Bidirectional Forwarding Detection (BFD) hardware assist support provides the functionality to run a BFD session in hardware. Effective failure detection requires BFD to run at high frequencies (using aggressive timers as low as 3 ms), which was not possible in the Software Mode because of CPU and ExtremeXOS restrictions.
Starting with ExtremeXOS 30.5, BFD hardware assist supports multi-hop.
L2 topology convergence time might affect the BFD sessions running at the shortest interval.
Unconfiguring loopback for BFD disables the hardware assist support. The supported shortest interval is 3 ms in hardware mode.
Configure the port 1 as loopback port dedicated for BFD:
#configure bfd hardware-assist primary loopback-port 1
To check the number of BFD sessions supported in the hardware and configured loopback port:
#show bfd .. .. Hardware Assist Operational State : Enabled(Loopback port not configured) Hardware Assist Primary Loopback Port : 1 Hardware Assist Secondary Loopback Port : None Maximum # of Hardware Assist Sessions : 900
To find the session running the hardware:
#show bfd session detail Neighbor : 10.10.10.2 Local : 10.10.10.1 VR-Name : VR-Default Interface : v1 Session Type : Single Hop State : Down .. Hardware Assist : Yes
To see the hardware counters:
#show bfd counters #show bfd session 10.10.10.2 counters