IOS: Static Route on Interface

IOS: Static Route on Interface
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Subject Author Date
IOS: Static Route on Interface linkwood 12-14-2004
Posted by linkwood on December 14, 2004, 9:00 pm
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I've got a C2600 where I add a static route on the eth interface.
Why does this static route stay active even when the interface is down?

eg.
interface ethernet 0/0
ip address 192.168.1.1 255.255.255.0
ip route 192.168.100.0 255.255.255.0 192.168.1.10

usually static routes are inactive as soon as the next-hop is unreachable...

thnx


Pure Networks
Posted by Ben on December 14, 2004, 9:14 pm
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linkwood wrote:
> I've got a C2600 where I add a static route on the eth interface.
> Why does this static route stay active even when the interface is down?
>
> eg.
> interface ethernet 0/0
> ip address 192.168.1.1 255.255.255.0
> ip route 192.168.100.0 255.255.255.0 192.168.1.10
>
> usually static routes are inactive as soon as the next-hop is
> unreachable...
>
> thnx
Simplest answer is the next hop must still be reachable. Can you post a
show ip route?


Posted by Barry Margolin on December 15, 2004, 12:37 am
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> I've got a C2600 where I add a static route on the eth interface.
> Why does this static route stay active even when the interface is down?
>
> eg.
> interface ethernet 0/0
> ip address 192.168.1.1 255.255.255.0
> ip route 192.168.100.0 255.255.255.0 192.168.1.10
>
> usually static routes are inactive as soon as the next-hop is unreachable...

Cisco performs recursive route lookup. So it will look in the routing
table to determine how to reach 192.168.1.10, in order to use that
static route.

--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***


Posted by Johannes Resch on December 16, 2004, 8:24 pm
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On 2004-12-14 21:00, linkwood wrote:
> I've got a C2600 where I add a static route on the eth interface.
> Why does this static route stay active even when the interface is down?
>
> eg.
> interface ethernet 0/0
> ip address 192.168.1.1 255.255.255.0
> ip route 192.168.100.0 255.255.255.0 192.168.1.10
>
> usually static routes are inactive as soon as the next-hop is
> unreachable...

you need to include the interface in the static route to achieve this.

for your setup, it would be:

ip route 192.168.100.0 255.255.255.0 eth0/0 192.168.1.10

also, the route now has an admin distance of 0 (directly connected)
instead of 1 (default for static route).


HTH,
-jr


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