Service Manual
• 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-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
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 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).
324 Bidirectional Forwarding Detection (BFD)