This read-create object holds the source IP address of this LSP, identifying the ingress router where the traffic-engineered tunnel originates. It lets an administrator confirm exactly which router is the head-end for a given tunnel when reviewing MPLS-TE topology. For example, an operator auditing all tunnels destined for a particular data center would filter by csMplsLspTo while cross-referencing csMplsLspFrom to see which edge routers originate traffic toward that destination.