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Download EPUBHardware Assisted Bidirectional Forwarding Detection (BFD)
The hardware assisted Bidirectional Forwarding Detection (BFD) feature expands on the existing ExtremeXOS BFD capabilities.
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 is not possible in the software mode because of CPU and ExtremeXOS restrictions.
To make BFD sessions run in the hardware, the following configuration is required.
- Unused front panel port (not available for switching the user data traffic) configured as a loopback port. The port is used internally by the BFD hardware to send control packets.
- IPforwarding is enabled on the BFD interfaces.
- Nexthop MAC address of neighbor should be known for the session creation. BFD process triggers ARP to resolve the next hop MAC address, if not configured statically.
Supported Platforms
- Summit X460-G2 series switches, standalone only
New CLI Commands
configure bfd hardware-assist [primary | secondary] loopback-port [ port | none]
Changed CLI Commands
The following show commands are changed to show the hardware assist information (shown in bold):
#show bfd Number of sessions : 0 Sessions in Init State : 0 Sessions in Down State : 0 Sessions in Admin Down State : 0 Sessions in Up State : 0 SNMP Traps for session-down : Disabled SNMP Traps for session-up : Disabled SNMP Traps for Batch Delay : 1000 ms Hardware Assist Operational State : Disabled(Loopback port not configured) Hardware Assist Primary Loopback Port : 1 Hardware Assist Secondary Loopback Port : None Maximum # of Hardware Assist Sessions : 900
# show bfd session detail vr all
Neighbour : 10.10.10.1 Local : 10.10.10.2
Vr-Name : bfd_vr10 Interface : bfd_vlan10
Session Type : Single Hop State : Up
?
Up Count : 1
Last Valid Packet Rx : 00:51:49.300000
Last Packet Tx : 00:51:48.8200000
Hardware Assist : Yes
Neighbour : 10.10.11.1 Local : 10.10.11.2
Vr-Name : bfd_vr10 Interface : bfd_vlan11
Session Type : Single Hop State : Up
?
Up Count : 1
Last Valid Packet Rx : 00:51:49.300000
Last Packet Tx : 00:51:48.8200000
Hardware Assist : Yes