When you make a configuration change, NSX Manager typically sends a request to another component to implement the change. For some layer 3 entities, if you make the configuration change using the API, you can track the status of the request to see if the change is successfully implemented.

The configuration change that you initiate is called the desired state. The result of implementing the change is called the realized state. If NSX Manager implements the change successfully, the realized state will be the same as the desired state. If there is an error, the realized state will not be the same as the desired state.

For some layer 3 entities, when you call an API to make a configuration change, the response will include the parameter request_id. You can use the parameters request_id and the entity_id to make an API call to find out the status of the request.

This feature supports the following entities and APIs:
EdgeCluster
    POST /edge-clusters
    PUT /edge-clusters/<edge-cluster-id>
    DELETE /edge-clusters/<edge-cluster-id>
    POST /edge-clusters/<edge-cluster-id>?action=replace_transport_node

LogicalRouter
    POST /logical-routers
    PUT /logical-routers/<logical-router-id>
    DELETE /logical-routers/<logical-router-id>
    POST /logical-routers/<logical-router-id>?action=reprocess
    POST /logical-routers/<logical-router-id>?action=reallocate

LogicalRouterPort
    POST /logical-router-ports
    PUT /logical-router-ports/<logical-router-port-id>
    DELETE /logical-router-ports/<logical-router-port-id>

StaticRoute
    POST /logical-routers/<logical-router-id>/routing/static-routes
    PUT /logical-routers/<logical-router-id>/routing/static-routes/<static-route-id>
    DELETE /logical-routers/<logical-router-id>/routing/static-routes/<static-route-id>

BGPConfig
    PUT /logical-routers/<logical-router-id>/routing/bgp

BgpNeighbor
    POST /logical-routers/<logical-router-id>/routing/bgp/neighbors
    PUT /logical-routers/<logical-router-id>/routing/bgp/neighbors/<bgp-neighbor-id>
    DELETE /logical-routers/<logical-router-id>/routing/bgp/neighbors/<bgp-neighbor-id>
    POST /logical-routers/<logical-router-id>/routing/bgp/neighbors/<bgp-neighbor-id>

BGPCommunityList
    POST /logical-routers/<logical-router-id>/routing/bgp/community-lists
    PUT /logical-routers/<logical-router-id>/routing/bgp/community-lists/<community-list-id>
    DELETE /logical-routers/<logical-router-id>/routing/bgp/community-lists/<community-list-id>

AdvertisementConfig
    PUT /logical-routers/<logical-router-id>/routing/advertisement

AdvertiseRouteList
    PUT /logical-routers/<logical-router-id>/routing/advertisement/rules

NatRule
    POST /logical-routers/<logical-router-id>/nat/rules
    PUT /logical-routers/<logical-router-id>/nat/rules/<rule-id>
    DELETE /logical-routers/<logical-router-id>/nat/rules/<rule-id>

DhcpRelayService
    POST /dhcp/relays
    PUT /dhcp/relays/<relay-id>
    DELETE /dhcp/relays/<relay-id>

DhcpRelayProfile
    POST /dhcp/relay-profiles
    PUT /dhcp/relay-profiles/<relay-profile-id>
    DELETE /dhcp/relay-profiles/<relay-profile-id>

StaticHopBfdPeer
    POST /logical-routers/<logical-router-id>/routing/static-routes/bfd-peers
    PUT /logical-routers/<logical-router-id>/routing/static-routes/bfd-peers/<bfd-peers-id>
    DELETE /logical-routers/<logical-router-id>/routing/static-routes/bfd-peers/<bfd-peers-id>

IPPrefixList
    POST /logical-routers/<logical-router-id>/routing/ip-prefix-lists
    PUT /logical-routers/<logical-router-id>/routing/ip-prefix-lists/<ip-prefix-list-id>
    DELETE /logical-routers/<logical-router-id>/routing/ip-prefix-lists/<ip-prefix-list-id>

RouteMap
    POST /logical-routers/<logical-router-id>/routing/route-maps
    PUT /logical-routers/<logical-router-id>/routing/route-maps/<route-map-id>
    DELETE /logical-routers/<logical-router-id>/routing/route-maps/<route-map-id>

