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DES-7200 Configuration Guide Chapter 3 BFD Configuration
3-4
Figure-2 BFD Session Establishment
As the Figure-2 shows, two routers are connected via a L2 switch. OSPF and
BFD are running in the two routers at the same time. The BFD session
establishment process is:
Step 1: OSPF discovers neighbors and establish neighbor relationships.
Step 2: OSPF notifies BFD of establishing the session with the neighbors.
Step 3: BFD establishes the session with the neighbors.
Figure-3 BFD Fault Detection Process
As the Figure-3 shows, the BFD fault detection process is:
Step 1: A link communication failure between Router1 and Router2 occurs.
Step 2: BFD session between the Router1 and Router2 detects the fault.
Step 3: BFD notifies the fault of the OSPF reachability to the forwarding path of
the neighbor.
Step 4: OSPF deals with the process of the neighborDown. If the backup
forwarding path exists and the convergence is about to happen, the backup
forwarding path will be enabled.