350-501 · Question #45
A network engineer deployed Cisco MPLS TE tunnels on the service provider network to steer the traffic over those tunnels to optimize the bandwidth utilization. Which two configurations can send the…
The correct answer is C. applying the autoroute announce command under the Cisco MPLS TE interface tunnel E. applying an explicit-path command under the Cisco MPLS TE interface tunnel. To steer traffic into Cisco MPLS TE tunnels, the autoroute announce command makes the tunnel an eligible path in the IGP, while applying an explicit-path command defines the tunnel's specific route, enabling its use.
Question
A network engineer deployed Cisco MPLS TE tunnels on the service provider network to steer the traffic over those tunnels to optimize the bandwidth utilization. Which two configurations can send the traffic to the Cisco MPLS TE tunnel interfaces? (Choose two.)
Options
- Aapplying the fast-reroute per-prefix command
- Bstatic route pointing down to the Cisco MPLS TE interface tunnel
- Capplying the autoroute announce command under the Cisco MPLS TE interface tunnel
- Denabling LFA calculation
- Eapplying an explicit-path command under the Cisco MPLS TE interface tunnel
How the community answered
(21 responses)- A10% (2)
- B5% (1)
- C81% (17)
- D5% (1)
Why each option
To steer traffic into Cisco MPLS TE tunnels, the `autoroute announce` command makes the tunnel an eligible path in the IGP, while applying an `explicit-path` command defines the tunnel's specific route, enabling its use.
The `fast-reroute per-prefix` command is a protection mechanism to quickly reroute traffic around failures, not a method for initially steering traffic into a TE tunnel.
While a static route can technically point to a tunnel interface, `autoroute announce` is a more dynamic and integrated method for MPLS TE traffic steering compared to individual static routes.
The `autoroute announce` command, configured under the MPLS TE tunnel interface, advertises the tunnel's destination via the Interior Gateway Protocol (IGP), making the tunnel an eligible path in the routing table for traffic destined to that endpoint.
LFA (Loop-Free Alternate) calculation is a mechanism for fast reroute in IP/IGP networks, not a method for steering traffic into MPLS TE tunnels.
The `explicit-path` command defines the precise sequence of hops an MPLS TE tunnel must traverse. While it defines the tunnel's route rather than directly steering IP traffic, configuring such a path is a fundamental part of establishing a functional TE tunnel that can then be used to forward traffic.
Concept tested: MPLS TE tunnel traffic steering
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/configuration/xe-16/mp-te-xe-16-book/m-te-steering.html
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