Cisco ASR1002 Configuration Guide - Page 243
Redefining User Profiles to Use the ip:vrf-id and ip:ip-unnumbered VSAs - weight
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Broadband Scalability and Performance Walk-by User Support for PWLAN in ISG Redefining User Profiles to Use the ip:vrf-id and ip:ip-unnumbered VSAs The requirement of a full virtual access interface when using the lcp:interface-config VSA in user profiles can result in scalability issues, such as increased memory consumption. This situation is especially true when the Cisco ASR 1000 Series Router attempts to apply a large number of per-user profiles that include the lcp:interface-config VSA. Therefore, when updating your user profiles, we recommend that you redefine the lcp:interface-config VSA to the scalable ip:vrf-id and ip:ip-unnumbered VSAs. The following example shows how to redefine a VRF named newyork using the ip:vrf-id VSA: Change: Cisco:Cisco-Avpair = "lcp:interface-config=ip vrf forwarding newyork" To: Cisco:Cisco-Avpair = "ip:vrf-id=newyork" The following example shows how to redefine the Loopback 0 interface using the ip:ip-unnumbered VSA. Change: Cisco:Cisco-Avpair = "lcp:interface-config=ip unnumbered Loopback 0" To: Cisco:Cisco-Avpair = "ip:ip-unnumbered=Loopback 0" Walk-by User Support for PWLAN in ISG In public wireless LAN (PWLAN) setups, a high number of ISG sessions might be unauthenticated sessions from wireless devices that do not use the PWLAN service. These sessions are referred to in this document as walk-by sessions, and users that use these sessions are referred to as walk-by users. Walk-by sessions, if not dealt with in an optimized way, may consume a large portion of the hardware resources. This resource utilization may lead to an increase in the number of ISG routers required for a given PWLAN deployment. The concept of light-weight sessions is introduced to provide an optimization for walk-by sessions. The features for walk-by users are configured on a default session acting as a template. Walk-by users are then assigned light-weight sessions that inherit features from a default session. The features are configured only once on the default session, thereby optimizing the resource usage. A lite session is a light-weight unauthenticated ISG session that inherits default session services. Lite sessions are created on ISG to support walk-by users and optimize resource usage. A timer may be specified to limit the duration for which the lite session can utilize the public wireless LAN (PWLAN) services while remaining unauthenticated. Restrictions for Walk-by Session Support for PWLAN in ISG The restriction pertaining to the Walk-by Session Support for PWLAN in ISG feature includes: • On the ASR 1000 Series router, the Layer 4 Redirect (L4R) feature supports a maximum of 16 translation entries per walk-by session. For more information on the limit for the total number of translations on the system, see Layer 4 Redirect Scaling, page 4. Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 9