Intermec MobileLAN 21 Series System Manual page 187

General Troubleshooting (continued)
Problem/Question
You cannot connect to the
access point using an SNMP
management station.
The end device cannot connect
to the network.
The end device cannot synch
to the access point.
The end devices are unable to
roam to another 21XX.
Managing, Troubleshooting, and Upgrading the 21XX
Possible Solution/Answer
Verify that you did not disable the SNMP Access field in the
Security screen.
•
Choose AP Connections from the Maintenance menu
and verify that the MAC address of your end device
appears on your PC screen. If it does not appear, your
device is not communicating with the access point.
Check your radio configuration settings.
•
Verify that the access point is not filtering out the type
of traffic you are trying to pass through it.
If you are using 802.11b or 802.11a radios:
•
Verify that the end device and the access point have the
same SSID (network name).
If you are using OpenAir radios:
1. Verify that the end device and access point have the
same LAN ID, security ID, channel, and subchannel.
2. Verify that the access point is configured as a master
and that the end device is configured as a station.
If you are using 902 MHz radios:
•
Verify that the end device and the access point have the
same LAN ID and mode-channel.
If you are using S-UHF radios:
•
Verify that the end device and the access point have the
same frequency.
Roaming through switches requires backward learning,
which is part of the IEEE 802.1D standard. If switches in
your network do not support backward learning, you can
create a data link tunnel to force all radio traffic through a
fixed point so that roaming is transparent to the bridges or
switches.
To create a data link tunnel
1. Enable Ethernet bridging on the root access point
2. Disable Ethernet bridging on all other access points that
are separated from the root access point by a bridge or
switch that does not support backward learning.
For more information, see Chapter 4, "Configuring the
Spanning Tree."
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