Root Cause and Impact Analysis

This section provides information on root cause and impact analysis for various events.

Below are the root-cause problem diagnosed and the impacted classes.

Table 1. Root-cause problems for VeloCloud classes

Class	Root cause	Event (symptoms) of root cause	Impacted Class	Events
VEdge	Down	VEdge ::VNFDown NetworkConnection::DownOrFlapping	VEdge	SpokeImpaired
			VEdge	VNFDown
			AppType	Impaired
			Tenant	Impaired
			NetworkConnection	DownOrFlapping
VGateway	Down	VGateway::VNFDown NetworkConnection::DownOrFlapping	VGateway	VNFDown
			NetworkConnection	DownOrFlapping
			Tenant	Impaired
			NonVCSiteRouter	ConnectivityLost/ReducedConnectivity
Interface	Down	Interface::DownOrFlapping NetworkConnection::DownOrFlapping	Tenant	Impaired
			NetworkConnection	DownOrFlapping
Router	Unresponsive	Router::Unreponsive NetworkConnection::DownOrFlapping	Tenant	Impaired
			NetworkConnection	DownOrFlapping

Note: The Interface Down and Router Unreponsive root causes scenarios are for the MPLS PE router interface and the PE Router that an Edge connects.

Root Cause and Impact Analysis – Edge Down

VCO Reports:

• Edge as down
• Edge link as unstable

Smarts Notifies:

• VNFDown event and Down problem as the root cause.
• Impaired event for the tenant.
• Impaired event for the Application types in the profile that is applied for the edge .
• SpokeEdgeImpaired event for all the spoke edges (if this edge that is down is configured as hub).

The Down problem shows the Tenant, AppType, and SpokeEdge Impaired events as Impacts.

Root Cause and Impact Analysis – Edge HA StandBy Down

VCO Reports : The Standby Edge in Active/StandBy HA as down. The Active Edge is up.

Smarts Notifies: HAReduced event.

There is no root cause or impact for this events.

Root Cause and Impact Analysis – Edge HA (Active/Active)

VCO Reports: Some/All of the edges in the edge cluster (Active/Active HA) goes down.

Smarts Notifies: One of the below events on the redundancy group depending on the number of edges that are down.

• AtRisk
• ReducedRedundancy
• AllComponentsDown

The redundancy group event is shown as the impact for the edge down.

Root Cause and Impact Analysis – Edge Hub Down

VCO Reports: Edge that is configured as hub is down.

Smarts Notifies:

• VNFDown event and Down problem as the root cause for the Edge that is reported as down.
• SpokeEdgeImpaired event for all the spoke edges

The SpokeEdgeImpaired event is shown as the impact for the Edge down.

Root Cause and Impact Analysis – Edge WAN link goes down

VCO Reports: The Edge WAN link as down.

Smarts Notifies:

• DownOrFlapping event and Down problem for the NetworkConnection as the root cause.
• Impaired event for the tenants .

The Down problem shows the Tenant Impaired and Network Connection DownOrFlapping as Impacts.

Root Cause and Impact Analysis – Edge/Gateway Admin down

VCO Reports: Edge/Gateway is not provisioned.

Smarts Notifies: NotActivated event.

There is no root cause or impact for this events.

Root Cause and Impact Analysis – Gateway down

VCO Reports : Gateways is reported as down.

Smarts Notifies:

• VNFDown event and Down problem as the root cause for the Gateway.
• Impaired event for the impacted tenant.

The Impaired event is shown as the impact for the Gateway down.

Root Cause and Impact Analysis – All Gateways for an Edge is down

VCO Reports:

• All the Gateways for an Edge is reported as down.
• All NetworkConnection for the Edge is reported as Down.

Smarts Notifies:

• VNFDown event and Down problem as the root cause for the Gateway.
• Impaired event for the impacted tenant.
• NetworkConnection DownOrFlapping event for the Edge links.

The Impaired and the DownOrFlapping events are shown as the impact for the Gateway down. This will appear as impact in both the Gateway Down problem.

Root Cause and Impact Analysis – Non VC site Gateway down

VCO Reports: One of the Gateways connecting to Non VC Site router is down.

Smarts Notifies:

• VNFDown event and Down problem as the root cause for the Gateway.
• ReducedConnectivity event for the NonVCSiteRouter.
• Impaired event for the impacted tenant.

The Impaired and ReducedConnectivity events are shown as the impact for the Gateway down.

Similar Impacts are shown when one of the NetworkConnections goes down with NetworkConnection Down as the root cause.

Root Cause and Impact Analysis – MPLS PE Router Down

VCO Reports: NetworkConnection Down.

Smarts Notifies:

• Router Down as root cause.
• NetworkConnection DownOrFlapping event.
• Impaired event for the impacted tenant.

The Impaired and DownOrFlapping events are shown as the impact for the Router down.

In this scenario, the VCO does not report Edge as down as it has a secondary link. But, if MPLS link is the only link then Edge VNFDown event will also come as impact. Edge Down will not be activated.

Note: This scenario needs configuration to stitch VC and MPLS Edge topology.

Root Cause and Impact Analysis – MPLS PE Interface Down/Disabled

VCO Reports: NetworkConnection down

Smarts Notifies:

• Interface Down/Disabled.
• NetworkConnection DownOrFlapping event.
• Impaired event for the impacted tenant.

The Impaired and DownOrFlapping events are shown as the impact for the Interface Down/Disabled.

In this scenario, the VCO does not report Edge as down as it has a secondary link. But, if MPLS link is the only link then Edge VNFDown event will also come as impact. Edge Down will not be activated.

Note: This scenario needs configuration to stitch VC and MPLS Edge topology.

Root Cause and Impact Analysis – MPLS Core Network Router Down

Smarts Notifies:

• MPLS Core Router Down as root cause.
• Tunnel Impaired.

The Impaired event is as the impact for the Router Down.

Note: This scenario needs configuration to stitch VC and MPLS Core topology. An Smarts MPLS server instance is also needed.

Root Cause and Impact Analysis – MPLS Core Network Interface Down

Smarts Notifies:

• Interface Down/Disabled
• Impaired event for the impacted Tunnel.

The Impaired event is shown as the impact for the Interface Down/Disabled.

Note: This scenario needs configuration to stitch VC and MPLS Core topology. An Smarts MPLS server instance is also needed.