Hello, I saw earlier message that this is a new feature to track the next hop reachability. I run into this exact scenario and would like to ask for help.
My case is that I have a hub site with a ISP connection, so a internal WAN router on the secure side of firewall, and a internet edge router on the ISP link on the external side on my firewall. Normally I will have a default route on my internal router with next hop on the firewall inside address. But if the ISP link fails, I will have the blackhole situation.
The thought is to add RIP v2 to the internet edge router and on my internal router so my internal router will learn the default route dynamically instead.
But seeing this next hop reachability new feature, looks like I may not need to run RIP v2. (BTW, the reason for RIP v2 instead of EIGRP or OSPF is that our firewall guys said the firewall does not do well to open the holes for multicast type protocol, so that's why RIP v2 is chosen. BGP can be another option but we have other reason for not running BGP on the internal router).
All I want is to be able to remove the default route from the routing table when the ISP link or internet edge router is down or firewall is down for that matter. I don't need any backup option as I have that resolved in other way. Reading the tech tip document in the website says we can create SAA probes and create the objects and have that send ping to determine reachability and to use the track feature together to accomplish that. My question is do I really need to create the probes object and those icmp configuration?
Can I just do this instead (without any probes created?)
ip route 0.0.0.0 0.0.0.0 x.x.x.x track 1
track 1 ip route x.x.x.x reachability.
where x.x.x.x is the IP address of my ISP serial interface address on the ISP router in the internet cloud (not my internet edge router).
What do you think? Will that work? I will assume if my firewall or my internet edge router or the internet local loop fails, I will not be able to reach that x.x.x.x address so the default route can disappear in my routing table on my internal router?
Thank you so much.
