l tracert vc pw-type pw-id [ -exp exp-value | -f first-ttl | -m max-ttl | -r reply-mode | -t timeout-
value ] * normal [ remote remote-ip-address ] [ full-lsp-path ] [ draft6 ]
When using the tracert vc command to locate a PW fault, note the following points:
l SPEs do not support the command. The command is supported only by UPEs.
l This command can be used to tracert both an SH-PW and an MH-PW constructed in the LDP
mode.
l When tracing routes of an MH-PW, besides the local PW ID and PW type, you need to specify
the remote PW ID.
The execution of the tracert vc command may be terminated in one of the following situations:
l The device that initiates tracert receives an MPLS Echo Reply packet from the egress device.
l The TTL in the label of the previous MPLS Echo Request packet sent by the device that
initiates tracert reaches the set or default maximum number of hops.
l The user presses Ctrl+C on the device to initiate tracert.
----End
6.12.3 Debugging a PWE3
After a fault occurs in PWE3, a relevant debugging command can be used to debug PWE3,
display debugging information, locate the fault, and analyze the cause.
Context
CAUTION
Debugging affects system performance. After debugging is complete, run the undo
debugging all command to disable debugging immediately.
In the case of operational faults, run the debugging command in the user view to debug the
PWE3 and locate the faults.
In the case of operational faults, run the debugging command in the user view to debug the
PWE3 and locate the faults. For the procedure of outputting the debugging information, refer to
the chapter "Maintenance and Debugging" in the Quidway S7700 Smart Routing Switch
Configuration Guide - Device Management.
Procedure
l Run the debugging mpls lspc { all | error | event | packet } command in the user view to
enable debugging of MPLS ping/tracert.
----End
6.13 Configuration Examples
You can learn the configuration procedures based on the configuration flowchart. Each
configuration example consists of such information as the networking requirements,
configuration notes, and configuration roadmap.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 6 PWE3 Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
588
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