The value of sapIpipeUseBroadcastMac specifies whether
to use a broadcast MAC address to forward traffic from
the Ethernet Ipipe SAP when sapIpipeArpedMacAddress is
not a valid MAC address (no ARPed MAC address).
If svcIpipeCeAddressDiscovery is set to 'disabled (2)',
this value cannot be changed from the default value.
For non-Ethernet SAPs this value cannot be changed
from the default value.