Bidirectional Forwarding Detection (BFD) Configuration Module

This configuration module configures the basic BFD (RFC5880) parameters. To configure fast failover with BFD, use the routing protocol configuration modules. At the moment, you can use BFD with IS-IS and OSPF.

BFD is supported on these platforms:

Operating system	Configurable timers	OSPF	IS-IS
Arista EOS	✅	✅	✅
Aruba AOS-CX	✅	✅	❌
Cisco IOS	✅	✅	✅
Cisco IOS XE[1]	✅	✅	✅
Cisco Nexus OS	✅	✅	✅
Cumulus Linux	✅❗	✅	❌
FRR	✅❗	✅	❌
Dell OS10	❌	✅	❌
Junos[2]	✅❗	✅	✅
Mikrotik RouterOS 6	❌	✅	✅
Mikrotik RouterOS 7	❌	❌	❌
Nokia SR Linux	✅	✅	✅
Nokia SR OS	✅	✅	✅
VyOS	✅❗	✅	✅

Parameters

The following parameters can be set globally or per node/link:

min_tx: The desired minimal interval for sending BFD packets, in msec.
min_rx: The required minimal interval for receiving BFD packets, in msec
min_echo_rx: Echo function timer, in msec
multiplier: Number of missed packets before the session is considered down

Global defaults are set pretty high to accommodate a wide range of virtual network devices with varying quality of BFD implementation:

min_tx: 1 second (1000 msec)
min_rx: 1 second (1000 msec)
min_echo_rx: disabled (set to zero)
multiplier: 3

Valid intervals and ranges are platform-dependent. Some platforms have lower default values:

platform	min-tx	min-rx
nxos	1000 msec	500 msec
srlinux	100 msec	100 msec
sros	100 msec	100 msec

Example

To enable BFD using default values on all IS-IS interfaces:

module: [ isis, bfd ]

isis:
 bfd:
  ipv4: True
  ipv6: True