The value of vRtrPimNgAFGenMvpnAD specifies the auto-discovery
mechanism to be used for discovering peers using BGP.
When the value of vRtrPimNgAFGenMvpnAD is set to 'none(0)',
auto-discovery via BGP is disabled. When the value is set to
'default(1)', auto-discovery via BGP is enabled using default IPMSI AD
format. When the value is set to 'mdtSafi(2)', auto-discovery via BGP
is enabled using MDT-SAFI format.
A MDT-SAFI address is a 16-byte value consisting of 12-byte route
distinguisher(RD) followed by a 4-byte group address.
An 'inconsistentValue' error is returned if this object is set to
non-default value, when the value of TIMETRA-VRTR-MIB::vRtrInterASMvpn
is 'true'.