BFD Peers¶
A BFD Peer entry defines a relationship between this router and a peer so they can exchange BFD information and detect link faults.
Tip
For configurations with multiple peers which have similar settings, create a BFD profile with the common settings before creating peer entries.
BFD Peers are managed at Services > FRR BFD on the Peers tab.
The Peers tab contains a list of current BFD peers, if any, and controls to
manage the entries (e.g. edit, delete). The 
Add button creates a
new peer.
The remaining sections on this page cover the various options available when creating or editing a peer entry.
Peer Configuration¶
- Peer Address
The remote BFD peer address. The local and remote peer IP addresses must use the same address family (either IPv4 or IPv6)
- Description
A text description of this BFD peer.
- Profile
A BFD Profile from which settings will be used, unless overridden on this entry.
Options¶
- Multihop
Expect packets with a TTL value less than
254indicating there is more than one hop between peer addresses. Also listens on the multihop port,4784.In most cases this option is not necessary, but certain configurations may require it, such as running BGP on loopback interfaces instead of an interface directly connected to a peer.
Warning
When using multi-hop mode echo-mode will not work, see RFC 5883 section 3.
- Shutdown
Enables or disables the peer administratively.
When the peer is disabled in this way an “administrative down” message is sent to the remote peer.
Source Address/Interface¶
- Interface
The interface on which to enable BFD.
- Local Source Address
The local address used as a source for BFD packets, if it differs from the primary IP address on Interface.
Advanced Options¶
- Detect Multiplier
A non-zero value that is, roughly speaking, due to jitter, the number of packets that have to be missed in a row to declare the session to be down. Must be between
2and255.The remote transmission interval will be multiplied by this value to determine the connection loss detection timer. The default value is
3.- Receive Interval
The minimum interval, in milliseconds, at which this router can receive control packets from a peer. The default value is
300.- Transmit Interval
The minimum transmission interval, in milliseconds, for the router to send BFD control packets to peers. The default value is
300.- Echo Interval
The minimum interval, in milliseconds, at which this router can receive echos from a peer. The default value is
50.- Echo Mode
Enables or disables echo transmission mode. By default, this mode is disabled.
Warning
Echo mode is not supported on multi-hop setups, see RFC 5883 section 3.
Tip
FRR documentation recommends that the transmission interval of control packets to be increased after enabling echo mode to reduce bandwidth usage.
For example, increase Transmit Interval from
300to2000.