This value identifies, by ifIndex, the local interface through which the next hop of a static route should actually be reached, equivalent to ipCidrRouteIfIndex. Admins rely on this to bind a route to a specific physical or logical interface rather than letting the routing table pick one automatically, which matters on multi-homed routers. For example, setting drStaticCidrIfIndex to the ifIndex of a WAN interface ensures that route's traffic always egresses through that specific link rather than a LAN port.