Chapter 7 Circuits and Tunnels

7.10.1 Bandwidth Allocation and Routing

7.10.1 Bandwidth Allocation and Routing

Within a given network, CTC routes circuits on the shortest possible path between source and destination based on the circuit attributes, such as protection and type. CTC considers using a link for the circuit only if the link meets the following requirements:

•The link has sufficient bandwidth to support the circuit.

•The link does not change the protection characteristics of the path.

•The link has the required time slots to enforce the same time slot restrictions for BLSR. If CTC cannot find a link that meets these requirements, an error appears.

7.10.2Secondary Sources and Destination

CTC supports secondary sources and destinations (drops). Secondary sources and destinations typically interconnect two third-party networks, as shown in Figure 7-6. Traffic is protected while it traverses a network of ONS 15600s.

Figure 7-6 Secondary Sources and Drops

Primary source

Vendor A

network

Secondary source

ONS 15600 network

Primary destination

Vendor B

network

Secondary destination

81199

Several rules apply to secondary sources and destinations:

•CTC does not allow a secondary destination for unidirectional circuits because you can specify additional destinations after you create the circuit.

•Primary and secondary sources should be on the same node.

•Primary and secondary destinations should be on the same node.

•Secondary sources and destinations are permitted only for regular STS connections.

For bidirectional circuits, CTC creates a path protection connection at the source node that allows traffic to be selected from one of the two sources on the ONS 15600 network. If you check the Fully Path Protected option during circuit creation, traffic is protected within the ONS 15600 network. At the destination, another path protection connection is created to bridge traffic from the ONS 15600 network to the two destinations. A similar but opposite path exists for the reverse traffic flowing from the destinations to the sources.

For unidirectional circuits, a path protection drop-and-continue connection is created at the source node.

Cisco ONS 15600 Reference Manual, R7.2

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Cisco Systems ONS 15600 manual Bandwidth Allocation and Routing, Secondary Sources and Destination
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ONS 15600 specifications

Cisco Systems ONS 15600 is a highly versatile optical networking platform designed to meet the demands of modern telecommunications and data services. This multiservice edge platform supports various transmission mediums and offers a wide array of features that enable efficient data transport. Ideal for service providers and large enterprises, the ONS 15600 is engineered to provide scalable and reliable optical transport solutions.

One of the notable features of the ONS 15600 is its capability to support multiple protocols, including SONET/SDH, Ethernet, OTN, and legacy TDM services. This flexibility allows users to tailor their networks according to specific service requirements while ensuring interoperability with existing infrastructure. The platform is designed to facilitate seamless service migration, accommodating both legacy and next-generation services.

The modular architecture of the ONS 15600 enhances its scalability. It allows for easy expansion by incorporating additional line cards or interface modules without requiring significant downtime. This modularity ensures that service providers can evolve their networks over time, responding to increasing bandwidth demands and new service offerings with ease.

Incorporating advanced technologies, the ONS 15600 employs Dense Wavelength Division Multiplexing (DWDM), significantly increasing the capacity of fiber networks by allowing multiple signals to be transmitted simultaneously over a single optical fiber. This capability helps to optimize fiber utilization and reduce operational costs. In addition, the platform supports Optical Transport Network (OTN) for improved error detection and correction, contributing to higher reliability and performance.

Another key characteristic of the ONS 15600 is its robust management capabilities. The platform can be managed through Cisco's Optical Networking Manager (ONM), providing a centralized interface for network configuration, monitoring, and troubleshooting. This enhances operational efficiency and minimizes downtime, allowing service providers to focus on delivering quality services to their customers.

The ONS 15600 also prioritizes security, offering various features like encryption and access control to safeguard sensitive data during transmission. With its combination of scalability, flexibility, and security, the Cisco ONS 15600 stands out as a reliable choice for organizations looking to enhance their optical networking capabilities while meeting the evolving demands of the digital landscape. Its commitment to quality and performance makes it a cornerstone of modern optical networks.
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