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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 1 Introduction to PNNI
The Hierarchical PNNI Network Topology
Figure 1-1 Example Single Peer Group Topology
A single peer group topology is the easiest to set up. Since all communications are between nodes in the
same peer group, you do not have to configure connections to other peer groups or to other network
types. If the network will never connect to a public network, you can use most of the default PNNI
configuration settings.
The Cisco switches described in this guide support up to 160 nodes in a single peer group. The
specifications for Cisco switches are described in Table 2-1 in Chapter 2, “Interoperability and
Performance Planning.”
The size of a single peer group is partially limited by the size of the PNNI database and the processing
resources required to maintain it. As the size of the peer group grows, the PNNI database within the node
grows, as does the PNNI processing requirements. When the network size increases beyond the
capabilities of the network nodes, you can connect the single peer group network to other networks to
create the following types of topologies:
• The Hierarchical PNNI Network Topology
• PNNI Internetworking with AINI
• PNNI Internetworking with IISP
The hierarchical PNNI topology enables multiple PNNI peer groups to communicate with each other,
and this increases the total size of the network. The ATM Inter-Network Interface (AINI) and Interim
Inter-Switch Protocol (IISP) protocols enable private PNNI networks to connect to other private or
public PNNI networks. The AINI and IISP protocols enable communications between networks, but
provide a privacy barrier that keeps the network databases in each network private to that network.
The Hierarchical PNNI Network Topology
A hierarchical PNNI network is a topology that interconnects multiple PNNI peer groups to form a larger
network. Figure 1-2 shows an example hierarchical PNNI network topology that interconnects multiple
peer groups.
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PNNI network