Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Connected routes

I was asked if a router can route between connected subnetworks just after its startup & loading. No configuration was added. Does anyone knows if that can happen?

6 REPLIES
Hall of Fame Super Blue

Re: Connected routes

Hi

Do the interfaces on the router have ip addresses assigned ?

Jon

New Member

Re: Connected routes

Hi Jon,

The answer to your question is no.

So as you can see by the replies below there will be no routing going on unless you have the IP address configured and the interfaces are not in admin down state.

Thanks for your reply.

Gilson

Silver

Re: Connected routes

Just after its startup and with no configuration in it a router will not route packets between its interfaces. Routing is enabled by default but no interface parameters are on the configuration. Once you have IP addresses on the interfaces then it will route to directly connected interfaces only.

Hall of Fame Super Silver

Re: Connected routes

Gilson

In addition to the points made by Jon and Phil, if the router just booted up and no configuration was added it is very likely that the interfaces are in the admin down state. This would also prevent routing between the interfaces.

HTH

Rick

New Member

Re: Connected routes

Rick,

Thanks for the reply - yes you are correct. When you first boot a router the interfaces are in the admin down state and the routing will not happen.

Regards,

Gilson

New Member

Re: Connected routes

Yes, you are correct - if you do not configure the ip address ubder the interface you want to route it will not route (layer 3 is not active).

Thanks for your reply.

469
Views
0
Helpful
6
Replies