BFD features

BGP, OSPFv2, OSPFv3, PIMv4 and PIMv6, static routes, and VRRP are clients of BFD.

Supported:

  • BFD v1

  • Asynchronous mode + echo

  • IPv6 (8400, 6400 and 6300 switches only)

  • Asynchronous mode on IPv6 tunnel interfaces (8400 switches only)

  • Asynchronous mode for VxLAN tunnels (8325 switches only)

  • Single hop

  • IPv4

  • RoP, SVI, and LAG interfaces

  • VSX synchronization. For more information, see the Virtual Switching Extension (VSX) Guide for your switch and software version.

  • Loopbacks are supported for VxLAN sessions (8325 switches only), and static routes (8400, 6400 and 6300 switches only). Same IP version restrictions apply.

Not supported:

  • MIB support

  • IPv6 (832x switches only)

  • Demand mode

  • Micro-BFD

  • Authentication

  • Echo function on tunnel interfaces

  • Echo function for IPv6

  • Asynchronous mode on tunnel interfaces (832x switches only)

  • Multi-hop configurations. BFD works only for directly connected neighbors. BFD neighbors must be no more than one IP hop away.

  • Passive and virtual link interfaces. Loopbacks are not supported on the 8320 and 8325 switches with the exception of VXLAN sessions on 8325 switches.

  • Exceeding a maximum of 20 BFD sessions with interval values of 300ms. Spurious sessions flaps will occur when the limit of sessions is exceeded.

  • Minimum intervals of 300ms are only compatible with the async_vxlan mode (BFD sessions across VxLAN) and is not user configurable.

  • Setting minimum transmit time interval between 500 ms and 1000 ms, and bfd detect-multiplier less than 3 might result in spurious flaps.