HORIZONTAL AND OUTSIDE LINKS
Between lowest level nodes, connections are made of PNNI logical links, which consist of the physical links and ATM virtual path connections (VPCs). Figure 9-11 shows two aspects of these links: logical links inside a peer group are called horizontal links, and logical links that connect two peer groups are called outside links. Links between two lowest level nodes in the same peer group cannot be aggregated. For example, if two physical links connect a pair of lowest level nodes they are represented by two separate logical links.
Figure 9-11. Horizontal Links and Outside Links
When a logical link is set up and ...
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