Which OSPF LSA should be used as an extension to support MPLS TE?

The correct answer is C. opaque. OSPF Traffic Engineering (OSPF-TE) extensions utilize Opaque LSAs to carry additional link-state information required for MPLS Traffic Engineering. These special LSAs allow OSPF to distribute TE-specific attributes without modifying the core protocol.

MPLS and Segment Routing

Question

Options

Asummary
Bmulticast OSPF
Copaque
Drouter

How the community answered

(27 responses)

A
4% (1)
B
7% (2)
C
89% (24)

Why each option

OSPF Traffic Engineering (OSPF-TE) extensions utilize Opaque LSAs to carry additional link-state information required for MPLS Traffic Engineering. These special LSAs allow OSPF to distribute TE-specific attributes without modifying the core protocol.

Asummary

Summary LSAs (Type 3) are used by ABRs to summarize routes between OSPF areas and do not carry traffic engineering specific information.

Bmulticast OSPF

Multicast OSPF (MOSPF) is a separate protocol for multicast routing and is not the mechanism used to extend OSPF for MPLS Traffic Engineering.

CopaqueCorrect

Drouter

Router LSAs (Type 1) describe a router's links and their state within an area but do not contain the detailed, extensible traffic engineering attributes required by MPLS TE.

Concept tested: OSPF-TE LSA type

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te/configuration/xe-3s/mp-te-xe-3s-book/mp-te-ospf-isis-te.html

Topics

#OSPF#LSA#MPLS TE#Opaque LSA

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