Example of physical interface down

In this example, a physical interface on a router that is running a BGP service goes down. The example assumes that the physical interface has one BGP protocol endpoint, which means that the physical interface supports one BGP session.

In this example, IP Availability Manager:

• Diagnoses an Interface Down problem.

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

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

• Exports an Interface Down problem-type status and a NetworkConnection DownOrFlapping event-type status to Network Protocol Manager for BGP.

  Network Protocol Manager for BGP:

• Receives the Interface Down problem-type status and the NetworkConnection DownOrFlapping event-type status from IP Availability Manager.

• Detects a disconnected BGP session for which the Interface Down problem-type status is associated with one of the physical interfaces that is underlying the disconnected BGP session.

  Network Protocol Manager for BGPthen:

• Generates a BGPSession Disconnected event.

• Generates an Interface Down problem.

• Correlates the BGPSession Disconnected event with the Interface Down problem and marks the event as an impact of the problem.

• Exports the Interface Down problem and the BGPSession Disconnected event to the Global Manager.

  The Global Manager:

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

• Receives the Interface Down problem and the BGPSession Disconnected event from Network Protocol Manager for BGP.

• Combines the Interface Down problem from both IP Availability Managerand Network Protocol Manager for BGPto form one notification that has two sources.

• Associates the NetworkConnection DownOrFlapping notification from IP Availability Manageras an impact of the Interface Down notification.

• Associates the BGPSession Disconnected notification from Network Protocol Manager for BGPas an impact of the Interface Down notification.

  What follows is a summary of the notifications that are created for the Interface Down problem, followed by a display in Notification Properties dialog box that shows an Interface Down problemthat shows how the Global Managerassociates the network and BGP events as impacts of the Interface Down problem:

• IP Availability Managerevents:

• Problem: Interface Down

• Event (impact): NetworkConnection DownOrFlapping

• Network Protocol Manager for BGPevents:

• Problem: Interface Down

• Event (impact): BGPSession Disconnected

• Global Managernotifications:

• Root cause: Interface Down

• Impacts: NetworkConnection DownOrFlapping and BGPSession Disconnected

  Figure 1. Notification Properties dialog box that shows an Interface Down problem

  

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