The value of vRtrIfIpv6uRPFCheckMode specifies the mode of unicast RPF
check.
By default the value of vRtrIfIpv6uRPFCheckMode is 'strict (0)',which means
that uRPF checks whether the incoming packet has a source address that
matches a prefix in the routing table, and whether the interface
expects to recieve a packet with this source address prefix.
When the value of vRtrIfIpv6uRPFCheckMode is 'loose (1)', the uRPF checks
whether the incoming packet has a source address with a corresponding
prefix in the routing table. It does not check whether the interface
expects to recieve a packet with a specific source address prefix.
This object is valid only when value of vRtrIfIpv6uRPFCheckState is set
to 'enabled'.