Ensure LSP traverses specific routers: The correct solution

B

On the ingress router, create an explicit-path LSP, and specify the transit routers between the ingress and egress routers. In this configuration, no constrained- path computation is performed. For the primary path, all intermediate hops are strictly specified so that its route cannot change. The secondary path must travel through router 14.1.1.1 first, then take whatever route is available to reach the destination. The remaining route taken by the secondary path is typically the shortest path computed by the IGP. http://www.juniper.net/documentation/en_US/junos15.1/topics/example/mpls-lsp-explicit-path-configuring.html

To establish an MPLS LSP between two sites and ensure the LSP traverses specific routers within your network, you need to define the explicit path that the LSP must follow. The explicit path is a preconfigured path that the LSP should take, rather than relying on the routing protocol to determine the path dynamically.

Option A: Enable traffic engineering within LDP and define the explicit route the LSP must follow.

LDP (Label Distribution Protocol) is used to distribute labels for forwarding packets in an MPLS network. Traffic engineering (TE) is a set of techniques used to optimize traffic flows in a network. Enabling traffic engineering within LDP would allow you to define an explicit route for the LSP to follow. However, LDP TE is not widely used and may not be supported by all devices in your network.

Option B: Implement RSVP and define the explicit route the LSP must follow.

RSVP (Resource Reservation Protocol) is a signaling protocol used to reserve resources along a path in a network. By implementing RSVP, you could define the explicit route for the LSP to follow. RSVP is widely used and supported by many devices in a network.

Option C: Enable traffic engineering within RSVP and define the explicit route the LSP must follow.

Enabling traffic engineering within RSVP would also allow you to define an explicit route for the LSP to follow. This option is similar to Option B but takes advantage of the TE capabilities within RSVP.

Option D: Implement LDP and define the explicit route the LSP must follow.

Implementing LDP alone without enabling traffic engineering would not allow you to define an explicit route for the LSP to follow. Therefore, this option is not the correct solution for this scenario.

In conclusion, the correct solution for establishing an MPLS LSP between two sites and ensuring the LSP traverses specific routers within your network would be Option B or Option C, as they both involve defining an explicit route using RSVP, which is widely used and supported by many devices in a network.