Establishing an MPLS LSP Between Two Sites
Question
You are asked to establish an MPLS LSP between two sites. You are required to ensure the LSP traverses specific routers within your network.
Which solution is correct?
Answers
Explanations
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A. B. C. D.B
To establish an MPLS LSP between two sites while ensuring the LSP traverses specific routers within your network, you can use either LDP or RSVP-TE (Resource Reservation Protocol with Traffic Engineering extensions) to set up the LSP. Both protocols can be used to establish label-switched paths (LSPs) across a network, but they differ in their capabilities and the way they handle traffic engineering.
Option A, enabling traffic engineering within LDP and defining the explicit route the LSP must follow, is not possible. LDP is a label distribution protocol that assigns labels to network paths and does not support traffic engineering. Therefore, it is not capable of defining explicit paths for LSPs.
Option B, implementing RSVP and defining the explicit route the LSP must follow, is possible. RSVP-TE is a protocol extension to RSVP that provides traffic engineering capabilities, including the ability to define explicit paths for LSPs. By using RSVP-TE, you can define a specific path for the LSP to follow, including the specific routers that the LSP must traverse.
Option C, enabling traffic engineering within RSVP and defining the explicit route the LSP must follow, is similar to Option B, but with an additional feature of traffic engineering capabilities. RSVP-TE protocol is used for Traffic Engineering in MPLS network. This option is valid and provides the capability to define an explicit path for the LSP to follow and enables traffic engineering capabilities.
Option D, implementing LDP and defining the explicit route the LSP must follow, is not possible. As mentioned earlier, LDP does not support traffic engineering and cannot define explicit paths for LSPs.
Therefore, the correct solution for establishing an MPLS LSP between two sites while ensuring the LSP traverses specific routers within your network is either B or C. Implementing RSVP-TE or enabling traffic engineering within RSVP and defining the explicit route the LSP must follow can be used to achieve this goal.
