Configuring the BFD Protocol (NSM Procedure)

The Bidirectional Forwarding Detection (BFD) protocol is used to detect the failures in a network. The BFD protocol is independent of the underlying transport mechanisms and layers; hence the failure detection timers for BFD have shorter time limits than the failure detection mechanisms of other protocols like OSPF and IS-IS. Each session of the BFD operates in two modes, asynchronous mode and demand mode. In asynchronous mode, both endpoints periodically send Hello packets to each other. If a number of those packets are not received, the session is considered down. In demand mode, no Hello packets are exchanged after the session is established; it is assumed that the endpoints have another way to verify connectivity to each other.

To configure BFD:

  1. In the navigation tree select Device Manager > Devices and select the device from the list.
  2. In the configuration tree, expand Protocols.
  3. Select Bfd.
  4. Add/Modify the parameters under the respective tabs as specified in Table 55.
  5. Click one:
    • OK—To save the changes.
    • Cancel—To cancel the modifications.
    • Apply — To apply the protocol settings.

Note: After you make changes to a device configuration, you must push that updated device configuration to the physical security device for those changes to take effect. You can update multiple devices at one time. See Updating Devices section in the Network and Security Manager Administration Guide for more information.

Table 55: Configuring Bfd Fields



Your Action


Specifies the comment for Bfd.

Enter the comment.


Enables you to define tracing operations that track all routing protocol functionality in the device. You can configure the tracing flag, filter, and the tracing policy.

  1. Expand the Bfd tree and select Traceoptions.
  2. Expand the Traceoptions tree and set up the file and flag parameters.