The value of vRtrIfBfdTransmitInterval specifies the BFD transmit
interval over this interface. The minimum accepted value depends
on the value of vRtrIfBfdType, as follows:
'cpmNp(1)' : 10 milliseconds
'auto(2)' : 100 milliseconds.
The vRtrIfBfdTransmitInterval object is obsoleted and replaced with
vRtrIfBfdExtTransmitInterval object in 9.0 Release.