You can add a static route and give it a higher value than your EIGRP routes. This will cause all default traffic to go out A, though.
However, when doing routing, the router looks at the best match for a destination. So for example, if your address pool at site 'A' is 172.16.0.0/12, then when 'B' or 'C' send traffic to 172.30.0.254, it'll go to router A, not to the default route (0.0.0.0/0) because 172.30.0.254 more closely matches 172.16.0.0/12 than 0.0.0.0/0.
If you do a "sh ip route eigrp", do sites 'B' and 'C' have the proper routes to 'A'?
The document explains which protocol is added to the routing table. I'm trying to find a document that states something to the effect that a default route is chosen last over administrative distance.
If I go off just administrative distance then my scenario won't work as site B has site C network through EIGRP with an administrative distance of 90 but the default route is static which has an administrative distance of 1. With that being said it would choose the default route over the EIGRP.
"Remember, a specific route will be preferred over the administrative distance." Can you point me to where this is described?
Logically speaking you wouldn't want this to happen. I would think the default route would be last resort if not found in routing table.
I guess what I am looking for is a logic diagram as this document
"Which of these routes will be installed in the routing table? Since EIGRP internal routes have the best administrative distance, it's tempting to assume the first one will be installed. However, since each of these routes has a different prefix length (subnet mask), they're considered different destinations, and they will all be installed in the routing table"
ie. it is clearly stating that all routes in the example will be installed and then it goes on to explain how the forwarding decision is made and the forwarding decision is always based on the most specific match (unless of course you are using PBR).
The default-route is the least specific route so it will be used when there is no more specific route in the routing table. Doesn't matter about the AD of the route.
Where the AD does matter is if you have 2 routes that are exactly the same prefix/subnet mask, then the router will choose the one with the lower AD.
So in your scenario as long as the EIGRP learned routes are more specific than the default route, and they should be, then the router will use the EIGRP routes if it finds a match.
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