Static route dissapears when interface down

[ccotech00]

Can anyone please help me out on this :

I have static route on a router to a remote network ,interface to remote network was in a down,down state ,and static entry dissapeared from routing table ,i could see the entry for the static route in the config though ,is this possible ? It is a cisco 3745 router with a 128K Diginet link to remote network.

[Harold Ritter]

this is normal if your static route is tied to the physical interface as follow:

ip route 192.168.1.0 255.255.255.0 ethernet0/0

or

ip route 192.168.1.0 255.255.255.0 ethernet0/0 192.168.2.1

Why is it a problem if the interface is down anyway?

Hope this helps,

[ccotech00]

Static route is not bound to physical interface but to IP of next hop router serial interface ,this is not a problem ,but the router forwarded the packets destined for the remote network ,to it`s default route ,which in this case is a firewall ,so there was some strange entries showing up in the firewall logs. Was just curious cause i wasn`t aware that a static route could be purged from the routing table.Might just be my inexperience though.Thanks for the feedback

[m.lammerse · Accepted solution]

This is perfectly normaly behavior. If the static route would stay in the routing table, the router would be forwarding traffic to an interface that is not functioning properly.

One exception is a dialer interface, which establishes an on-demand connection. The router needs to be capable of forwarding traffic across a dialer, even when there is no active call. In that case, the router will 'spoof' the connection as being up. You can see that with 'show interface dialer .. '

HTH