Hosts
Apache License 2.0
78 stars 88 forks source link

[doc] Add flow reconcile APIs in the HA session API. #549

Closed r12f closed 2 months ago

r12f commented 3 months ago

The flow reconcile API is for helping unplanned failover to avoid SDN policy going backwards.

Basically, whenever the DPU/ENI enters a role that does flow decision from a role that doesn't do it. It needs to stop flow resimulation for existing flows, even upon request. Until the flow reconcile request is called explicitly, when SDN controller confirms the latest policies are programmed, the flow resimulation can be resumed.

Because the flow reconcile goes with the DPU/ENI, the attributes are added on the HA scope level. Besides attributes, we also added an event notification for requesting flow reconcile from the DASH implementation.

r12f commented 2 months ago

hi @marian-pritsak , please let us know if you have any comments after you are back. we will get the HLD adjusted accordingly afterwards.