Indicates the Synchronization status of the tunnel upon RSVP-TE Graceful Restart. This object is applicable only for RSVP-TE signalled tunnels. Following values are possible. 0. Not synchronized. 1. Downstream Synchronized. 2. Upstream Synchronized. 3. Fully Synchronized. Fully Synchronized refers that the tunnel is fully recovered its state. Both upstream and downstream nodes has helped the restarting node to recover its state. Downstream Synchronized refers that only downstream node has helped the restarting node by sending RecoveryPath message. In this case, node saves the RecoveryPath message and starts the recovery process after getting help from upstream node also. Upstream Synchronized refers that only uptream node has helped the restarting node by sending Path message with recovery label object. In this case, node saves the Path message and starts the recovery process after getting help from downstream node also. Not Synchronized state refers that both upstream node and downstream node has not helped in recovering this tunnel.