Cisco 10000-2P2-2DC Software Guide - Page 193
Named Method Lists, Framed-Route VRF Aware
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Chapter 5 Configuring the Layer 2 Tunnel Protocol Access Concentrator and Network Server L2TP Network Server Named Method Lists To configure authentication, authorization, and accounting (AAA), you first define a named list of methods and then apply that list to various interfaces. The named method list defines the types of authentication or accounting to be performed and the sequence in which they will be performed. You must apply the method list to a specific interface before any defined authentication methods are performed. The only exception is the default method list, which is automatically applied to all interfaces except those that have a named method list explicitly defined. A defined method list overrides the default method list. An authentication method list lists the methods to be queried to authenticate users. An accounting method list lists the methods used to support accounting. Method lists enable you to designate one or more security protocols to be used for authentication or accounting, thus ensuring a backup system for authentication or accounting in case the initial method fails. Cisco IOS software uses the first listed method to authenticate users or to support accounting. If that method fails to respond, the Cisco IOS software selects the next authentication or accounting method listed in the method list. This process continues until successful communication with a listed authentication or accounting method occurs, or all methods defined in the method list are exhausted. The Cisco IOS software attempts authentication with the next listed authentication method only when there is no response from the previous method. If authentication fails at any point in this cycle (for example, the RADIUS server responds by denying user access), the authentication process stops and no other authentication methods are attempted. For more information, see the "Configuring Authentication" chapter in the Cisco IOS Security Configuration Guide, Release 12.2. Framed-Route VRF Aware The Framed-Route VRF aware feature allows you to apply static IP routes to a specific VRF table instead of the global routing table. This feature makes RADIUS Attribute 22 (Framed-Route) and a combination of Attribute 8 (Framed-IP-Address) and Attribute 9 (Framed-IP-Netmask) aware of VRF instances. You can configure a per-user static route by using the Framed-Route attribute in any of the following ways: • Using the Cisco route command • Using the RADIUS Framed-Route attribute Note When the PE router receives a Framed-Route attribute from the RADIUS server, the PE determines if the user is a VPN customer. If so, then the static route is implemented in the VRF routing table to which the user belongs. • Using the RADIUS Framed-IP-Address or Framed-IP-Netmask attribute Note The Framed-IP-Netmask attribute has the same function as the Framed-Route attribute. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 5-27
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