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Cisco PNNI Network Planning Guide for MGX and SES Products, Release 5
Part Number OL-3847-01 Rev. D0, April, 2004
Chapter 3 Address and Closed User Group Planning
Planning Address Configuration Settings
Figure 3-3 PNNI Network Physical Topology
The topology shown in Figure 3-3 becomes a Single Peer Group (SPG) PNNI WAN if no hierarchy is
applied. In an SPG WAN, every node stores information about every other node and the CPE that connect
to it. To distribute information about all the nodes in the WAN, the PNNI switches send PNNI Topology
State Element (PTSE) messages to each other on a regular basis. In a small WAN, an SPG application is
appropriate. When the WAN grows beyond 100 nodes, PTSE distribution and the size of the node PNNI
databases begins to affect network performance. At this point, you might want to consider creating a
Multiple Peer Group (MPG) WAN.
Figure 3-4 shows an example topology of a PNNI MPG WAN.
Figure 3-4 MPG WAN Topology
PNNI network
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