Configuring BFD Configuring BFD
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 20-16
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|ipv6 bfd interface echo-
interval command. For example:
-> ip bfd interface bfd-vlan-101 echo-interval 500
-> ipv6 bfd interface bfd-vlan-201 echo-interval 500
The above command configures the echo time interval value to 500 milliseconds on “bfd-vlan-101” and
“bfd-vlan-201”.
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
detection 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|ipv6 bfd interface multiplier command.
For example:
-> ip bfd interface bfd-vlan-101 multiplier 5
-> ipv6 bfd interface bfd-vlan-201 multiplier 5
The above command assigns a multiplier value of 5 to “bfd-vlan-101” and “bfd-vlan-201”.
Enabling or Disabling BFD Status
As BFD is globally disabled for the routing instance, to enable the global BFD status, use the ip bfd
admin-state command. For example:
-> ip bfd admin-state enable
To disable the global BFD status for the routing instance, use the ip bfd admin-state command with the
disable keyword. For example:
-> ip bfd admin-state disable
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