ROUTER BGPROUTER ISIS (Not available on the C-Series.)Command History Version 9.0.0.0 Introduced BFD for BGP on the Z9000.Version 8.3.8.0 Introduced BFD for BGP on the S4810.Version 8.4.1.3 Introduced BFD for BGP on the E-Series ExaScale.Version 8.2.1.0 Introduced BFD for OSPF and ISIS on the E-Series ExaScale.Version 7.6.1.0 Introduced BFD for OSPF on the C-Series.Version 7.5.1.0 Introduced BFD for ISIS on the E-Series.Version 7.4.1.0 Introduced BFD for OSPF on the E-Series.UsageInformationAll neighbors inherit the timer values configured with the bfd neighbor command exceptin the following cases:• Timer values configured with the isis bfd all-neighbors or ip ospf bfdall-neighbors commands in INTERFACE mode override timer values configuredwith the bfd neighbor command. Likewise, using the no bfd neighborcommand does not disable BFD on an interface if BFD is explicitly enabled using theisis bfd all-neighbors command.• Neighbors that have been explicitly enabled or disabled for a BFD session with thebfd neighbor or neighbor bfd disable commands in ROUTER BGP modedo not inherit the global BFD enable/disable values configured with the bfdneighbor command or configured for the peer group to which a neighbor belongs.The neighbors inherit only the global timer values (configured with the bfdneighbor command).RelatedCommandsshow bfd neighbors – displays BFD neighbor information on all interfaces or a specifiedinterface.bfd neighbor – explicitly enables a BFD session with a BGP neighbor or a BGP peer group.neighbor bfd disable – explicitly disables a BFD session with a BGP neighbor or a BGP peergroup.bfd disableDisable all virtual router redundancy protocol (VRRP) sessions in a VRRP group.C-Series, E-Series, Z-SeriesSyntax bfd disableRe-enable BFD using the no bfd disable command.Defaults BFD is disabled by default.Command Modes INTERFACE VRRP314
