Imagine your network with 100 routers or more all connected to the same area. Do you know what will be the size of your ospf database and the ammount of memory and cpu needed to calculate it, and to run SPF in the entire network?
Besides, every single link flap will affect your entire network.
So, its always good to plan and divide your network into multiple areas (when you have a mid-big network).
imagine you connect 2 network and you dont want them to route between each other (maybe 2 customers...) then you'd use 2 ospf instances. you'd have 2 separated dabatase in your router and unless you redistribute between them routers you wont be able to route between the 2 networks.
I've only seen in when working on CCIE work books, but I bet someone is using it somewhere.
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...