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Bandwidth Sizing

Introduction

The LSP bandwidth sizing feature enables Routing Director to periodically compute a new planned bandwidth for each bandwidth sizing-enabled LSP. Based on aggregated LSP traffic statistics, Routing Director can reprovision the LSP with the new planned bandwidth.

It provides a systematic approach to adjust the bandwidth of LSPs by assessing their current and planned bandwidth needs. This feature automates the decision-making process by comparing the existing bandwidth allocation against newly calculated requirements, guided by predefined thresholds. Routing Director can determine which LSPs require resizing based on the LSP's provisioning type and current bandwidth status.

Note: Bandwidth sizing feature is applicable for:

  • LSPs with provisioning method as PCEP during provisioning of new LSPs. This feature is not available when you provision LSPs using NETCONF.

  • RSVP and SR LSPs.

  • Delegated and PCE-initiated LSPs as they can be re-signaled using PCEP.

Benefits of LSP Bandwidth Sizing

  • Optimizes network resource allocation by dynamically adjusting LSPs based on real-time bandwidth requirements, leading to more efficient utilization of network infrastructure.

  • Enhances network stability by ensuring planned bandwidth conforms to predefined maximum and minimum limits, preventing overuse or under utilization of network capacity.

  • Improves operational efficiency through automated decision-making processes, reducing the need for manual intervention and enabling faster responses to changing network conditions.

Implement Bandwidth Sizing

To implement bandwidth sizing in your network:

  1. Enable traffic engineering while creating a device profile. For more information, see Add a Device Profile.
  2. Enable bandwidth sizing at the organization level. For more information see, Manage Organization Settings.
  3. Enable the Bandwidth Sizing option for each LSPs and set the minimum and maximum bandwidth thresholds to define the limits for bandwidth adjustments . For more information, see Add a Tunnel.
After you perform these steps, Routing Director fetches all bandwidth sizing-enabled LSPs, obtains the aggregated LSP traffic for the time duration that you have specified in Adjustment Period, determines if the bandwidth of the LSPs need to be changed, and then reprovisions those LSPs whose bandwidth need to be changed.

The minimum and maximum bandwidth settings that you have set at the LSP-level are crucial in bandwidth sizing, serving as boundaries for bandwidth adjustments. The maximum bandwidth sets an upper limit, preventing the signaled bandwidth from exceeding a certain value even if traffic spikes occur. Conversely, the minimum bandwidth ensures that the bandwidth does not fall below a specified threshold, maintaining a baseline level of reservation regardless of low traffic levels. These settings help manage network resources efficiently and accommodate varying traffic conditions.