Diameter Proxy Mobile IPv6 [RFC5779] AVPs

Diameter Proxy Mobile IPv6 (RFC5779)

This interface defines the AAA interactions required in a Proxy Mobile IPv6 (PMIPv6) domain, detailing how a Mobile Access Gateway (MAG) and a Local Mobility Anchor (LMA) interact with a AAA server—referred to as the home AAA (HAAA) server—to download and update mobile node (MN) specific policy profile information. Leveraging the Diameter protocol [RFC3588], this specification supports dynamic assignment of policy profiles, thus simplifying deployment and maintenance in large PMIPv6 networks.

Purpose of the Diameter Proxy Mobile IPv6 Interface

• Dynamic Policy Profile Management: The interface enables the MAG to download MN-specific policy profile information from a remote policy store co-located with the HAAA server. This functionality is crucial for ensuring that the MAG receives the necessary parameters to manage the mobility session of an authenticated MN.
• AAA-Based Session Management: Once the network authenticates an MN using an access authentication procedure (potentially based on EAP [RFC3748]), the MAG initiates a mobility session by sending a Proxy Binding Update (PBU) to the LMA. The LMA, in turn, utilizes Diameter-based AAA interactions to authorize the PBU and update the subscriber’s mobility session details in the remote policy store.
• Integrated Network Access and Mobility Support: By using the same AAA infrastructure for both network access authentication and mobility session management, the solution streamlines operations and reduces administrative overhead within the PMIPv6 domain.

Key Elements and Operational Workflow

MAG-to-HAAA Interaction:

• During the MN’s network attachment, the MAG (acting as a NAS) queries the HAAA using the Diameter protocol. If the subscriber is authorized for PMIPv6 service, the HAAA returns PMIPv6-specific policy profile information along with the network access authentication answer. This dynamic download of policy profiles eases the operational management of PMIPv6 domains.

LMA-to-HAAA Interaction:

• After a successful authentication, the MAG sends a Proxy Binding Update (PBU) to the LMA. The LMA then interacts with the HAAA to fetch the relevant parts of the subscriber’s policy profile and additional authorization information required for establishing and managing the MN’s mobility session. In this context, the HAAA serves as the remote policy store.

Network Entities:

• Home AAA (HAAA) & Policy Store: Co-located to provide centralized policy management and AAA functionality.
• Local Mobility Anchor (LMA): Receives PBUs from MAGs, fetches policy profiles from the HAAA, and authorizes mobility sessions.
• Mobile Access Gateway (MAG): Acts as the NAS at the network access router, initiating AAA requests and conveying MN-specific policy information.
• Mobile Node (MN): Attaches to the PMIPv6 domain, triggering the AAA-based procedures for authentication and mobility session establishment.

For complete technical specification of Diameter Proxy Mobile IPv6 please refer to: [RFC5779]

package com.mobius.software.telco.protocols.diameter.primitives.rfc5779