Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 170
Session state changes, BFD Three-way Handshake, BFD State Machine
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www.dell.com | support.dell.com handshake. At this point, the discriminator values have been exchanged, and the transmit intervals have been negotiated. 4. The passive system receives the control packet, changes its state to Up. Both systems agree that a session has been established. However, since both members must send a control packet-that requires a response-anytime there is a state change or change in a session parameter, the passive system sends a final response indicating the state change. After this, periodic control packets are exchanged. Figure 11-2. BFD Three-way Handshake Transmit Interval: User-configurable Default Session State: Down ACTIVE System Version: 1 Diag Code: 0 (assumes no previous session) State: Down Flag: P:1 Detect Multiplier: User-configurable My Discriminator: X ( Active System Session ID) Your Discriminator: 0 Desired Min TX Interval: User-configurable Required Min RX Interval: User-configurable Required Min Echo RX Interval: User-configurable Default Session State: Down PASSIVE System Version: 1 Diag Code: 0 (assumes no previous session) State: Up Flag: P: 1 Detect Multiplier: User-configurable My Discriminator: X Your Discriminator: Y Desired Min TX Interval: User-configurable Required Min RX Interval: User-configurable Required Min Echo RX Interval: User-configurable Version: 1 Diag Code: 0 (assumes no previous session) State: Up Flag: P: Clear Detect Multiplier: User-configurable My Discriminator: X Your Discriminator: Y Desired Min TX Interval: User-configurable Required Min RX Interval: User-configurable Required Min Echo RX Interval: User-configurable Steady Rate of Control Packets Init State Change Up State Change Up State Change Periodic Control Packet Version: 1 Diag Code: 0 (assumes no previous session) State: Init Flag: F: 1 Detect Multiplier: User-configurable My Discriminator: Y (Passsive System Session ID) Your Discriminator: X Desired Min TX Interval: User-configurable Required Min RX Interval: User-configurable Required Min Echo RX Interval: User-configurable Version: 1 Diag Code: 0 (assumes no previous session) State: Up Flag: F: 1 Detect Multiplier: User-configurable My Discriminator: Y Your Discriminator: X Desired Min TX Interval: User-configurable Required Min RX Interval: User-configurable Required Min Echo RX Interval: User-configurable fnC0036mp Session state changes Figure 11-3 shows how the session state on a system changes based on the status notification it receives from the remote system. For example, if a session on a system is down, and it receives a Down status notification from the remote system, the session state on the local system changes to Init. Figure 11-3. BFD State Machine current session state the packet received Up, Admin Down, Timer Down Init Down Down Admin Down, Timer Init Init, Up Admin Down, Down, Timer Up Up, Init 170 | Bidirectional Forwarding Detection
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