Hi all,
Hope someone can assist some Cisco noobs,
We have a network with two ISP's each connected to a seperate ASA5510. We can't use BGP with either ISP, so in order to to determine the state of the ISP links we're using object tracking from the ASA's to ping a router in each ISP's network. If the tracked object is up the route is advertised into the routing table and can be distributed via OSPF to the internal network. That works fine as long as there's a default route on the ASA for test pings to reach the tracked object.
The problem now is that we'd like to use object tracking to check that the default route is up. However, if there is no default route to begin with (eg after reloading the ASA) the test pings can't reach the tracked object and so the router can't establish the default route. We can't simply create a static default route with a higher metric than our tracked route because it would be advertised to the rest of the network whether the ISP link was up or not. It's a chicken-and-eg scenario where the test pings don't know the route to the tracked object (the ISP's router) until the tracked object is up and creates a default route.
So the question is how can we ensure the ASA's object tracking pings to our test object (the ISP's router) always exit via the ASA's external interface rather than via another route the ASA may pick up from OSPF?
Any help or tips are appreciated,
