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Chapter 5 AN100U/UX Troubleshooting
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configuration available is the configuration using subscriber unit VLAN tagging, as detailed
above, though this would require some external hardware to strip and add VLAN tags
appropriately, upstream of the AN100U/UX.
Troubleshooting the Data Path
The purpose of this section is to describe a step-by-step procedure for diagnosing data
connectivity problems. It will examine each section of the data path and describe how to
identify potential problems at each stage of the path.
Note
It is crucial that a steady source of data traffic be present across the wireless link
in question.
The procedures below make use packet/byte counters, which require traffic in order to be
meaningful. A simple ping between two hosts on either end of the link should be sufficient,
but sending UDP packets using iPerf will make it easier to distinguish any potential
background traffic. You can use iperf to send obvious spikes in traffic rates.
Note
You must send test traffic in the direction that you are testing. Do not send traffic in
both directions.
Common Issues
Most connectivity issues are due to improper classification. Before proceeding, make
absolutely sure that your classification is done properly:
•
If you're classifying based on VLAN tags, make sure that your switches are configured
properly, or that your computers recognize and accept VLAN-tagged traffic.
•
If you are classifying based on MAC addresses, make sure that you've specified the
source and/or destination MAC addresses properly.
•
Make sure that you are not trying to classify using wildcard MAC addresses on more
than one service flow in the downstream direction. You can use wildcard classifiers on
all subscriber units upstream, but you cannot do this in the downlink, because all
classifiers must be unique.
•
If you are not expecting VLAN-tagged traffic in your network, make sure that subscriber
unit tagging is disabled. Do this by typing "show ethTag".
Step 1
Step 2
Enter the following command:
ethTag show