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:lastproofread: 2023-01-27
.. include:: /_include/need_improvement.txt
.. _routing-bfd:
###
BFD
###
:abbr:`BFD (Bidirectional Forwarding Detection)` is described and extended by
the following RFCs: :rfc:`5880`, :rfc:`5881` and :rfc:`5883`.
In the age of very fast networks, a second of unreachability may equal millions of lost packets.
The idea behind BFD is to detect very quickly when a peer is down and take action extremely fast.
BFD sends lots of small UDP packets very quickly to ensures that the peer is still alive.
This allows avoiding the timers defined in BGP and OSPF protocol to expires.
Configure BFD
=============
.. cfgcmd:: set protocols bfd peer <address>
Set BFD peer IPv4 address or IPv6 address
.. cfgcmd:: set protocols bfd peer <address> echo-mode
Enables the echo transmission mode
.. cfgcmd:: set protocols bfd peer <address> multihop
Allow this BFD peer to not be directly connected
.. cfgcmd:: set protocols bfd peer <address> source
[address <address> | interface <interface>]
Bind listener to specific interface/address, mandatory for IPv6
.. cfgcmd:: set protocols bfd peer <address> interval echo-interval <10-60000>
The minimal echo receive transmission interval that this system is
capable of handling
.. cfgcmd:: set protocols bfd peer <address> interval multiplier <2-255>
Remote transmission interval will be multiplied by this value
.. cfgcmd:: set protocols bfd peer <address> interval
[receive | transmit] <10-60000>
Interval in milliseconds
.. cfgcmd:: set protocols bfd peer <address> shutdown
Disable a BFD peer
Enable BFD in BGP
-----------------
.. cfgcmd:: set protocols bgp neighbor <neighbor> bfd
Enable BFD on a single BGP neighbor
.. cfgcmd:: set protocols bgp peer-group <neighbor> bfd
Enable BFD on a BGP peer group
Enable BFD in OSPF
------------------
.. cfgcmd:: set protocols ospf interface <interface> bfd
Enable BFD for OSPF on an interface
.. cfgcmd:: set protocols ospfv3 interface <interface> bfd
Enable BFD for OSPFv3 on an interface
Enable BFD in ISIS
------------------
.. cfgcmd:: set protocols isis <name> interface <interface> bfd
Enable BFD for ISIS on an interface
Operational Commands
====================
.. opcmd:: show bfd peers
Show all BFD peers
.. code-block:: none
BFD Peers:
peer 198.51.100.33 vrf default interface eth4.100
ID: 4182341893
Remote ID: 12678929647
Status: up
Uptime: 1 month(s), 16 hour(s), 29 minute(s), 38 second(s)
Diagnostics: ok
Remote diagnostics: ok
Local timers:
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 50ms
Remote timers:
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 0ms
peer 198.51.100.55 vrf default interface eth4.101
ID: 4618932327
Remote ID: 3312345688
Status: up
Uptime: 20 hour(s), 16 minute(s), 19 second(s)
Diagnostics: ok
Remote diagnostics: ok
Local timers:
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 50ms
Remote timers:
Receive interval: 300ms
Transmission interval: 300ms
Echo transmission interval: 0ms
BFD Static Route Monitoring
===========================
A monitored static route conditions the installation to the RIB on the BFD
session running state: when BFD session is up the route is installed to RIB,
but when the BFD session is down it is removed from the RIB.
Configuration
-------------
.. cfgcmd:: set protocols static route <subnet> next-hop <address>
bfd profile <profile>
Configure a static route for <subnet> using gateway <address>
and use the gateway address as BFD peer destination address.
.. cfgcmd:: set protocols static route <subnet> next-hop <address>
bfd multi-hop source <address> profile <profile>
Configure a static route for <subnet> using gateway <address>
, use source address to indentify the peer when is multi-hop session
and the gateway address as BFD peer destination address.
.. cfgcmd:: set protocols static route6 <subnet> next-hop <address>
bfd profile <profile>
Configure a static route for <subnet> using gateway <address>
and use the gateway address as BFD peer destination address.
.. cfgcmd:: set protocols static route6 <subnet> next-hop <address>
bfd multi-hop source <address> profile <profile>
Configure a static route for <subnet> using gateway <address>
, use source address to indentify the peer when is multi-hop session
and the gateway address as BFD peer destination address.
Operational Commands
====================
.. opcmd:: show bfd static routes
Showing BFD monitored static routes
.. code-block:: none
Showing BFD monitored static routes:
Next hops:
VRF default IPv4 Unicast:
10.10.13.3/32 peer 192.168.2.3 (status: installed)
172.16.10.3/32 peer 192.168.10.1 (status: uninstalled)
VRF default IPv4 Multicast:
VRF default IPv6 Unicast:
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