This bitmask object declares which GMPLS signaling protocols, RSVP-TE for GMPLS, CR-LDP for GMPLS, or some other protocol, are enabled on this interface, and multiple bits may be set simultaneously since an interface can support more than one. An administrator configures this to control which label-switched-path signaling mechanisms this particular interface is allowed to use; leaving no bits set means the interface cannot participate in dynamic GMPLS signaling and any LSPs through it must be manually provisioned. Setting just the rsvp-gmpls bit would allow that interface to establish GMPLS LSPs using RSVP-TE signaling exclusively.