350-501 · Question #136
Refer to the exhibit. All listed MPLS TE tunnels have the autoroute feature enabled. All MPLS TE tunnels are up and running. Which two statements about this configuring are true? (Choose two.)
The correct answer is A. Traffic entering on PE27 marked with an EXP value of 1 is sent via MPLS TE Tunnel 2. B. The outgoing interface towards the tail-end router is MPLS TE Tunnel 100. In this MPLS TE EXP bundle configuration, traffic with an EXP value of 1 is routed via MPLS TE Tunnel 2, and MPLS TE Tunnel 100 functions as the outgoing interface towards the tail-end router for the bundle.
Question
Refer to the exhibit. All listed MPLS TE tunnels have the autoroute feature enabled. All MPLS TE tunnels are up and running. Which two statements about this configuring are true? (Choose two.)
Exhibit
Options
- ATraffic entering on PE27 marked with an EXP value of 1 is sent via MPLS TE Tunnel 2.
- BThe outgoing interface towards the tail-end router is MPLS TE Tunnel 100.
- CPackets with an EXP value of 3 is assigned to MPLS TE Tunnel 1 because of an unmatched
- DThe EXP bundle master tunnel is not functional because of a signaling failure.
- EPackets marked with an EXP value of 3 are switched via MPLS TE Tunnel 4.
- FPackets with unmapped EXP values are forwarded directly via MPLS TE Tunnel 100.
- GPackets marked with an EXP value of 5 are load balanced across MPLS TE Tunnel 1 and MPLS
How the community answered
(59 responses)- A73% (43)
- C14% (8)
- D2% (1)
- E2% (1)
- F7% (4)
- G3% (2)
Why each option
In this MPLS TE EXP bundle configuration, traffic with an EXP value of 1 is routed via MPLS TE Tunnel 2, and MPLS TE Tunnel 100 functions as the outgoing interface towards the tail-end router for the bundle.
MPLS TE EXP bundles allow specific EXP values to be mapped to individual member tunnels for differentiated forwarding. This statement indicates that EXP value 1 is explicitly configured to use MPLS TE Tunnel 2.
Within an MPLS TE EXP bundle, a master or default tunnel is often designated to act as the primary or outgoing interface for the entire bundle, especially for unmapped traffic or as a fallback. This statement identifies MPLS TE Tunnel 100 in this role.
This statement describes an assignment for EXP value 3 to Tunnel 1 due to an 'unmatched' condition, which contradicts typical explicit EXP mapping and the provided correct options.
The question explicitly states that 'All MPLS TE tunnels are up and running,' directly contradicting a signaling failure.
This statement proposes an alternative, potentially incorrect, mapping for EXP value 3 to MPLS TE Tunnel 4.
While plausible if Tunnel 100 is the bundle master, this is a more specific outcome that may be encompassed by statement B, which describes the general role of Tunnel 100 as the outgoing interface for the bundle.
Load balancing for specific EXP values across multiple tunnels requires explicit configuration and is not necessarily implied by the default operation of an EXP bundle for a single EXP value.
Concept tested: MPLS TE EXP bundles and autoroute announce
Source: https://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/12_2sx/t_mteexp.html
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