Dell Command Line Reference Guide for the S4048–ON System 9.14.2.8

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bfd all-neighbors

Enable BFD sessions with all neighbors discovered by Layer 3 protocols virtual router redundancy protocol (VRRP), intermediate system to intermediate system (IS-IS), open shortest path first (OSPF), OSPFv3, or border gateway protocol (BGP) on router interfaces, and (optionally) reconfigure the default timer values.

Syntax
bfd all-neighbors [interval interval min_rx min_rx multiplier value role {active | passive}]
Parameters
interval milliseconds
(OPTIONAL) Enter the keyword interval to specify non-default BFD session parameters beginning with the transmission interval. The range is from 50 to 1000. The default is 200. Dell EMC recommends using more than 100 milliseconds.
min_rx milliseconds
Enter the keyword min_rx to specify the minimum rate at which the local system would like to receive control packets from the remote system. The range is from 50 to 1000. The default is 200. Dell EMC recommends using more than 100 milliseconds.
multiplier value
Enter the keyword multiplier to specify the number of packets that must be missed in order to declare a session down. The range is from 3 to 50. The default is 3.
role [active | passive]
Enter the role that the local system assumes:
  • Active — The active system initiates the BFD session. Both systems can be active for the same session.
  • Passive — The passive system does not initiate a session. It only responds to a request for session initialization from the active system.

The default is active.

Defaults
See Parameters.
Command Modes

ROUTER OSPF

ROUTER OSPFv3

ROUTER BGP

ROUTER ISIS

Command History

This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide.

Version
Description
9.13(0.0)
Introduced support for enabling BFD on non-default VRFs for IPv4 BGP, default, and non-default VRFs for IPv6 BGP on the S3100 series, S3048–ON, S4048–ON, S4048T-ON, S5000, S6000, S6000–ON, S6010–ON, S6100–ON, C9010, Z9500, and Z9100–ON.
9.11(2.1P1)

Introduced support for enabling BFD on non-default VRFs for OSPFv2 on all the remaining Dell EMC Networking OS platforms.

Introduced support for enabling BFD on non-default VRFs for OSPFv3 on all the Dell EMC Networking OS platforms.

9.10(0.2)
Introduced support for enabling BFD on non-default VRFs for OSPFv2 on the S3048–ON, S4048–ON, S4048T-ON, S6010–ON, Z9100–ON, and S6100–ON.
9.10(0.1)
Introduced on the S6010-ON and S4048T-ON.
9.10(0.0)
Introduced on the S3148.
9.10(0.0)
Introduced on the S6100-ON.
9.8(2.0)
Introduced on the S3100 series.
9.8(1.0)
Introduced on the Z9100–ON.
9.8(0.0P5)
Introduced on the S4048-ON.
9.8(0.0P2)
Introduced on the S3048-ON.
9.7(0.0)
Introduced on the S6000–ON.
9.0.2.0
Introduced on the S6000.
9.2(1.0)
Introduced on the Z9500.
9.2.(0.0)
Introduced BFD for VRRP and OSPFv3 on Z9000, S4810, and S4820T.
9.0.0.0
Introduced BFD for BGP on the Z9000.
8.3.19.0
Introduced on the S4820T.
8.3.8.0
Introduced BFD for BGP on the S4810.
8.4.1.3
Introduced BFD for BGP on the E-Series.
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 configured with the bfd neighbor command except in the following cases:
  • Timer values configured with the isis bfd all-neighbors or ip ospf bfd all-neighbors commands in INTERFACE mode override timer values configured 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 configured with the bfd neighbor command or configured for the peer group to which a neighbor belongs. The neighbors inherit only the global timer values (configured 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.

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