Troubleshooting guide

8-12
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 8 Troubleshooting Tag and MPLS Switching Connections
Troubleshooting Tag Switching Using debug Commands
Troubleshooting Tag Switching Using debug Commands
This section describes debug commands that you can use to troubleshoot tag switching connections on
a switch router.
Use the following commands to debug tag switching connections on a switch router:
For detailed interface configuration information, refer to the “Configuring Tag Switching” chapter in the
ATM Switch Router Software Configuration Guide.
MPLS Overview
MPLS Label Distribution Protocol (LDP), as standardized by the Internet Engineering Task Force
(IETF), and as enabled by Cisco IOS software, allows the construction of highly scalable and flexible IP
Virtual Private Networks (VPNs) that support multiple levels of service.
This section includes the following:
• MPLS Overview, page 8-12
• Troubleshooting MPLS Connections, page 8-19
• Troubleshooting MPLS VPN, page 8-26
• Troubleshooting MPLS ATM Connections, page 8-34
• Debugging MPLS, page 8-44
Command Purpose
debug tag-switching adjacency Debugs tag switching adjacency database
events.
debug tag-switching atm-tdp {api | routes |
states | failure}
Debugs tag switching ATM Tag
Distribution Protocol (TDP) events.
debug tag-switching packets {atm
card/subcard/port | atm-p card/subcard/port | cbr
card/subcard/port | ethernet card/subcard/port |
loopback 0 | null}
Debugs tag switching packets.
debug tag-switching tdp {advertisements |
bindings | directed-neighbors |
pies [received | sent] | session [io | state] |
transport [connections | events | timers]}
Debugs TDP switching events.
debug tag-switching tfib {cef | enc | state | struct
| tsp}
Debugs tag switching TFIB
1
.
1. TFIB = Tag Forwarding Information Base
debug tag-switching traffic-eng {events |
interfaces | metrics | routing-table}
Debugs tag switching traffic engineering.
debug tag-switching tsp-tunnels {events |
signalling | tagging}
Debugs tag switching TSP tunnels.
no debug all Turns off all debugging.