Maintaining Pwe3; Verifying The Connectivity Of A Pw - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN

6.12 Maintaining PWE3

This section describes how to maintain PWE3. Detailed operations include PW connectivity
detection, and PW fault location.

6.12.1 Verifying the Connectivity of a PW

After PWE3 is configured, the PWE3 connectivity can be detected.
Prerequisite
Before using the ping vc and tracert vc commands to check the connectivity of a PW, ensure
that the PWE3 network is correctly configured.
By default, VCCV in Label Alert mode is enabled. Before using the control word channel, run
the control-word command to enable the control word function. After that, VCCV in control
word channel mode is enabled.
When locating faults on the PW, you can use either VCCV in control word channel mode or
VCCV in normal mode.
At present, checking the connectivity of the PW is not supported in the following situations:
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For an MH-PW, the local VC ID and VC type needs to be specified.
In the control word mode, if VC IDs are different, the VC ID of the remote UPE needs to be
specified. In the MPLS Label Alert mode, the addresses of the remote peer SPEs or UPEs need
to be specified.
Because a static PW does not support signaling negotiation, configurations of the UPE control
word on both ends of the PW are different, with the control word being enabled on one end, but
disabled on the other. When the MPLS Label Alert mode is enabled on both ends, the PW can
be Up and the ping vc command can work. CEs, however, cannot communicate with each other
because the control words are different.
Procedure
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SPEs do not support the ping vc and tracert vc command (these commands are supported
only by UPEs).
Multiple users cannot run the command simultaneously. That is, the devices on the two
ends cannot ping a VC at the same time. On a device serving as both a UPE and an SPE,
if the PW serving as an SPE is performing VCCV ping, the PW serving as a UPE will be
unable to perform VCCV ping. That is, two VCCV pings cannot be performed on a same
device at the same time.
The MTU check of the VC is not supported.
Check the connectivity of the PW.
– Control word channel
ping vc pw-type pw-id [ -c echo-number | -m time-value | -s data-bytes | -t timeout-
value | -exp exp-value | -r reply-mode | -v ]
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6 PWE3 Configuration
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control-word [ remote peer-pw-id |
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