This feature allows IPv6 destination lookups in two distinct routing tables and applies only to the 7750 SR and 7950 XRS. IPv6 packets within a Virtual Private Routed Network (VPRN) service is able to perform a lookup for IPv6 destination against the Global Route Table (GRT) as well as within the local VPRN.
Currently, VPRN to VPRN routing exchange is accomplished through the use of import and export policies based on Route Targets (RTs), the creation of extranets. This new feature allows the use of a single VPRN interface for both corporate VPRN routing and other services (for example, Internet) that are reachable outside the local routing context. This feature takes advantage of the dual lookup capabilities in two separate routing tables in parallel.
This feature enables IPv6 capability in addition to the existing IPv4 VPRN-to-GRT Route Leaking feature.