David/Roopa - Olivier asked me about these two issues yesterday in the FRR Technical Meeting. I just wanted to make sure I didn't loose track of these questions that he had: 1) More than 2 labels in the kernel at a time, when will this be allowed in the kernel? -> David is currently working on this issue. When he is done it will be upstreamed. So soonish(tm). 2) PenUltimate Hop Popping: I know this issue is not trivial to solve. In fact, once the POP instruction perform, the packet must re-enter in the IP packet processing to determine what action must apply. A possible solution would be to process this packet as a new incoming IP packet when output interface is the loopback disregarding the IP address value. But, this issue is less urgent than the first one. Our OSPF Segment Routing implementation could announce if the router works in PenUltimate Hop Poping mode or not. So, for the moment, the option is force to yes. thanks! donald