Troubleshooting guide

7-7
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 7 Troubleshooting LAN Emulation Switching Environments
Initial Troubleshooting of LANE
Try the following actions to connect the LANE client with the LECS:
– If the remote ATM switch is not a Cisco device, verify that the LECS address is advertised by
ILMI. If it is not, use the well-known address of the LECS.
– If the LECS ATM address is not explicitly configured on the LANE client switch, configure it
with the atm lecs-address-default command.
– If the LECS ATM address has been explicitly configured on the LANE client switch, compare
the LECS ATM address on the LANE client switch, using the show lane client command, with
the LECS ATM address on the switch hosting the LECS, using the show lane config command.
Also check that the LECS is up and operational.
• Receiving negative config response
The LECS refuses to connect to the ELAN. This is usually due to a configuration mistake, such as
incorrectly specifying the ELAN type or name. Try the following actions to resolve the problem:
– Check the LANE client ELAN type and name in the configuration, using the show lane client
command. Remember that the ELAN names are case sensitive.
– If the ELAN membership is restricted, use the show lane database command to verify that the
LANE client ATM address is specified in the LANE database.
– Use the show lane server command to verify that the LES connected to the LECS. The LES
should have the same LECS ATM address information as a client.
• Control Direct VC being released
The LANE client could not connect to the LES. The LES is either unreachable or misconfigured. If
the LES address is hardcoded in the configuration, check the ATM address of the LES on the device
where it is located, using the show lane server command. Compare that address with the ATM
address configured for the LES on the LANE client switch, using the show lane database command.
• Receiving negative join response
The LES refuses to connect. Try the following actions to resolve the problem:
– If the ELAN is restricted, check the LANE database configuration, using the show lane
database command, to ensure that it includes the ATM address of the LANE client.
– If the LANE client and LES are configured on the same subinterface and the ATM address of
the LES is explicitly configured with the lane server-atm-address command, the LANE client
might be trying to contact a backup LES. These connection requests will be refused. Verify this
with the show lane client and show lane server commands. To correct this situation, configure
the LES on a different subinterface.
Step 6 Check the ATM Address column in the virtual channel circuit (VCC) configuration table. These ATM
addresses should be propagated as follows:
• Configure, should be the same as the LECS ATM address
• Direct and distribute, should be the same as the LES ATM address
• Send and forward, should be the same as the LANE BUS ATM address
Step 7 Confirm that the rxFrames and txFrames columns contain values greater than 0.