Cisco 10000-2P2-2DC Software Guide - Page 63

2 C H A P T E R Scalability and Performance The infrastructure of the service provider must be capable of supporting the services the enterprise customer or Internet service provider (ISP) wants to offer its subscribers. It must also be able to scale to an expanding subscriber base. You can configure the Cisco 10000 series router for high scalability. This chapter discusses the following topics: • Line Card VC Limitations, page 2-1 • Limitations and Restrictions, page 2-3 • Scaling Enhancements in Cisco IOS Release 12.2(33)XNE, page 2-4 • Scaling Enhancements in Cisco IOS Release 12.2(33)SB, page 2-5 • Scaling Enhancements in Cisco IOS Release 12.3(7)XI1, page 2-6 • Scaling Enhancements in Cisco IOS Release 12.3(7)XI2, page 2-7 • Scaling Enhancements in Cisco IOS Release 12.2(28)SB, page 2-8 • Configuring the Cisco 10000 Series Router for High Scalability, page 2-8 • Using the RADIUS Attribute cisco-avpair="lcp:interface-config", page 2-20 • Using Full Virtual Access Interfaces, page 2-20 • Preventing Full Virtual Access Interfaces, page 2-21 Line Card VC Limitations The Cisco 10000 series router supports four ATM service categories for virtual circuits (VCs): • Constant Bit Rate (CBR) • Variable Bit Rate-nonreal-time (VBR-nrt) • Unspecified Bit Rate (UBR) with a peak cell rate (PCR), referred to as shaped UBR • UBR without a PCR, referred to as unshaped UBR The segmentation and reassembly (SAR) mechanism configures priority and additional traffic management parameters for the various ATM service categories. Table 2-1 lists the priority levels the SAR sets for the service categories. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 2-1