Virtual Routing in the Cloud (Ben Story's Library) by Arvind Durai & Stephen Lynn & Amit Srivastava

Author:Arvind Durai & Stephen Lynn & Amit Srivastava
Language: eng
Format: epub
Publisher: Cisco Press
Published: 2016-02-29T16:00:00+00:00

Network Functions Virtualization (NFV) is a cost-effective method to provide virtual route reflector (vRR) functionality compared to traditional deployment using physical hardware. The important thing to keep in mind is to ensure that the deployment of CSR 1000V as a route reflector is not in the data path; you can thereby provide cost-effective capability to manage the BGP control plane that can scale the number of routes in the BGP RIB. Table 5-1 should be used as a mere reference point since these numbers can change based on software release cycle and enhancement in the BGP protocol. Any use case of the CSR 1000V to replace hardware functionality in the design should be done with careful tuning of the hypervisor environment, as discussed in Chapter 3, “Hypervisor Considerations for the CSR.” By default, the IOS XE uses about 50% of the memory for the IOSd process and the remaining memory for other IOS XE processes (valid for RPs with 4GB of memory). Because BGP route reflector is a control plane functionality that runs on the IOSd process only, by default out of 4GB memory available to the CSR 1000V, only 50% of the memory (2GB) will be used for route reflector functionality. To optimize this functionality in the CSR 1000V and to enhance the scalability of the route reflector function, the CSR 1000V with a route reflector license uses the entire 4GB of memory to run the IOSd. The route reflector license available for the CSR 1000V increases its scalability as a route reflector.

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