Routing preferences between static and dynamic routing

[tj6512]

If I have 2 routes pointing to the same subnet destination, one static & one dynamic, then the static (lower AD value) route will be the one that gets installed in the routing table, right ? But, if say that the the next-hop interface to which the static route pointing to is down, will the dynamic route gets installed in the routing table ?

[a.manosca]

The route learned dynamically should be installed in the routing table.

Here's a link that provides additional info:

http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a0080094823.shtml

Goodluck!

[tj6512]

Thank you very much for your prompt response. However, since the primary route is a static route and the secondary route is a dynamically learned route, and the primary will always remain in the routing table (as I think that it cannot detect the next-hop-ip interface is down), in this case, the secondary dynamically learned route will never be used by the routing table.

I will agree with you, unless the static route is able to detect that its "peer" is down. But, I don't think static route can do that.

Under other circumstances, if both primary and secondary route are dynamically learned routes, that what you said before will work.

Please feedback...

[wolfrikk]

you can create a static route and point it to the outgoing interface, not the next hop address. That way the it will know if that interface goes down.

ip route 0.0.0.0 0.0.0.0 serial 0

This will set up the default route to use serial 0, not a next hop address.