Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 952)

922 Multi-Service IronWare Switching Configuration Guide
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Configuring BFD for the specified protocol
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If the bfd holdover-interval is set to 20 seconds, when a notification is received from BFD that the
BFD session has moved to DOWN state, the system waits for 20 seconds before sending the BFD
session down notification to OSPFv2 state machine. If the BFD session returns to UP state before
the 20 seconds expires, the OSPFv2 state machine is not notified that the BFD session flapped.
Otherwise, after 20 seconds the BFD session down notification is passed to the OSPFv2 state
machine. If BFD for OSPFv2 is disabled, the request to not use BFD for OSPFv2 is passed to BFD by
OSPFv2, BFD acknowledges this request, and the BFD session is removed. If BFD is disabled,
OSPFv2 is notified and asks BFD to remove the single hop BFD session on the interface.
NOTE
The benefit of this feature is that OSPF adjacency will not go down if a BFD session is reestablished
within the holdover interval preventing disruption to the OSPF routing table.
To configure the BFD down notification delay, enter a command such as the following.
Brocade(config-ospf-router)# bfd holdover-interval 10
Syntax: [no] bfd holdover-interval time-seconds
The time-seconds variable is a number between 0 and 20 seconds. The default is 0 seconds.
The no option removes the BFD holdover interval from the configuration.
Configuring BFD for OSPFv3
You can configure your device for BFD on the OSPFv3 protocol for all OSPFv3 enabled interfaces or
for specific interfaces as shown in the following sections.
Enabling BFD for OSPFv3 for all interfaces
You can configure BFD for OSPFv3 on all OSPFv3 enabled interfaces using the command shown in
the following.
Brocade(config)# ipv6 router ospf
Brocade(config-ospf6-router)# bfd all-interfaces
Syntax: [no] bfd all-interfaces
Although this command configures BFD for OSPFv3 on all of the OSPFv3 enabled interfaces on a
device, it is not required if you use the ipv6 ospf bfd command to configure specific interfaces. It
can be used independently or together with the ipv6 ospf bfd command.
Enabling or disabling BFD for OSPFv3 for a specific interface
You can selectively enable or disable BFD on any OSPFv3 interface as shown in the following.
Brocade(config-if-e1000-3/1)# ipv6 ospf bfd enable
Syntax: ipv6 ospf bfd [disable | enable]
The disable option disables BFD for OSPFv3 on the interface. The enable option enables BFD for
OSPFv2 on the interface.
Holdover interval
The BFD holdover interval is supported for single hop sessions. It sets the time by which the BFD
session DOWN notification to OSPFv3 is delayed. If within that holdover time, the BFD session is UP
then OSPFv3 is not notified of the BFD session flap.