Authors and OPS-DIR, I have reviewed the LC version of the draft above, describing the BIER encapsulation of MPLS and non-MPLS packets, within the limits of BIER domains and sub-domains. I noted that BIER routers are expected to decrement TTL, but if the TTL=1, the packet MUST not be forwarded. But then, there is no requirement for further action or notification. A requirement to pass the expired packet elsewhere seems to be necessary to generate a notification of TTL expiry, but any action beyond discard is worded as optional (MAY be passed to other layers for processing). To me, this seems incomplete from a network operation perspective. If this topic has been discussed at some length, please let us know how this concern about operations was addressed, or suggest edits/clarifications to the current text. thanks and regards, Al