350-501 · Question #412
Refer to the exhibit. An engineer must implement a traceroute operation to verify the R1 point-to- multipoint LSP connections. The traceroute operation must return all labels and hop-by-hop IP…
The correct answer is C. traceroute mpls traffic-eng tunnel-mte 10 ttl 4. To verify point-to-multipoint MPLS Traffic Engineering LSP connections and gather hop-by-hop label and IP information for all branches, the traceroute mpls traffic-eng tunnel-mte command is used with the specified maximum hop count.
Question
Refer to the exhibit. An engineer must implement a traceroute operation to verify the R1 point-to- multipoint LSP connections. The traceroute operation must return all labels and hop-by-hop IP addresses for destinations 10.20.0.1, 10.30.0.1, and 10 40.0.1, and the maximum number of hops is 4. Which command must be executed to meet the requirements?
Exhibit
Options
- Atraceroute mpls ipv4 10.30.0.1/32 fec-type generic
- Btraceroute mpls ipv4 10.20.0.1/32 ttl 4
- Ctraceroute mpls traffic-eng tunnel-mte 10 ttl 4
- Dtraceroute mpls traffic-eng tunnel-mte 10 responder-id 10.40.0.1
How the community answered
(39 responses)- A3% (1)
- B10% (4)
- C82% (32)
- D5% (2)
Why each option
To verify point-to-multipoint MPLS Traffic Engineering LSP connections and gather hop-by-hop label and IP information for all branches, the traceroute mpls traffic-eng tunnel-mte command is used with the specified maximum hop count.
traceroute mpls ipv4 is used for tracing LDP or IP-routed MPLS paths to a single IPv4 destination, not specifically for P2MP Traffic Engineering LSPs.
Similar to A, traceroute mpls ipv4 targets a single destination and does not provide comprehensive tracing for a P2MP TE tunnel's multiple branches.
The traceroute mpls traffic-eng tunnel-mte 10 ttl 4 command is specifically designed for tracing MPLS Traffic Engineering point-to-multipoint (P2MP) tunnels. It traces all branches of the P2MP LSP associated with tunnel ID 10, providing label and IP address information for each hop to all configured destinations (leaves), and the ttl 4 option limits the trace to the required maximum number of hops.
The responder-id option in traceroute mpls traffic-eng tunnel-mte is used to trace a specific branch to a single leaf of a P2MP tunnel, not all destinations or branches as required by the question.
Concept tested: MPLS TE P2MP traceroute
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/command/mpls-cr-a-d/mpls-cr-a-d-chapter_010.html#wp4029141065
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