Indicates the type of traffic the tunnel group can be used for
sending.
When the allowAllIp(0) bit is set, IP traffic destined for
all IPv4 routes will be allowed over any tunnel in the group
marked active.
When the allowAssignedIpOnly(1) bit is set, IP traffic
destined only for IPv4 static routes that have been explicitly
configured to use this tunnel group will be allowed.
When the allowAllLayer2Vpn(2) bit is set, layer 2 VPN traffic
for all layer 2 VPNs will be allowed over any tunnel in the
group marked active.
When the allowAssignedLayer2VpnOnly(3) bit is set, layer 2 VPN
traffic destined only for pseudo-wires that have been explicitly
configured to use this tunnel group will be allowed.