300-510 · Question #152
Refer to the exhibit. An engineer working for a private telecommunication company with an employee id 4115 46 881 is enabling a segment routing solution with these requirements. - A service provider…
The correct answer is B. Option B. Option B correctly configures PE1's loopback with prefix-sid index 0, allocating the very first label (16000) from Cisco's default SRGB range (16000–23999), and assigns PE2's loopback a prefix-sid index of 500 or greater, satisfying the minimum 500-label gap requirement between…
Question
Refer to the exhibit. An engineer working for a private telecommunication company with an employee id 4115 46 881 is enabling a segment routing solution with these requirements.
- A service provider is using the default range for prefix SID.
- PE1 must allocate the first SID from the default range for the
loopback address
- PE1 and PE2 loopback SID allocation should have a minimum difference
of 500. Which configuration must be implemented to meet the requirements?
Exhibits
Options
- AOption A
- BOption B
- COption C
- DOption D
How the community answered
(46 responses)- A11% (5)
- B83% (38)
- C4% (2)
- D2% (1)
Explanation
Option B correctly configures PE1's loopback with prefix-sid index 0, allocating the very first label (16000) from Cisco's default SRGB range (16000–23999), and assigns PE2's loopback a prefix-sid index of 500 or greater, satisfying the minimum 500-label gap requirement between the two PEs.
Why the distractors fail:
- Option A likely uses
prefix-sid absolute 16000for PE1 (correct value, wrong keyword context) or assigns PE2 an index that creates less than a 500-unit difference. - Option C likely modifies the global-block range, violating the "default range" requirement - any explicit SRGB reconfiguration disqualifies it.
- Option D probably assigns PE1 a non-zero index (e.g., index 1, yielding label 16001 instead of 16000), missing the "first SID" requirement, or gives PE2 an index too close to PE1's.
Memory tip: Think "index 0 = first slot, index 500 = minimum gap." In Cisco SR-MPLS, the default SRGB starts at 16000 - index 0 maps to 16000, index 500 maps to 16500. If the question says "first SID" and "500 difference," mentally write index 0 for PE1 and index ≥ 500 for PE2.
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