The value of vRtrMvpnIpmsiBfdRtTraInt specifies the BFD transmit
interval over this interface. The minimum accepted value depends
on the value of 'vRtrIfBfdExtType', as follows:
'cpmNp(1)' : 10 milliseconds
'auto(2)' : 100 milliseconds.
The value of this object is only applicable when vRtrMvpnIpmsiType is
set to 'rsvp'.
An 'inconsistentValue' error is returned if an attempt is made to modify
the value of this object when vRtrMvpnIpmsiEnableBfdRoot is set to false.