The value of vRtrMvpnVrfTargetUnicast specifies whether unicast
vrf-target extended community is used for the Multicast VPN (MVPN)
as well.
If the value is 'true', vRtrVrfTarget extended community is used for
MVPN.
If the value is 'false', vRtrMvpnVrfTarget extended community is used
for MVPN.