If the link fails between R2 and R4, R1 should stop using it, but only after network convergence. If the link goes "down" at the hardware level, convergence is generally rapid. However, if the link remains "up" but neighbor contact is lost, you'll need to wait for OSPF to detect that. How fast depends on the hello timer settings.
If the link is actually down, you should only have one route in the routing table. If you don't want it to load share EVER, set max-paths to 1 under the OSPF router config.
If you have a link down, the network is then effectively a line. If you still have two routes you need to look at why. For that a little more info on the details would help - what are the links - LANs? Serial links?
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...