Troubleshooting guide

9-7
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 9 Troubleshooting CES Connections and Network Clocking
Troubleshooting CES Using debug Commands
Troubleshooting CES Using debug Commands
This section describes debug commands that you can use to troubleshoot CES circuits on an ATM switch
router.
Use the following commands to debug CES connections on an ATM switch router:
For detailed interface configuration information, refer to the “Configuring Circuit Emulation Services”
chapter in the ATM Switch Router Software Configuration Guide.
Troubleshooting Network Clocking
This section describes how to troubleshoot problems with the network clocking configuration. For more
information on network clocking, refer to the “Network Clock Synchronization” chapter in the Guide to
ATM Technology and the “Initially Configuring the ATM Switch Router” chapter in the
ATM Switch Router Software Configuration Guide.
Overview of Network Clocking
Network clocking facilities generate or derive a clock signal and distribute it throughout a network to
ensure synchronized network operation. This is important in delay-sensitive data types, such as voice
and video, because these types of data must be received and transmitted at the same rate at every step,
or hop, in a connection. If network synchronization is lost, data might be lost due to buffer overflow or
underflow; cyclic redundancy check (CRC) errors might also occur.
Command Purpose
debug ces-iwf connection Debugs CES circuit connection events.
debug ces-iwf createloc cbr card/subcard/port
[vpi] {on | off}
Enables cell loss for debugging purposes.
debug ces-iwf dcu Debugs CBR-DCU internal events.
debug ces-iwf internal Debugs CES internal events.
no debug all Turns off all debugging.