Troubleshooting guide

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ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Debugging MPLS
Debugging MPLS
This section outlines the debug commands used to troubleshoot the MPLS interface configuration.
Use the following debug commands to check the MPLS configuration and setup processes:
Command Purpose
debug mpls ldp advertisements Incorporates two new keywords/parameters; displays
information about the advertisement of labels and interface
addresses to LDP peers.
debug mpls ldp bindings Shows information about addresses and label bindings
learned from LDP peers by means of LDP Downstream
Unsolicited label distribution. This command incorporates
two new keywords/parameters.
debug mpls ldp messages Shows specific information (such as message type, source,
and destination) regarding LDP messages sent to and
received from LDP peers. This command incorporates
several new keywords/parameters.
debug mpls ldp session io Shows the contents of LDP messages sent to and received
from LDP peers. This command incorporates two new
keywords/parameters.
debug mpls ldp session
state-machine
Incorporates one new keyword/parameter; displays
information about state transitions for LDP sessions.
debug mpls ldp transport
connections
Incorporates two new keywords/parameters; displays
information about the TCP connections used to support LDP
sessions.
debug mpls ldp transport
events
Shows information about events related to the LDP peer
discovery mechanism. This command incorporates two new
keywords/parameters.
debug mpls atm-tdp {api |
routes | states}
Shows information related to routing events, states and
Label VC establishment and release.
no debug all Turns off all debugging.