Users Guide
Version Description
8.2.1.0 Introduced BFD for OSPF and ISIS on the E-Series.
7.6.1.0 Introduced BFD for OSPF on the C-Series.
7.5.1.0 Introduced BFD for ISIS on the E-Series.
7.4.1.0 Introduced BFD for OSPF on the E-Series.
Usage Information
All neighbors inherit the timer values congured with the bfd neighbor command except in the following cases:
• Timer values congured with the isis bfd all-neighbors or ip ospf bfd all-neighbors
commands in INTERFACE mode override timer values congured with the bfd neighbor command.
Likewise, using the no bfd neighbor command does not disable BFD on an interface if you explicitly enable
BFD using the isis bfd all-neighbors command.
•
Neighbors that have been explicitly enabled or disabled for a BFD session with the bfd neighbor or
neighbor bfd disable commands in ROUTER BGP mode do not inherit the global BFD enable/disable
values congured with the bfd neighbor command or congured for the peer group to which a neighbor
belongs. The neighbors inherit only the global timer values (congured with the bfd neighbor command).
You can only enable BFD for VRRP in INTERFACE command mode (vrrp bfd all-neighbors).
You can enable BFD on both default and nondefault VRFs for OSPF and BGP protocols for both IPv4 and IPv6
neighbors.
NOTE: The bfd all-neighbors command is applicable for both IPv4 and IPv6 BGP sessions.
bfd enable (Conguration)
Enable BFD on all interfaces.
Syntax
bfd enable
Disable BFD using the no bfd enable command.
Defaults BFD is disabled by default.
Command Modes CONFIGURATION
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell EMC
Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.8(2.0) Introduced on the S3100 series.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.2(1.0) Introduced on the Z9500.
9.0.0.0 Introduced on the Z9000.
8.3.19.0 Introduced on the S4820T.
Bidirectional Forwarding Detection (BFD) 375