Troubleshooting guide

7-6
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Chapter 7 Troubleshooting LAN Emulation Switching Environments
Initial Troubleshooting of LANE
Step 3 Check the Admin and State fields. They should read up and operational, respectively.
If the Admin field shows “down”, the interface or subinterface is administratively shut down. To reenable
the interface, use the no shutdown command on the interface or subinterface.
Step 4 Check the Join Attempt field. A high number of join attempts might mean that the LECS is unreachable.
To determine the status of the LECS, use the show lane config command.
Step 5 Check the Last Fail Reason field for any of the following messages:
• Link went down
The problem is on the physical layer. Check the cable and the module quality. Physically loopback
the interface and check the status using the show interfaces command.
• Local config changed
The switch detected a configuration change. Force the LANE client to join the ELAN with the
shutdown/no shutdown command sequence on the interface or subinterface.
• Fail to set up config VC
The LANE client cannot establish a VCC to the LECS. This failure might be caused by ILMI, which
must be enabled to provide the ATM address prefix. If ILMI is not functioning, no ATM address
prefix is distributed and no SVCs can be established. Check the LANE component addresses using
the show lane default-atm-addresses command. The following example shows correct output:
EngFl1Ls1#show lane default-atm-addresses
interface ATM13/0/0:
LANE Client: 47.00918100000000E0F75D0401.00E0F75D0402.**
LANE Server: 47.00918100000000E0F75D0401.00E0F75D0403.**
LANE Bus: 47.00918100000000E0F75D0401.00E0F75D0404.**
LANE Config Server: 47.00918100000000E0F75D0401.00E0F75D0405.00
note: ** is the subinterface number byte in hex
If ILMI is not suppling the ATM address prefix, the output appears as follows:
EngFl1Ls1#show lane default-atm-addresses
interface ATM13/0/0:
LANE Client: ...00E0F75D0402.**
LANE Server: ...00E0F75D0403.**
LANE Bus: ...00E0F75D0404.**
LANE Config Server: ...00E0F75D0405.00
note: ** is the subinterface number byte in hex
Use the show atm ilmi-status command to verify that the ILMI PVC is well defined. For more
information on configuring ILMI, refer to the “Configuring ILMI” chapter in the
ATM Switch Router Software Configuration Guide.
• Config VC being released
The LECS address is incorrect or unreachable. If the LANE client could not reach the LECS, the
show lane client command output looks like the following:
EngFl1Ls1#show lane client
LE Client ATM13/0/0.1 ELAN name: eng_elan Admin: up State: initialState
Client ID: unassigned Next join attempt in 93 seconds
Join Attempt: 3909
Known LE Servers: 0
Last Fail Reason: Config VC being released
HW Address: 0030.80ce.3a02 Type: ethernet Max Frame Size: 1516
ATM Address: 47.00918100000000E04FACB401.003080CE3A02.01
VCD rxFrames txFrames Type ATM Address
0 0 0 configure 47.007900000000000000000000.00A03E000001.00