300-510 · Question #212
Refer to the exhibit. Unified MPLS is implemented on this network to provide end-to-end services. A network engineer noticed that R3 is failing to receive labels from R1. However, R2 is receiving…
The correct answer is B. Add the send-label keyword in the R1 neighbor statement for R3. In Unified MPLS (also called seamless MPLS), BGP is used to distribute MPLS labels between routers. The 'send-label' keyword in a BGP neighbor statement enables the router to attach MPLS labels to BGP-advertised prefixes for that specific peer. Since R3 can ping R1 (IP…
Question
Refer to the exhibit. Unified MPLS is implemented on this network to provide end-to-end services. A network engineer noticed that R3 is failing to receive labels from R1. However, R2 is receiving labels from R1. R3 can ping R1 normally. Which action resolves the issue?
Options
- AAdd the cdp run command to the link configuration between R1 and R3.
- BAdd the send-label keyword in the R1 neighbor statement for R3.
- CConfigure R1 to run Unified MPLS on both interfaces.
- DDisable mpls Ip on the link between R1 and R3.
How the community answered
(42 responses)- A5% (2)
- B81% (34)
- C12% (5)
- D2% (1)
Explanation
In Unified MPLS (also called seamless MPLS), BGP is used to distribute MPLS labels between routers. The 'send-label' keyword in a BGP neighbor statement enables the router to attach MPLS labels to BGP-advertised prefixes for that specific peer. Since R3 can ping R1 (IP reachability exists) but is not receiving labels, the BGP neighbor statement on R1 for R3 is missing the 'send-label' keyword. R2 already receives labels because its neighbor statement on R1 includes 'send-label'. Adding this keyword to R1's neighbor statement for R3 resolves the label distribution failure.
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