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4.7. Virtual Links

OSPF virtual links for IPv4 are described in Section 15 of [OSPFV2]. Virtual links are the same in IPv6, with the following exceptions:

  • LSAs having AS flooding scope are never flooded over virtual adjacencies, nor are LSAs with AS flooding scope summarized over virtual adjacencies during the database exchange process.

  • The IPv6 interface address of a virtual link MUST be an IPv6 address having global scope, instead of the link-local addresses used by other interface types. Hence, a link-LSA SHOULD NOT be originated for a virtual link.

  • The virtual neighbor's IPv6 address is an IPv6 address with global scope. The neighbor advertises its virtual link's IPv6 interface address in an intra-area-prefix-LSA originated for the virtual link's transit area.

  • Virtual links are assigned unique Interface IDs, which are advertised in Hellos sent over the virtual link and in the router's router-LSAs.

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