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Virtual Prefixes: an Illustration Mappings for a given virtual super-prefix are stored only at selected routers These routers advertise the virtual prefix into BGP Customer Site CE2 24.1.1.0/24 ETR ITR1 ITR2 Prefix TE Source ETR ---- BGP ITR2 ---- BGP 24.1.1.0/24 ETR Mapping Prefix TE Source ETR ---- BGP 24.1.1.0/24 ETR Mapping Virtual Prefix Adv. 24.0.0.0/8 24.0.0.0/8 ---- BGP 24.1.1.1 24.1.1.1 24.1.1.1 ETR |