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Troubleshooting a Data Link Layer Problem
308656-14.00 Rev 00
5-3
4.
Redisplay the MIB objects in Tab l e 5 - 1 after 1 minute; then, compare the
values to determine which errors are currently occurring.
Table 5-2
lists specific attributes to check and describes possible actions.
Table 5-1. First Set of ATM Interface MIB Objects to View
MIB Object Description Quick Get Path
wfAtmInterfaceConfEntry*
* The instance ID associated with this object is the line number.
Shows the configuration of the
ATM port, including the aggregate
cell rate and maximum number of
VCs on the port.
wfLine
>
wfAtmInterfaceGroup
>
wfAtmCommonGroup
>
wfAtmInterfaceConfTable
wfAtmVclConfEntry Shows the VCL configuration,
including the mode (direct, group,
or hybrid) and the cell rates
(burst, sustainable, or peak).
wfLine
>
wfAtmInterfaceGroup
>
wfAtmCommonGroup
>
wfAtmVclConfTable
wfAtmVclStatsEntry Shows the number of cells
received and transmitted, and the
number of frames dropped on
specific VPIs or VCIs.
wfLine
>
wfAtmInterfaceGroup
>
wfAtmCommonGroup
>
wfAtmVclStatsTable
Table 5-2. ATM Interface Attributes for Troubleshooting
Attribute Description Action
wfAtmVclRcvCrcErrs Shows the number of errors
due to line noise.
Check for defective
fiber media.
wfAtmVclRcvMaxLenExceedErrs Shows the number of
packets coming from the
ATM code and sent to the
driver for transmission that
exceeded the maximum
transmission unit (MTU)
configured on the VCL.
Check the
configuration of the
MTU, and consider
increasing the MTU.
wfAtmVclRcvInvalidLenErr Shows the number of
segmentation and
reassembly (SAR) frames
that contain a length error
after protocol data unit
(PDU) reassembly.
Check dropped-frame
statistics; then, locate
the dropped frames by
checking the path of
cells through the
network.
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