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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Establishing a Session on Physical Ports

To establish a session, enable BFD at the interface level on both ends of the link, as shown in the following illustration. The configuration parameters do not need to match.

Figure 1. Establishing a BFD Session on Physical Ports Illustration of establishing a BFD session on physical ports.
  1. Enter interface mode. CONFIGURATION mode interface
  2. Assign an IP address to the interface if one is not already assigned. INTERFACE mode ip address ip-address
  3. Identify the neighbor that the interface participates with the BFD session. INTERFACE mode bfd neighbor ip-address

Example of Verifying Session Creation

To verify that the session is established, use the show bfd neighbors command.

The bold line shows the BFD session. 

R1(conf-if-gi-4/24)#do show bfd neighbors
                                 * - Active session role
                                 Ad Dn - Admin Down
                                 C - CLI
                                 I - ISIS
                                 O - OSPF
                                 R - Static Route (RTM)
                                 LocalAddr  RemoteAddr  Interface  State  Rx-int  Tx-int  Mult  Clients
                                 * 2.2.2.1  2.2.2.2     
                                 Gi 4/24    Up     200     200     3     C

To view specific information about BFD sessions, use the show bfd neighbors detail command. 

R1(conf-if-gi-4/24)#do show bfd neighbors detail
                                 
                                 Session Discriminator: 1
                                 Neighbor Discriminator: 1
                                 Local Addr: 2.2.2.1
                                 Local MAC Addr: 00:01:e8:09:c3:e5
                                 Remote Addr: 2.2.2.2
                                 Remote MAC Addr: 00:01:e8:06:95:a2
                                 Int: GigabitEthernet 4/24
                                 State: Up
                                 Configured parameters:
                                 TX: 200ms, RX: 200ms, Multiplier: 3
                                 Neighbor parameters:
                                 TX: 200ms, RX: 200ms, Multiplier: 3
                                 Actual parameters:
                                 TX: 200ms, RX: 200ms, Multiplier: 3
                                 Role: Active
                                 Delete session on Down: False
                                 Client Registered: CLI
                                 Uptime: 00:03:57
                                 Statistics:
                                 Number of packets received from neighbor: 1775
                                 Number of packets sent to neighbor: 1775
                                 Number of state changes: 1
                                 Number of messages from IFA about port state change: 0
                                 Number of messages communicated b/w Manager and Agent: 4

Log messages display when you configure both interfaces for BFD. 

     R1(conf-if-gi-4/24)#00:36:01: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to
                                 
                                 Down for neighbor 2.2.2.2 on interface Gi 4/24 (diag: 0)
                                 00:36:02: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to 
                                 Up for neighbor
                                 2.2.2.2 on interface Gi 4/24 (diag: 0)

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