The BGP graceful restart mechanism has a limitation that the graceful restart time cannot exceed 4095 seconds as per

This feature implements RFC 3478. It allows devices to preserve the MPLS LDP LFIB entries in the forwarding plane if

LDP Graceful Restart 4.24.1 GR

IS-IS SR Stateful Switchover (SSO) support allows for a switchover from an active supervisor to a standby supervisor where MPLS traffic remains undisrupted during switchover. This involves reconciliation of all Segment Routing related information in the network using IS-IS Graceful Restart procedures. And also installing the same in forwarding hardware in a manner that does not disrupt the ongoing traffic.

TOI SSO IS-IS Graceful Restart EOS 4.32.2F