Root-cause analysis

Root-cause problems for SDN classes and Root-cause problems for NSX-T classes table lists the root-cause problem diagnosed and the impacted classes.

Table 1. Root-cause problems for NSX-V classes

Class	Root-cause	Events (symptoms) of root cause	Impacted class	Events
ControllerNode	Down	ControllerDown	ControlCluster	ReducedRedundancy
				Down
				AtRisk
	APIServerDown	APIServerMightBeDown	ControlCluster	ReducedRedundancy
				Down
				AtRisk
EdgeGateway	Unresponsive	UnresponsiveSymptom	No impacted classes.	No events.
Hypervisor	Down	HypervisorPowerOff	VirtualMachine	MightBeUnreachable
				VMLostConnection
				Unreachable
			IP	Unresponsive
			Tunnel	Disconnected
			Hypervisor	HostLostConnectionToAtLeastOneDatastore
				HostLostConnection
	Disconnected	MightBeDisconnected	No impacted classes.	No events.
	ShutDown	HostShutdown	VirtualMachine	MightBeUnreachable
				VMLostConnection
				Unreachable
			IP	Unresponsive
			Tunnel	Disconnected
LogicalPort	Down	LinkDown	VirtualMachine	PoweredOff
				GuestOSNotRunning
				Unreachable
				MightBeUnreachable
	Disabled	AdminDown	VirtualMachine	PoweredOff
				GuestOSNotRunning
				Unreachable
				MightBeUnreachable
LogicalRouter	Unresponsive	UnresponsiveSymptom	No impacted classes.	No events.
VirtualMachine	PoweredOff	PoweredOffE	LogicalRouter	AtRisk
				Unresponsive
			EdgeGateway	AtRisk
				Unresponsive
	Unreachable	MightBeUnreachable	No impacted classes.	No events.

Table 2. Root-cause problems for NSX-T classes

Class	Root-cause	Events (symptoms) of root cause	Impacted class	Events
Host	Down	ESX host Down hosting Edge Node	EdgeCluster	ReducedRedundancy AllComponentsDown AtRisk ExternalTrafficImpaired
			EdgeNode	Down
			VIrtualMachine	DownOrImpaired
			Hypervisor	Down
			Tunnel	Down Disconnected
			TransportNode	Down
			LogicalRouter	LogicalRouterDown
Host	Down	ESX host Down hosting compute VMs	VIrtualMachine	DownOrImpaired /
			Hypervisor	Down
			Tunnel	Down Disconnected
			TransportNode	Down
			VmKernelPort	IfLostConnection
Interface	Down	ESX host Interface DOWN (Carrying Tunnel Traffic)	VirtualMachine	DownOrImpaired
			Tunnel	Down/TunnelTrafficImpaired Disconnected
			TransportNode	Down
			VmKernelPort	IfLostConnection/IfDown
			Tenant	EastWestTrafficImpaired Note: This event is generated only when VIO and NSX-T both discovered.
			LogicalSwitch	ConnectivityImpaired
Cable	Down	Cable (Connected to Compute Hypervisor Host) carrying tunnel traffic DOWN	VirtualMachine	DownOrImpaired
			Tunnel	Down/TunnelTrafficImpaired Disconnected
			TransportNode	Down
			VmKernelPort	IfLostConnection/IfDown
			Tenant	EastWestTrafficImpaired Note: This event is generated only when VIO and NSX-T both discovered.
			LogicalSwitch	ConnectivityImpaired
Interface	Down	ESX host hosting Edge Nodes Interface DOWN (Carrying External/Tunnel Traffic)	VirtualMachine	DownOrImpaired
			Tunnel	Down Disconnected
			TransportNode	Down
			VmKernelPort	IfLostConnection/IfDown
			Tenant	EastWestTrafficImpaired Note: This event is generated only when VIO and NSX-T both discovered.
			LogicalSwitch	ConnectivityImpaired
			EdgeNode	Down
			EdgeCluster	ExternalTrafficDown/ ExternalTrafficImpaired/TunnelTrafficDown
Cable	Down	Cable(Connected to Edge HypervisorHost) carrying tunnel/External traffic DOWN	VirtualMachine	DownOrImpaired
			Tunnel	Down Disconnected
			TransportNode	Down
			VmKernelPort	IfLostConnection/IfDown
			Tenant	EastWestTrafficImpaired Note: This event is generated only when VIO and NSX-T both discovered.
			LogicalSwitch	ConnectivityImpaired
			EdgeNode	Down
			EdgeCluster	ExternalTrafficDown/ ExternalTrafficImpaired/TunnelTrafficDown
Switch	Down	Switch (Directly connected to Compute Hypervisor) Down	VirtualMachine	DownOrImpaired
			VmKernelPort	IfLostConnection/IfDown
			Tunnel	Down Disconnected
			Tenant	EastWestTrafficImpaired Note: This event is generated only when VIO and NSX-T both discovered.
			LogicalSwitch	ConnectivityImpaired
Switch	Down	Switch (Directly connected to Edge Hypervisor) Down	VirtualMachine	DownOrImpaired
			LogicalRouter	LogicalRouterDown
			Host (compute VM)	Unresponsive
			EdgeNode	Down
			EdgeCluster	AllComponentsDown/ExternalTrafficDown/ ExternalTrafficImpaired/TunnelTrafficDown
TrunkCable	Down	Trunk cable Carrying tunnel Traffic Down	Tunnel	Down Disconnected
			LogicalSwitch	ConnectivityImpaired
Host	Down	ESX host DOWN hosting NSX-T manager	NSXManager	Unreachable
			VirtualMachine	DownOrImpaired
			Hypervisor	Down
VIrtualMachine	Down	VirtualMachine hosting Edge is Down	LogicalRouter	LogicalRouterDown
			EdgeNode	Down
			Tunnel	Disconnected, Down
VIrtualMachine	PoweredOff	VirtualMachine hosting ControllerNode is PoweredOff	ControllerNode	Down
			ControllerCluster	ReducedRedundancy AllComponentsDown AtRisk