This counter tracks sequence-number reset events on this VPDN session — payload packets that have the R-bit set, which signals the tunnel protocol has restarted its sequencing. Because a reset normally happens only when a session's window has been reinitialized, an admin watching this counter increase repeatedly would suspect an unstable or flapping tunnel rather than a healthy long-lived one. For example, a session whose R-bit count climbs every few minutes while call duration keeps resetting suggests the PPP session behind it is repeatedly renegotiating.