Which role does the Adjacency-SID sub-TLV extension perform in the IS-IS routing protocol?

Question

Options

• AIt is advertised within TLV-136 (Extended IP Reachability) to label a specific node in the network.
• BIt is advertised within TLV-145 (IS-IS Prefix Reachability Information) to label host prefixes on
• CIt is advertised within TLV-24 (IS-IS Neighbor Adjacency Attribute) to label a specific adjacency
• DIt is advertised within TLV-22 (Extended IS Reachability) to label a specific link in a segment

• B
  5% (1)
• C
  10% (2)
• D
  86% (18)

Explanation

A new IS-IS sub-TLV is defined: the Adjacency Segment Identifier (Adj-SID) sub-TLV. The Adj-SID sub-TLV is an optional sub-TLV carrying the Segment Routing IGP-Adjacency-SID as defined in [RFC8402] with flags and fields that may be used, in future extensions of Segment Routing, for carrying other types of SIDs. IS-IS adjacencies are advertised using one of the IS Neighbor TLVs below: TLV-22 (Extended IS reachability) [RFC5305] TLV-222 (MT-ISN) [RFC5120] TLV-23 (IS Neighbor Attribute) [RFC5311] TLV-223 (MT IS Neighbor Attribute) [RFC5311] TLV-141 (inter-AS reachability information) [RFC5316] Multiple Adj-SID sub-TLVs MAY be associated with a single IS Neighbor.

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