A service provider is inserting a new IS-IS router into a Level-2 backbone. During the boot process, BGP takes about 90 seconds to fully converge and install all VPNv4 routes. Operations reports that immediately after the router's IS-IS adjacencies come up, transit traffic is black-holed for over a minute because packets are forwarded through the new node before its BGP table is complete. Which IS-IS configuration should be applied to prevent the router from being used as a transit path until BGP has converged?