FailureDomain

Failure Domain is engineered to be isolated from failures in other failure domains, and to provide inexpensive, low-latency network connectivity to other failure domains in the same region. We support failure domain only on edge transport node. Like you can consider one rack as one failure domain and place active-standby contexts like logical router, DHCP and MDProxy in two different failure domains (racks). So failure of a single rack (FD) does not impact any services and other rack (FD) will continue to handle traffic. Initially system creates one default failure domain. For any edge transport node, if failure domains is not given, it will be mapped to default system generated failure domain. You can't update preferred_active_edge_services flag for system generated default failure domain. It will be unset which means that failure domain can be used for both active and standby allocation.