Troubleshooting guide

Contents
viii
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
CHAPTER 8 Troubleshooting Tag and MPLS Switching Connections 8-1
Tag Switching Overview 8-1
How Tag Switching Works 8-2
Troubleshooting Tag Switching Example 8-2
Initial Troubleshooting of Tag Switching 8-3
Troubleshooting TDP Neighbors 8-8
Troubleshooting Tag Switching on VP Tunnels 8-9
Troubleshooting Tag Switching Using debug Commands 8-12
MPLS Overview 8-12
How MPLS Works 8-13
Distribution of Label Bindings 8-14
MPLS Example 8-17
Troubleshooting MPLS Connections 8-19
Verifying CEF Switching 8-20
Verifying MPLS 8-23
Pinging Neighbors 8-24
Verifying Label Distribution 8-24
Verifying Label Bindings 8-25
Troubleshooting MPLS VPN 8-26
Troubleshooting MPLS VPN Fast Ethernet Example 8-27
Verifying VRF Configurations 8-27
Verifying Routing Information 8-28
Verifying Labels 8-30
Pinging VPN Connection Neighbors 8-33
Troubleshooting MPLS ATM Connections 8-34
Troubleshooting MPLS VPN ATM Example 8-34
Verifying ATM Interface VRF Configurations 8-35
Verifying Routing Information 8-36
Verifying Labels 8-39
Pinging ATM VPN Connections 8-42
Debugging MPLS 8-44
CHAPTER 9 Troubleshooting CES Connections and Network Clocking 9-1
CES Overview 9-1
Performing Basic Checks 9-2
CES Example Network 9-4
Initial Troubleshooting of CES 9-4
Checking the CES Circuit Status 9-5