Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 955)

Multi-Service IronWare Switching Configuration Guide 925
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Configuring BFD for the specified protocol
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Syntax: [no] bfd-enable
NOTE
If BFD for BGP4 is globally disabled and then enabled, the original BFD sessions for BGP4 may not
be available, depending on whether or not the maximum BFD sessions limit has been reached.
When a BFD session for BGP4 is disabled, the session will be removed but BGP4 peering will not go
down. The remote BFD peer will be informed that BFD use is disabled.
Setting the transmit, receive, and detection time multiplier at the global level
When using BFD for BGP4, you must configure BFD globally at the router BGP level. You can also
use this configuration to set new default values for the transmit interval, receive interval, and for
the detection time multiplier.
For a single hop EBGP session, the BFD parameters configured under interface will be used
because the BFD session for single hop is also shared with other applications. To create a BFD
session for a single hop BGP4 session, you must have BFD enabled and the timers configured for
the interface on which single hop BGP4 peering is established.
NOTE
For multihop BFD sessions, BFD does not have to be enabled for any of the interfaces, and the BFD
timers need not be configured, since the default values can be used.
The timers parameters min-tx, min-rx and multiplier can also be configured for each peer and peer
group and will override the global configuration.
To configure a multi hop EBGP or IBGP session, enter a command such as the following.
Brocade(config)# router bgp
Brocade(config-bgp)# bfd-enable
Brocade(config-bgp)# min-tx 500 min-rx 500 multiplier 5
Syntax: [no] min-tx transmit-time min-rx receive-time multiplier number
The transmit-time variable is the interval in milliseconds between which this device will send a BFD
message to its peer informing it that it is still operational. Acceptable values are: 50 - 30000.
Default value: 1000 (unless changed at the global level
The receive-time variable is the interval in milliseconds that this device waits to receive a BFD
message from its peer. The device will wait for this interval for the number of times specified in the
number variable before determining that the connection to its peer in not operational. Acceptable
values are 50 - 30000. The default value is 1000 (unless changed at the global level)
The multiplier option allows you to specify a value for the number of times in a single sequence that
this device will wait to receive a BFD message from its peer before determining that the connection
to that peer is not operational. This value is set at the number variable. Acceptable values are 3 -
50. The default value is 3.
The no option globally removes the BFD for BGP4 configuration from the device.
Holdover interval
The BFD holdover interval is supported for both single hop and multihop sessions. It sets the time
by which the BFD session DOWN notification to BGP4 is delayed. If within that holdover time, the
BFD session is UP then BGP4 is not notified of the BFD session flap.
The holdover interval can be configured globally, on each peer, or peer-group.