This is the RSVP-TE R value, the average interval in milliseconds at which the device sends refresh Path and RESV messages to keep existing reservation state alive. This value directly trades signaling overhead against failure-detection speed for every RSVP-TE session on the device: too short an interval generates a proportionally heavier stream of refresh messages across potentially hundreds of LSPs, while too long an interval, combined with the refresh multiple, slows down how quickly a stale or dead session is detected and cleaned up. For example, at a refresh interval of 30000 ms (30 seconds) and a refresh multiple of 3, an RSVP-TE session would need roughly 90 seconds without any refresh before being declared timed out.