Refer to the exhibit.A network engineer must improve the current IS-IS environment. The Catalyst switch is equipped with dual supervisors. Each time a stateful ...

Refer to the exhibit.A network engineer must improve the current IS-IS environment. The Catalyst switch is equipped with dual supervisors. Each time a stateful switchover occurs, the network experiences unnecessary route recomputation. Which solution addresses this issue if the upstream router does not understand graceful restart messaging?

A. Enable IS-IS remote LFA FRR on both devices. B. Enable NSR on the switch. C. Enable NSF on the switch. D. Configure ISIS aggressive timers on both devices.