300-510 · Question #145
Refer to the exhibit. When implementing SRv6, which SID does R2 propagate into area 0 for the prefix 2001:DB8:1:1/128?
The correct answer is A. 120. In SRv6 (Segment Routing over IPv6), each node is assigned a SID (Segment Identifier) that encodes instructions for packet forwarding. When a prefix is redistributed or propagated between IS-IS areas, the associated SID label value travels with it. In the exhibit's topology, R2…
Question
Refer to the exhibit. When implementing SRv6, which SID does R2 propagate into area 0 for the prefix 2001:DB8:1:1/128?
Exhibit
Options
- A120
- B230
- C110
- D10
How the community answered
(35 responses)- A83% (29)
- B6% (2)
- C3% (1)
- D9% (3)
Explanation
In SRv6 (Segment Routing over IPv6), each node is assigned a SID (Segment Identifier) that encodes instructions for packet forwarding. When a prefix is redistributed or propagated between IS-IS areas, the associated SID label value travels with it. In the exhibit's topology, R2 acts as a Level-1/Level-2 boundary router. The prefix 2001:DB8:1:1/128 originates in an area with SID value 120 assigned at R2's point of redistribution into area 0. R2 propagates SID 120 into area 0 because that is the index/SID value associated with this prefix in R2's segment routing database for the given prefix. The other SID values (230, 110, 10) belong to different nodes or prefixes in the topology as shown in the exhibit.
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