I ran into this situation on a recent project and thought it would make an excellent question on an exam. It could be worded something like this:
What is the behavior of a router or Layer 3 switch when a dynamic route is learned that partially overlaps with a directly connected network?
- The router reboots
- The network reboots
- That's um-possible
- None of the above
The worst feeling for a geek:
This has happened to me twice now: upgrading Mac OS X from one release to another and after the dust settles, the search function in Outlook 2011 totally breaks and always returns “no results”. As we all know, email sucks and being able to deftly search through that mound of crap in your mail client is the only thing that makes it somewhat bearable.
Normally I talk about overlays in the context of data center/SDN/cloud but today I'm going out into left field and am going to talk about voice! :-)
I freely admit that I'm a noob when it comes to Cisco voice so I'm not sure if the behavior I'm about to describe is obvious or not. It wasn't obvious to me and I only figured it out after running into the issue for real and troubleshooting it to resolution.
The issue stems from my misunderstanding about how dual-line ephone-dns function when used in an overlay.