300-510 · Question #219
What is a feature of SRGB label values?
The correct answer is D. They are assigned to segment routing nodes and have global significance throughout the domain. The Segment Routing Global Block (SRGB) is a reserved label range on a node from which prefix SIDs are allocated. SRGB-based prefix SIDs have global significance throughout the SR domain: every node must use a consistent SRGB range so that a given SID index maps to the same…
Question
What is a feature of SRGB label values?
Options
- AThey are used for adjacency segment identifiers.
- BThey allow IS-IS and OSPF to use overlapping ranges on a domain.
- CThey are locally significant.
- DThey are assigned to segment routing nodes and have global significance throughout the domain.
How the community answered
(26 responses)- A4% (1)
- B4% (1)
- D92% (24)
Explanation
The Segment Routing Global Block (SRGB) is a reserved label range on a node from which prefix SIDs are allocated. SRGB-based prefix SIDs have global significance throughout the SR domain: every node must use a consistent SRGB range so that a given SID index maps to the same label value across all nodes, enabling end-to-end label-switched paths without per-hop label negotiations. Choice A is incorrect-adjacency SIDs are locally significant and are not drawn from the SRGB. Choice B is incorrect-overlapping SRGB ranges across the same domain would break end-to-end forwarding. Choice C is incorrect because SRGB labels are globally (not locally) significant.
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