1
The active system sends a steady stream of control packets that indicates that its session state is Down,
until the passive system responds. These packets are sent at the desired transmit interval of the Active
system. The Your Discriminator field is set to zero.
2
When the passive system receives any of these control packets, it changes its session state to Init and
sends a response that indicates its state change. The response includes its session ID in the My
Discriminator field and the session ID of the remote system in the Your Discriminator field.
3
The active system receives the response from the passive system and changes its session state to Up. It
then sends a control packet indicating this state change. This is the third and final part of the handshake.
Now the discriminator values have been exchanged and the transmit intervals have been negotiated.
4
The passive system receives the control packet and changes its state to Up. Both systems agree that a
session has been established. However, because 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 14. BFD Three-Way Handshake State Changes
Bidirectional Forwarding Detection (BFD)
181
Summary of Contents for S4048T
Page 1: ...Dell Configuration Guide for the S4048T ON System 9 10 0 1 ...
Page 98: ... saveenv 7 Reload the system uBoot mode reset Management 98 ...
Page 113: ...Total CFM Pkts 10303 CCM Pkts 0 LBM Pkts 0 LTM Pkts 3 LBR Pkts 0 LTR Pkts 0 802 1ag 113 ...
Page 411: ...mode transit no disable Force10 Resilient Ring Protocol FRRP 411 ...
Page 590: ...Figure 67 Inspecting the LAG Configuration Link Aggregation Control Protocol LACP 590 ...
Page 646: ...Figure 87 Configuring Interfaces for MSDP Multicast Source Discovery Protocol MSDP 646 ...
Page 647: ...Figure 88 Configuring OSPF and BGP for MSDP Multicast Source Discovery Protocol MSDP 647 ...
Page 653: ...Figure 91 MSDP Default Peer Scenario 2 Multicast Source Discovery Protocol MSDP 653 ...
Page 654: ...Figure 92 MSDP Default Peer Scenario 3 Multicast Source Discovery Protocol MSDP 654 ...
Page 955: ...Figure 119 Single and Double Tag First byte TPID Match Service Provider Bridging 955 ...