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6.5 | ![]() |
Multiarea OSPF Operation | |
6.5.7 | ![]() |
Opaque LSAs |
Opaque LSAs provide a means to allow for
the future extensibility of OSPF. The information contained in opaque LSAs may be used directly by OSPF or indirectly by applications
wishing to distribute information throughout an OSPF domain. For
example, the OSPF opaque LSA may be used for traffic engineering with
MPLS.
Opaque LSAs are Types 9, 10, and 11 link-state advertisements. Opaque LSAs consist of a standard LSA header followed by a 32-bit aligned application specific information field. Like any other LSA, the opaque LSA uses the link-state database distribution mechanism for flooding this information throughout the topology. The link-state type field of the opaque LSA identifies the topological distribution range of LSA. This range is referred to as the flooding scope. The flooding scope associated with each opaque link-state type is defined as follows:
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