Chapter 7 Circuits and Tunnels

Server Trails

The server trail link is bidirectional and can be VC3, VC11, VC12, VC4, VC4-2c, VC4-3c, VC4-4c, VC4-6c, VC4-8c, VC4-12c, VC4-16c, VC4-32c, and VC4-64c; you cannot change an existing server trail to another size. It must be deleted and recreated. A circuit provisioned over a server trail must match the type and size of the server trail it uses. For example, an VC4-3c server trail can carry only VC4-3c circuits and not three VC4 circuits.

Note There is no OSPF or any other management information exchange between NEs over a server trail.

7.12.1 Server Trail Protection Types

The server trail protection type determines the protection type for any circuits that traverse it. A server trail link can be one of the following protection types:

Preemptible—PCA circuits will use server trails with the Preemptible attribute.

Unprotected—In Unprotected Server Trail, CTC assumes that the circuits going out from that specific port will not be protected by provider network and will look for a secondary path from source to destination if you are creating a protected circuit.

Fully Protected—In Fully Protected Server Trail, CTC assumes that the circuits going out from that specific port will be protected by provider network and will not look for a secondary path from source to destination.

Note Only SNCP protection is available on server trails. MS-SPRing procection is not available on server trail.

7.12.2 VCAT Circuit Routing over Server Trails

An VC4-3c server trail can be used to route VC4-3c circuits and an VC4 server trail can be used to route VC4 circuits. Similarly, a VC3 server trail can be used to route VC3 circuits.

For example, to route a VC4-3c-2v circuit over a server trail, you must enable split fiber routing and create two VC4-3c server trails and route each member manually or automatically over each server trail. To route a VC4-12c-2v circuit over a server trail, you must enable split fiber routing and create two VC4 server trails and route each member manually or automatically over each server trail.

Note Server trails can only be created between any two optical ports or STM-1E ports.

VCAT circuities can be created over server trails in the following ways:

Manual routing

Automatic routing

Diverse routing: This method enables VCAT circuit routing over diverse server trail links.

Note When creating circuits or VCATs, you can choose a server trail link during manual circuit routing. CTC may also route circuits over server trail links during automatic routing. VCAT common-fiber automatic routing is not supported.

Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2

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Cisco Systems 15310-MA manual Server Trail Protection Types, Vcat Circuit Routing over Server Trails

15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

The Cisco 15310-CL is a versatile platform that primarily serves as a carrier-class router aimed at supporting high-speed data and voice services. It is built to handle the demands of large enterprises and service providers, offering a robust design that ensures maximum uptime and performance. One of its standout features is its modular architecture, which enables users to customize their configurations based on specific application needs. This scalability allows for future expansion without the need for a complete hardware overhaul.

Key technologies integrated into the Cisco 15310-CL include high-density Ethernet interfaces and a comprehensive suite of Layer 2 and Layer 3 protocol support. The device is capable of supporting multiple types of connections, including TDM, ATM, and Ethernet. This flexibility makes it an ideal choice for organizations that require seamless migration between various service types. Moreover, with features such as MPLS (Multiprotocol Label Switching) support and advanced Quality of Service (QoS) mechanisms, the router ensures that critical applications receive the necessary bandwidth and low latency required for optimal performance.

In contrast, the Cisco 15310-MA focuses on access solutions, providing a cost-effective entry point for businesses looking to enhance their network capabilities. It is well-suited for smaller offices or branch locations that need reliable connectivity without the expense and complexity associated with larger systems. The device supports a range of access methods and provides essential features like firewall capabilities, VPN support, and comprehensive security measures to protect sensitive data.

Both models benefit from Cisco's commitment to security and manageability, offering features like enhanced encryption protocols and user authentication mechanisms that help safeguard networks against threats. Additionally, they can be managed through Cisco’s intuitive software tools, simplifying configuration and monitoring tasks for IT administrators.

The Cisco 15310-CL and 15310-MA are ideal solutions for businesses seeking to enhance their network infrastructure, ensuring firms can keep pace with evolving technology demands while maintaining a focus on security and performance. Their combination of advanced features, modular capabilities, and robust support makes them valuable assets in the networking landscape.