CHAPTER
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Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
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Multiprotocol Label Switching Checklist
This chapter provides a checklist to troubleshoot the Multiprotocol Label Switching (MPLS) protocol.
You can collect information from the sample output on all routers for the following commands to
troubleshoot the problems in MPLS:
• show tech-support mpls rsvp
• show tech-support mpls traffic-eng
• show tech-support routing ospf
• show tech-support routing isis
For more detailed information about the show tech-support commands, see Cisco IOS XR Advanced
System Command Reference for the Cisco CRS-1 Router.
Multiprotocol Label Switching Recommendations
Follow these recommendations to troubleshoot Multiprotocol Label Switching (MPLS):
• Ve r i f y t h e show commands for the MPLS control plane to ensure that there is no problem.
• Ensure that the hardware is programmed correctly for Multiprotocol Label Switching (MPLS)
Traffic Engineering (TE) and Label Distribution Protocol (LDP).
• Ensure that there are no communication problems in the MPLS infrastructure. If the control plane
has some problems, determine if they are due to the following reasons:
–
Communication problems in the Resource Reservation Protocol (RSVP) infrastructure . In
certain instances, the tunnel is not up though the topology is correct and the RSVP messages are
lost.
–
Communication problems with the MPLS-TE infrastructure .
• Verify the sample output from the applicable show tech-support commands on all routers in the
entire network topology. Copy the output to the applicable TFTP location.
–
For MPLS-TE issues, verify the output from the show tech-support mpls traffic-eng, show
tech-support mpls rsvp, show tech-support routing ospf, and show tech-support routing
isis commands.
–
For MPLS LDP issues, verify the output from the show tech-support mpls ldp command.
• Provide a topology diagram that indicates the applicable platform.
• Specify the symptom of the problem. For example, for an MPLS-TE tunnel, the problem is detected
at the head, middle, or tail of a tunnel.
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