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MPLS and VPN Architectures, Volume II by Jeff Apcar, Ivan Pepelnjak, Jim Guichard

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Advanced Features for MPLS VPN Remote Access

The previous sections have covered basic integration of remote access technologies (dial-up, DSL, and cable) into the MPLS VPN environment. This section covers some advanced Cisco IOS features that you can use with remote access and includes the following:

  • On-demand address pools (ODAPs)

  • Per-VRF AAA

  • DHCP relay—VPN support

ODAPs

In most dial-up scenarios, the dial-in server supplies an IP address to the dial-in user (or router). You can allocate the IP addresses to PPP sessions by using a variety of methods:

  • Statically configured using the RADIUS Framed-IP-address attribute.

  • Local address pools that can be either overlapping or nonoverlapping. Overlapping/nonoverlapping local pools are implemented and ...

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