[mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-rfc6374-udp-return-path-04: (with COMMENT)

["Spencer Dawkins" <[e-mail]>]

Spencer Dawkins has entered the following ballot position for
draft-ietf-mpls-rfc6374-udp-return-path-04: No Objection

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COMMENT:
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I would be fine keeping the to-be-deleted text explaining alternatives
that were not selected, especially if it was moved to an appendix. If
anyone ever wonders about the alternatives, that would mean they didn't
have to dig through e-mail archives to see what was considered and why
the alternatives were rejected.

I'm not understanding why 

   When the MPLS-PLDM Response is requested out-of-band by setting the
   Control Code of the MPLS-PLDM query to "Out-of-band Response
   Requested", and the URO is present, the responder SHOULD send the
   response back to querier on the specified destination UDP port at the
   specified destination IP address contained in the URO.
   
is a SHOULD. Could you help me with that?