Modeled Network Examples

This chapter provides examples of typical optical networks you can model using Cisco MetroPlanner.

This chapter contains the following sections:

Supported Cisco MetroPlanner Topologies

Bus Topologies

Hubbed Ring Topology

Meshed Topology

3.1  Supported Cisco MetroPlanner Topologies

Cisco MetroPlanner supports the following topologies:

•Bus (single span, point-to-point, and linear)

•Open (or hubbed) ring

•Closed (or meshed) ring

An example of each topology is given in this chapter.

3.2  Bus Topologies

Bus topologies comprise three types of topologies: single span, point-to-point, and linear.

3.2.1  Single-Span Topology

Figure 3-1 shows an example of a single-span topology. Single-span topologies are characterized by a single span link. The single-span configuration only supports two terminal sites (full terminal or flexible channel-count terminal) without any intermediate line amplifier or optical add/drop multiplexing (OADM) sites.

Figure 3-1 Single-Span Topology Example

3.2.2  Point-to-Point Topology

Figure 3-2 shows an example of a point-to-point topology. In a point-to-point topology, all the wavelengths are terminated at the same point in the chain. In the point-to-point configuration, no channels are added or dropped in intermediate sites.

Figure 3-2 Point-to-Point Topology Example

3.2.3  Linear Topology

Figure 3-3 shows an example of a linear topology. Linear configurations are characterized by the presence of two terminal sites (full terminal or flexible channel-count terminal). Between the two terminal sites, OADM or line amplifiers nodes can be inserted. In a linear configuration, specific wavelengths are terminated at different points in the chain and only unprotected traffic can be provisioned.

Figure 3-3 Linear Topology Example

3.3  Hubbed Ring Topology

Figure 3-4 shows an example of a hubbed ring topology. In this configuration, at least one of the sites must be a hub site, where all channels are terminated.

Figure 3-4 Hubbed Ring Topology Example

3.4  Meshed Topology

Figure 3-5 provides an example of a meshed ring topology. A meshed ring is characterized by the absence of a hub node.

Figure 3-5 Meshed Ring Topology Example