Cisco 10000-2P2-2DC Software Guide - Page 79
Configuring keepalive, Enhancing Scalability of Per-User Configurations, keepalive, ip:vrf-id
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Chapter 2 Scalability and Performance Configuring the Cisco 10000 Series Router for High Scalability Configuring keepalive The keepalive command sets the keepalive timer for a specific interface. To ensure proper scaling and to minimize CPU utilization, set the timer for 30 seconds or longer (Example 2-14). The default value is 10 seconds. Example 2-14 Configuring keepalive for a Virtual Template Interface interface Virtual-Template1 ip unnumbered Loopback1 keepalive 30 no peer default ip address ppp authentication pap Enhancing Scalability of Per-User Configurations To enhance scalability of per-user configurations without changing the router configuration, use the ip:vrf-id and ip:ip-unnumbered RADIUS attributes. These per-user vendor specific attributes (VSAs) are used to map sessions to VRFs and IP unnumbered interfaces. The VSAs apply to virtual access subinterfaces and are processed during PPP authorization. In releases earlier than Cisco IOS Release 12.2(16)BX1, the lcp:interface-config RADIUS attribute is used to map sessions to VRFs. This per-user VSA applies to any type of interface configuration, including virtual access interfaces. Valid values of this VSA are essentially any valid Cisco IOS interface command; however, not all Cisco IOS commands are supported on virtual access subinterfaces. To accommodate the requirements of the lcp:interface-config VSA, the per-user authorization process forces the Cisco 10000 series router to create full virtual access interfaces, which consume more memory and are less scalable. In Cisco IOS Release 12.2(16)BX1 and later releases, the ip:vrf-id attribute is used to map sessions to VRFs. Any profile that uses the ip:vrf-id VSA must also use the ip:ip-unnumbered VSA to install IP configurations on the virtual access interface that is to be created. PPP that is used on a virtual access interface to be created requires the ip:ip-unnumbered VSA. An Internet Protocol Control Protocol (IPCP) session is not established if IP is not configured on the interface. You must configure either the ip address command or the ip unnumbered command on the interface so that these configurations are present on the virtual access interface that is to be created. However, specifying the ip address and ip unnumbered commands on a virtual template interface is not required because any pre-existing IP configurations are removed when the ip:ip-vrf VSA is installed on the virtual access interface. Therefore, any profile that uses the ip:vrf-id VSA must also use the ip:ip-unnumbered VSA to install IP configurations on the virtual access interface that is to be created. These per-user VSAs can be applied to virtual access subinterfaces; therefore, the per-user authorization process does not require the creation of full virtual access interfaces, which improves scalability. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 2-17
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