Troubleshooting; Configuring Ve; Introduction To Ve - 3Com MSR 50 Series Configuration Manual

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HAPTER OGICAL

Troubleshooting

Configuring VE

Introduction to VE

Configuring VE
I C
NTERFACE ONFIGURATION
Before troubleshooting, you must determine the VT is used for creating virtual
interfaces for VPN or MP. Then, you can locate the VT failures in a specified
implementation.
Symptom
Virtual interfaces cannot be created.
Solution
The causes may be:
No IP address is configured for the VT. As a result, PPP negotiation fails, so the
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VA interface cannot be brought up.
When PPP authentication parameters are incorrect, PPP negotiation fails if the
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peer device is not the user defined by the local device. As a result, the VA
interface cannot be brought up.
If the IP address (or IP address pool) to be assigned to the peer is not configured
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for the VT, the VA interface cannot provide IP addresses when the peer device
requires the local device to. In this case, the VA interface cannot be brought up.
A virtual Ethernet (VE) interface is a logical interface implemented on interface
boards. VE interfaces are mainly used in point to point protocol over Ethernet over
ATM (PPPoEoA).
PPPoEoA is a structure of 3 layers: the top layer is PPP, the middle layer is PPP over
Ethernet (PPPoE), and the bottom layer is PPPoEoA. Note that the parameters for
PPPoE are configured through VE interfaces on the interface boards of the access
device. Refer to
information.
When configuring a permanent virtual channel (PVC) to transfer PPPoEoA packets,
you must specify a VE interface corresponding to the PVC. Otherwise, PVC cannot
be configured. A VE interface corresponds to only one PVC bearing PPPoEoA. A VE
interface which has been associated with a PVC cannot be removed.
Table 32 Configure a VE Interface
Operation
Enter system view
Create a VE interface
and enter the VE
interface view
n
The configuration of a VE interface is similar to that of an Ethernet interface.
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Refer to "Ethernet Interface Configuration" on page 89
procedure.
"ATM and DSL Interface Configuration" on page 71
Command
system-view
interface
virtual-ethernet
number
Description
-
Required
If the specified VE interface does not exist, this
command first creates the VE interface and
then enters the VE interface view.
You can configure up to 1,024 VE interfaces.
for the configuration
for detailed