Configuring BFD Configuring BFD
OmniSwitch AOS Release 6 Network Configuration Guide September 2009 page 30-15
-> ip bfd-std interface bfd-vlan-101 receive 500
The above command changes the receive time interval value to 500 msecs on the BFD interface named
bfd-vlan-101.
The global receive time interval serves as the default interval value for a BFD interface. The default inter-
val value is overridden when a specific value is configured for the interface.
Configuring the BFD Operating Mode
As previously mentioned, BFD operates in two modes: Echo and Asynchronous mode. The Echo function
can be used alone or simultaneously with the Asynchronous mode. By default, BFD is configured to oper-
ate in the Asynchronous mode with the Echo function enabled
To change the global operational mode and echo status of BFD, use the ip bfd-std mode command, as
shown below:
-> ip bfd-std mode asynchronous echo disable
The above command configures BFD to globally operate in the asynchronous mode with the echo func-
tion disabled.
The BFD operational mode and echo status is also configurable at the BFD interface level. To change the
operational mode of a specific BFD interface, use the ip bfd-std interface mode command along with the
interface name. For example:
-> ip bfd-std interface bfd-vlan-101 mode echo-only
The above command sets the operational mode of BFD interface named bfd-vlan-101 to echo only.
The global operating mode and Echo function status serves as the default mode for a BFD interface.The
global mode and status is overridden when a specific value is configured for the interface.
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 via its forwarding path. If the sender does not receive several
continuous echo packets from its peer, the BFD session is declared down.
By default, the Echo time interval is set to 100 milliseconds. To change the global BFD echo packet time
interval, use the ip bfd-std echo interval command. For example:
-> ip bfd-std echo interval 500
The above command sets the echo interval to 500 milliseconds globally on all BFD interfaces.
To change the BFD echo time interval for a particular BFD interface, use the ip bfd-std interface echo-
interval command. For example:
-> ip bfd-std interface bfd-vlan-101 echo-interval 500
The above command configures the echo time interval value to 500 milliseconds on BFD interface named
bfd-vlan-101.
The global echo packet time interval serves as the default interval value for a BFD interface. The default
interval value is overridden when a specific value is configured for the interface.
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