RTR Next-Hop Verification Overview

Static routes on E Series routers can use RTR probes configured as echo (ping) types to verify the availability of the next hop and obtain the state of the IP service. For more information about using RTR, see Response Time Reporter.

If you specify the verify rtr keywords with an RTR operation number when you issue the ip route command to establish a static route, the router verifies the next-hop status and installs the static route in the routing table only if both of the following conditions are met:

• The next hop to the specified IP destination address is resolved.
• The specified RTR operation is currently reachable.

You can further control the installation of static routes by specifying the last-resort keyword, which is valid only when you use the verify rtr keywords in the ip route command. The last-resort keyword instructs the router to install the static route in the routing table even if the specified RTR operation is unreachable, provided that no other static route to the same network prefix is available.