RedistributionConfig
    PUT /logical-routers/<logical-router-id>/routing/redistribution
RedistributionRuleList
    PUT /logical-routers/<logical-router-id>/routing/redistribution/rules

BfdConfig
    PUT /logical-routers/<logical-router-id>/routing/bfd-config

MplsConfig
    PUT /logical-routers/<logical-router-id>/routing/mpls

RoutingGlobalConfig
    PUT /logical-routers/<logical-router-id>/routing

IPSecVPNIKEProfile
    POST /vpn/ipsec/ike-profiles
    PUT /vpn/ipsec/ike-profiles/<ike-profile-id>
    DELETE /vpn/ipsec/ike-profiles/<ike-profile-id>

IPSecVPNDPDProfile
    POST /vpn/ipsec/dpd-profiles
    PUT /vpn/ipsec/dpd-profiles/<dpd-profile-id>
    DELETE /vpn/ipsec/dpd-profiles/<dpd-profile-id>

IPSecVPNTunnelProfile
    POST /vpn/ipsec/tunnel-profiles
    PUT /vpn/ipsec/tunnel-profiles/<tunnel-profile-id>
    DELETE /vpn/ipsec/tunnel-profiles/<tunnel-profile-id>

IPSecVPNLocalEndpoint
    POST /vpn/ipsec/local-endpoints
    PUT /vpn/ipsec/local-endpoints/<local-endpoint-id>
    DELETE /vpn/ipsec/local-endpoints/<local-endpoint-id>

IPSecVPNPeerEndpoint
    POST /vpn/ipsec/peer-endpoints
    PUT /vpn/ipsec/peer-endpoints/<peer-endpoint-id>
    DELETE /vpn/ipsec/peer-endpoints/<peer-endpoint-id>

IPSecVPNService
    POST /vpn/ipsec/services
    PUT /vpn/ipsec/services/<service-id>
    DELETE /vpn/ipsec/services/<service-id>

IPSecVPNSession
    POST /vpn/ipsec/sessions
    PUT /vpn/ipsec/sessions/<session-id>
    DELETE /vpn/ipsec/sessions/<session-id>
You can call the following APIs to get the realized states:
EdgeCluster
Request - GET /edge-clusters/<edge-cluster-id>/state?request_id=<request-id>
Response - An instance of EdgeClusterStateDto which will inherit ConfigurationState. If the edge cluster is deleted then the state will be unknown and it will return the common entity not found error.

LogicalRouter / All L3 Entites - All L3 entities can use this API to get realization state
Request - GET /logical-routers/<logical-router-id>/state?request_id=<request-id>
Response - An instance of LogicalRouterStateDto which will inherit ConfigurationState. Delete operation of any entity other than logical router can be covered by getting the state of logical router but if the logical router itself is deleted then the state will be unknown and it will return the common entity not found error.

LogicalServiceRouterCluster - All L3 entities which are the part of services can use this API to get the realization state
Request - GET /logical-routers/<logical-router-id>/service-cluster/state?request_id=<request-id>
Response - An instance of LogicalServiceRouterClusterState which will inherit ConfigurationState. 

LogicalRouterPort / DhcpRelayService / DhcpRelayProfile
Request - GET /logical-router-ports/<logical-router-port-id>/state?request_id=<request-id>
Response - An instance of LogicalRouterPortStateDto which will inherit ConfigurationState. 

IPSecVPNIKEProfile / IPSecVPNDPDProfile / IPSecVPNTunnelProfile / IPSecVPNLocalEndpoint / IPSecVPNPeerEndpoint / IPSecVPNService / IPSecVPNSession
Request - GET /vpn/ipsec/sessions/<session-id>/state?request_id=<request-id>
Response - An instance of IPSecVPNSessionStateDto which will inherit ConfigurationState. If the session is deleted then the state will be unknown and it will return the common entity not found error. When IPSecVPNService is disabled, IKE itself is down and it does not respond. It will return unknown state in such a case.

For more information about the APIs, see the NSX-T Data Center API Reference.