JN0-102 · Question #17
Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)
The correct answer is B. LSPs are unidirectional. D. LSPs can follow paths other than the IGP's shortest path. MPLS LSPs are unidirectional, meaning traffic flows in one direction along a specific path from ingress to egress, and they can be engineered to follow paths independent of the IGP's shortest path. This allows for traffic engineering and load balancing beyond standard IP routing.
Question
Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)
Options
- ALSPs are bidirectional.
- BLSPs are unidirectional.
- CLSPs must follow the IGP's shortest path.
- DLSPs can follow paths other than the IGP's shortest path.
How the community answered
(24 responses)- B96% (23)
- C4% (1)
Why each option
MPLS LSPs are unidirectional, meaning traffic flows in one direction along a specific path from ingress to egress, and they can be engineered to follow paths independent of the IGP's shortest path. This allows for traffic engineering and load balancing beyond standard IP routing.
MPLS LSPs are unidirectional, requiring separate paths for inbound and outbound traffic.
MPLS LSPs are inherently unidirectional; a separate LSP must be established for traffic flowing in the reverse direction.
While LSPs can follow the IGP shortest path by default, they do not have to and can be explicitly configured for traffic engineering to use non-shortest paths.
LSPs can be explicitly configured (traffic engineered) to follow specific paths that are not necessarily the shortest path determined by the Interior Gateway Protocol (IGP), enabling policies like load balancing or meeting QoS requirements.
Concept tested: MPLS Label-Switched Paths (LSP) characteristics
Source: https://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/12_2sr/mp_crte.html
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