Example of trunk cable down

In this example, a trunk cable between two routers that are running OSPF services goes down. The example assumes that the trunk cable connects two physical interfaces that each have one OSPF interface, which means that the trunk cable supports one OSPF neighbor relationship.

In this example, IP Availability Manager:

• Diagnoses a TrunkCable Down problem.

• Generates a TrunkCable DownOrFlapping event as an impact of the TrunkCable Down problem.

• Exports the TrunkCable Down problem and the TrunkCable DownOrFlapping event to the Global Manager.

• Exports a TrunkCable DownOrFlapping event-type status to Network Protocol Manager for OSPF.

  Network Protocol Manager for OSPF:

• Receives the TrunkCable DownOrFlapping event-type status from IP Availability Manager.

• Detects an alarming OSPF neighbor relationship for which the TrunkCable DownOrFlapping event-type status is associated with the two physical interfaces that are underlying the alarming OSPF neighbor relationship.

  As indicated in GUID-3D72A9D4-A9A0-41E6-91ED-E5CDE05D2E98.html#GUID-3D72A9D4-A9A0-41E6-91ED-E5CDE05D2E98___NPM_OSPF_USER_CROSS_COR_EVENT_79289, Network Protocol Manager for OSPF perceives the TrunkCable DownOrFlapping event-type status as a problem-type status.

  Network Protocol Manager for OSPF then:

• Generates an OSPFNeighborRelationship NeighborStateAlarm event.

• Generates a TrunkCable DownOrFlapping problem.

• Correlates the OSPFNeighborRelationship NeighborStateAlarm event with the TrunkCable DownOrFlapping problem and marks the event as an impact of the problem.

• Exports the TrunkCable DownOrFlapping problem and the OSPFNeighborRelationship NeighborStateAlarm event to the Global Manager.

  The Global Manager:

• Receives the TrunkCable Down problem and the TrunkCable DownOrFlapping event from IP Availability Manager.

• Receives the TrunkCable DownOrFlapping problem and the OSPFNeighborRelationship NeighborStateAlarm event from Network Protocol Manager for OSPF.

• Combines the TrunkCable DownOrFlapping event from IP Availability Manager with the TrunkCable DownOrFlapping problem from Network Protocol Manager for OSPF to form one notification that has two sources.

• Associates the TrunkCable DownOrFlapping notification as an impact of the TrunkCable Down notification.

• Associates the OSPFNeighborRelationship NeighborStateAlarm notification from Network Protocol Manager for OSPF as an impact of the TrunkCable Down notification.

  What follows is a summary of the notifications that are created for the TrunkCable Down problem, followed by a display in Notification Properties dialog box that shows a TrunkCable Down problem that shows how the Global Manager associates the network and OSPF events as impacts of the TrunkCable Down problem:

• IP Availability Manager events:

• Problem: TrunkCable Down

• Event (impact): TrunkCable DownOrFlapping

• Network Protocol Manager for OSPF events:

• Problem: TrunkCable DownOrFlapping

• Event (impact): OSPFNeighborRelationship NeighborStateAlarm

• Global Manager notifications:

• Root cause: TrunkCable Down

• Impacts: TrunkCable DownOrFlapping and

•      OSPFNeighborRelationship NeighborStateAlarm

  Figure 1. Notification Properties dialog box that shows a TrunkCable Down problem

  

  Chapter 2, Viewing OSPF Analysis Results and Topology, provides instructions on viewing detailed notification information.