LDP DoD Graceful Restart
LDP graceful restart is a mechanism that helps reduce the negative effects on MPLS traffic caused by the restart of a Label Switching Router's (LSR's) control plane, specifically by the restart of its Label Distribution Protocol (LDP) component [RFC3036], on LSRs that are capable of preserving MPLS forwarding state across the restart. [RFC3478] defines procedures for LDP graceful restart for downstream unsolicited label distribution but leaves procedures for downstream on demand label distribution a subject for future study. This document defines graceful restart procedures for downstream on demand label distribution.