Which feature allows an MPLS TE tunnel to be used by an IGP at the headend of the tunnel?
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A. B. C. D. E.D.
References:
The feature that allows an MPLS TE (Traffic Engineering) tunnel to be used by an IGP (Interior Gateway Protocol) at the headend of the tunnel is the MPLS TE autoroute announce.
MPLS TE is used to provide traffic engineering capabilities in MPLS networks. It enables the creation of tunnels that can be used to steer traffic along specific paths in the network, based on traffic engineering requirements.
An IGP, on the other hand, is a protocol that is used to distribute routing information within an autonomous system (AS). IGPs are used to calculate the shortest path between two nodes in the network, based on the network topology.
When an MPLS TE tunnel is created, it is not automatically used by the IGP at the headend of the tunnel. The headend needs to announce the tunnel to the IGP, so that the IGP can calculate the shortest path through the tunnel.
The MPLS TE autoroute announce feature enables the headend router to automatically announce the MPLS TE tunnel to the IGP, so that the IGP can use the tunnel for forwarding traffic. When this feature is enabled, the headend router automatically generates a route for the tunnel in the IGP routing table.
Therefore, option D, MPLS TE autoroute announce, is the correct answer to the given question. The other options are different MPLS TE-related features, but they do not specifically enable an MPLS TE tunnel to be used by an IGP at the headend of the tunnel.