Cisco 10000 - Manual (Page 61)

C H A P T E R
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Cisco 10000 Series Router Software Configuration Guide
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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)SB, page 2-4
• 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.
Table 2-1 ATM Service Categories
Parameter CBR VBR-rt VBR-nrt Shaped UBR Unshaped UBR
Priority 0 1 2 3 None