the pictures in the following pages are more clear to me:
with FRF.16 (that actually is the one I know more) the service is provided by the service provider that is aware of the bundle so you have a UNI (DTE) to NNI (DCE) communication for setting up the bundle.
The advantage is that on other nodes the PVCs can be carried over whatover type of FR (or ATM) link.
FRF.15 is instead a sort of private bundle performed end-to-end between the routers.
In this case the service provider just provides some E1 links (circuit switching) and it is not aware of the bundle.
On the other hand all links have to be E1.
In some way FRF.15 is more similar to what happen with PPP multilink where you can bundle two E1 and the configuration is end-to-end (WAN switches in the middle just cross connect the E1 links).
For example we have a PPP bundle of two E1 and each E1 is provided by a different provider,
Introduction: The "external-out enable" command is available for
configuration under the "router ospf process" in case of the IOS-XR
operating system. This command basically enables advertisement of
intra-area routes on the device as external routes in th...
Introduction Basic configuration for netflow Scale parameters for
netflow Netflow support Architecture Packet flow for netflow Inside the
LC CPU Netflow Cache size, maintenance and memory Sample usage Cache
Size Aging Permanent cache Characteristics Which...