*> A crankback TLV is suggested in Section 4.3. While crankback is a *> desirable extension to both CR-LDP and RSVP-TE (and required by *> ASON), the proposal ignores the prior work done in *> http://www.ietf.org/internet-drafts/draft-iwata-mpls-crankback-04.txt. *> The advantages of the proposed method should be identified and *> justified. Maybe it's time for someone to write an I-D entitled "Crankback Considered Harmful" ? Bob Braden