Source Prefix Advertisement for Intra-domain SAVNET

This document describes a mechanism for intra-domain source address validation (SAV), called Source Prefix Advertisement (SPA) for Intra- domain SAVNET (Intra-domain SPA). The mechanism enables intra-domain routers to generate accurate SAV rules by leveraging routing information together with SAV-specific information, including Source Entity Identifiers (SEIs) and Hidden Prefix (HP). Intra-domain SPA improves the precision and reliability of source address validation, addressing challenges such as asymmetric routing and the use of hidden prefixes by legitimate source entities.