Configuring BFD Configuring BFD
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 20-13
-> ip bfd receive 500
The above command configures the global receive time interval of 500 msecs.
To change the receive time interval for BFD control packets, use the ip bfd interface receive command.
For example:
-> ip bfd interface bfd-vlan-101 receive 500
The above command changes the receive time interval value to 500 msecs on bfd-vlan-101.
The global receive time interval serves as the default interval value for receiving BFD control packets.
The default interval value is overridden when a specific receive value is configured.
Configuring the BFD Echo interval
The time interval between received BFD echo packets is configurable and applies when the echo function
is enabled. When this function is active, a stream of Echo packets is sent to a peer, which then loops these
back to the sender without processing them through its forwarding path. If the sender does not receive
several continuous echo packets from its peer, the BFD session is declared down.
To change the default value of the global BFD echo packet time interval, use the ip bfd echo-interval
command. For example:
-> ip bfd echo-interval 500
The above command sets the echo interval to 500 milliseconds globally on all BFD sessions.
To change the BFD echo time interval for a particular BFD session, use the ip bfd interface echo-inter-
val command. For example:
-> ip bfd interface bfd-vlan-101 echo-interval 500
The above command configures the echo time interval value to 500 milliseconds on bfd-vlan-101.
The global echo packet time interval serves as the default interval value. The default interval value is
overridden when a specific value is configured.
Configuring the BFD Multiplier
The BFD multiplier value is used to calculate the BFD detection time in asynchronous mode. The detec-
tion time between neighbors is calculated by multiplying the negotiated transmit time interval by the dead
interval multiplier. When an interface stops receiving packets from a neighbor, the interface uses the
detection time value to determine how long to wait before declaring that the BFD session is down.
The BFD multiplier parameter can be configured globally for all BFD configured interfaces as well as for
a specific interface.
To set or change the default global detection time multiplier value for all BFD sessions, use the ip bfd
multiplier command. For example:
-> ip bfd multiplier 5
The above command assigns a multiplier value of 5 to all BFD sessions.
To change the BFD multiplier for a specific session, use the ip bfd interface multiplier command. For
example:
-> ip bfd interface bfd-vlan-101 multiplier 5
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