When configuring traffic engineering tunnels in Cisco MPLS core network, you see the traffic is not tacking the expected path in the core. Which command do you use to quickly check path of a TE tunnel?
show mpls traffic-engineering tunnels will clearly show the signaled path, explicit or dynamic, but "quickly" as a keyword probably suggests the traceroute answer is more correct
As the question says, we already know the traffic doesn't take the expected path. So we need to check the tunnel signaling on the head end router.
I think B should be the correct answer here.
Given that the question asks for a way to check the current path that the Traffic Engineering (TE) tunnel is taking, regardless of whether it is correct or not, the best command would be:
D. traceroute mpls ipv4 <tunnel destination>
This command allows you to trace the path that MPLS-labeled packets are taking through the network to the tunnel's destination. It provides a hop-by-hop analysis, showing where the traffic is actually going, which can help you determine why the tunnel might not be following the expected path.
While show mpls traffic-eng tunnels provides detailed information about the TE tunnels, including the configured and actual paths, traceroute mpls ipv4 is more useful when you want to actively trace the real-time path of traffic through the MPLS network, regardless of the tunnel configuration.
We know that it's not tackling the correct path. Question is asking what should we do to check the path of the TE. Meaning, to see where it is going, regardless if it's correct or not.
D is correct.
Must be D
"As Multiprotocol Label Switching (MPLS) deployments increase and the traffic types they carry increase, the ability of service providers to monitor label switched paths (LSPs) and quickly isolate MPLS forwarding problems is critical to their ability to offer services. The MPLS LSP Ping, Traceroute, and AToM VCCV feature helps them mitigate these challenges."
It is a TE tunnel. Does not follow the LSP but a preconfigured path.. So trace mpls makes no sense.. The proper command is show mpls traffic-eng tunnel... But we dont have this choice here.... No command show mpls traffic-engINEERING tunnel exist..
D is not right because traffic to tunnel destination IP is not going via the tunnel. Anyway, if D would be true, imagine having 2 tunnels configured to that destination, each with own path...
I vote for B
imma post the question for you again, I think you missed something
Cisco MPLS core network, you see the traffic is not tacking the expected path in the core
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