Which LSA is used for OSPF-TE purposes?
Which LSA is used for OSPF-TE purposes?
For OSPF-TE (Traffic Engineering) purposes, Type 10 LSAs, known as Area local LSAs, are used. Type 10 LSAs are Opaque LSAs that are utilized to carry traffic engineering information within a single OSPF area. This is defined in RFC 3630, which extends OSPF for traffic engineering by using these LSAs. Hence, the correct answer is Type 10 LSA.
OSPF uses a new type of LSA (link state advertisement), the Type 10 Opaque LSA for carrying traffic-engineering information. The Opaque LSAs (Type 9, Type 10, and Type 11) are defined in RFC 2370. This RFC describes the flooding behavior of these LSAs but does not define how they are to be used. The Type 10 LSA is the area local opaque LSA that is flooded within a single area (Figure 14.9). RFC 3630 describes the traffic-engineering extensions for OSPF and uses Type 10 LSAs to flood the trafficengineering information. If there are non-TE-capable routers in an area, they must flood the TE LSAs that they receive.