Cisco 10000-2P2-2DC Software Guide - Page 100

Configuration Tasks for RA to MPLS VPN Chapter 3 Configuring Remote Access to MPLS VPN address-family vpnv4 neighbor 10.1.1.4 activate neighbor 10.1.1.4 send-community both neighbor 10.3.1.4 activate neighbor 10.3.1.4 send-community both exit-address-family ! Note Typically, you enable BGP only on the PE routers. It is not necessary to enable BGP on all provider (P) core routers. However, if your network topology includes a route reflector, you may then enable BGP on a core router, which might be a P or PE router. Configuring Access Protocols and Connections The Cisco 10000 series router supports the following access protocols: • PPP over ATM • PPP over Ethernet • RBE over ATM When a remote user initiates a PPPoA or PPPoE session to the Cisco 10000 series router, a predefined configuration template is used to configure a virtual interface known as a virtual access interface (VAI). The VAI is created and configured dynamically by using a virtual template interface. When the user terminates the session, the VAI goes down and the resources are freed for other client uses. Note Virtual template interfaces and VAIs do not apply to RBE over ATM. The virtual template interface is a logical entity that the Cisco 10000 series router applies dynamically as needed to a connection. It is a configuration for an interface, but it is not tied to the physical interface. The VAI uses the attributes of the virtual template to create the session, which results in a VAI that is uniquely configured for a specific user. After you configure a virtual template, configure the virtual connection that will use the template and then apply the template to the connection. The order in which you create virtual templates and configure the virtual connections that use the templates is not important. However, both the virtual templates and connections must exist before a remote user initiates a session to the Cisco 10000 series router. The following sections describe how to create a virtual template and apply it to a VAI. For more information, see the "Configuring Virtual Template Interfaces" chapter in the Cisco IOS Dial Technologies Configuration Guide, Release 12.2. Note If you are using a RADIUS server, the RADIUS configuration takes precedence over the virtual template interface configuration. For example, the RADIUS configuration might override a number of parameters with the remainder of the configuration coming from the virtual template interface. To configure access protocols and connections, perform the following configuration tasks. The first task listed is required and you can perform any of the remaining tasks as needed: • Configuring a Virtual Template Interface, page 3-17 • Configuring PPP over ATM Virtual Connections and Applying Virtual Templates, page 3-18 • Configuring PPPoE over ATM Virtual Connections and Applying Virtual Templates, page 3-18 3-16 Cisco 10000 Series Router Software Configuration Guide OL-2226-23