OSPF has special restrictions when multiple areas are involved. If more than one area is configured, one of these areas has to be Area 0. This is called backbone. When designing networks it is good practise to start with Area 0 and then expand into other areas later on.
The Backbone has to be center for all other areas ie., all areas have to be physically connected to Backbone. The reason behind that is that OSPF expects all areas to inject routing information into the backbone and in turn the backbone will disseminate that information into other areas.
To just startup & run with only as "Single Area OSPF", any Area can be defined with any process id.
Dude, consider a scenario where four of my interfaces on a router are each in separate area. But they all talk to each other without any backbone configured. If a backbone (area0)is req for inter-area communication, how does the above communication take place.
1. There is a default route being advertised into all the areas from the one router connected to all of them. This would draw all the interarea traffic to the one router in the network with full routing knowledge.
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...