PNNI HIERARCHY AND THE LOWEST HIERARCHICAL LEVEL

The PNNI architecture is based on a hierarchical structure. Nodes are associated with a level in a hierarchy and nodes that belong to the same hierarchy are in the same peer group. An example of the PNNI hierarchy is provided in Figure 9-5. The routing hierarchy is now divided into two hierarchies; that is, peer groups. For this example, the two groups are called peer group A and peer group B.

Figure 9-5. The Lowest Hierarchical Level and Two Peer Groups

The peer group is a set of nodes that are grouped together to create a routing hierarchy. And here, we introduce the concepts of a logical ...

Get IP Routing Protocols now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.