Because replaceable static routes are intended to be last-resort routes, TCP/IP attempts to use them only if no dynamic routes to a destination are available. If a non-replaceable static route fails validation, even if the reason for the failure is transient (for example, gateway unreachable), the definition for the non-replaceable static route is discarded. However, if a replaceable static route fails validation for a transient reason, the definition of the route is retained. When there are no dynamic routes to the destination, TCP/IP periodically tries to add the replaceable static route to the routing table. Because of these periodic attempts, multiple EZZ4348I messages might be seen. Attempts occur every 30 seconds at the most, if there are no active routes to the destination in the routing table and at least one new route was added to the routing table since the last attempt. Attempts end when a valid route to the destination is installed into the routing table, whether it is a dynamic, static, or replaceable static route.
For a discussion of things to consider when using IPv6 static routing and IPv6 router advertisements together on the same TCP/IP stack, see Use of IPv6 static routing with router advertisements. For a discussion of things to consider when using IPv6 static routing and OMPROUTE together on the same TCP/IP stack, see Use of static routing with OMPROUTE.