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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 2 Scalability and Performance
Scaling Enhancements in Cisco IOS Release 12.2(28)SB
In Cisco IOS Release 12.3(7)XI2, the subinterfaces on a given main interface share the single system
queue of the main interface, which allows for 32,000 subinterfaces with a three-queue model that
supports assured forwarding (AF) queues and expedited forwarding (EF) queues, in addition to the
default best effort (BE) queues. Because a system queue does not exist for every subinterface, this setup
frees up queues for a 4-queue model.
VC Scaling
When configured for hierarchical shaping, ATM line cards support the following number of VCs:
• E3/DS3 line card supports a maximum of 4,096 VCs
• OC-12 ATM line card supports a maximum of 16,384 VCs (previously 14,436)
• OC-3 ATM line card supports a maximum of 8,191 VCs
Scaling Enhancements in Cisco IOS Release 12.2(28)SB
In Cisco IOS Release 12.2(28)SB, up to 16,384 L2TP tunnels are supported. Because of a limit on the
number of VPDN groups supported, it is not possible to configure 16,384 tunnel definitions using the
CLI. Configure the remaining tunnel definitions using RADIUS.
Configuring the Cisco 10000 Series Router for High Scalability
To ensure high scalability on the Cisco 10000 series router, perform the following configuration tasks:
• Configuring Parameters for RADIUS Authentication, page 2-9
• Configuring L2TP Tunnel Settings, page 2-9
• VPDN Group Session Limiting, page 2-10
• Disabling Cisco Discovery Protocol, page 2-10
• Disabling Gratuitous ARP Requests, page 2-11
• Configuring a Virtual Template Without Interface-Specific Commands, page 2-11
• Monitoring PPP Sessions Using the SNMP Management Tools, page 2-13
• SNMP Process and High CPU Utilization, page 2-13
• CISCO-ATM-PVCTRAP-EXTN-MIB, page 2-14
• Configuring the Trunk Interface Input Hold Queue, page 2-15
• Configuring no atm pxf queuing, page 2-15
• Configuring atm pxf queuing, page 2-16
• Configuring keepalive, page 2-17
• Enhancing Scalability of Per-User Configurations, page 2-17
• Placing PPPoA Sessions in Listening Mode, page 2-19
• Placing PPPoA Sessions in Listening Mode, page 2-19
• Scaling L2TP Tunnel Configurations, page 2-19