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This chapter provides troubleshooting information for connectivity and performance problems in LAN Emulation (LANE) switching environments. The ATM Forum defined the LANE specification so that legacy LAN users can take advantage of the benefits of ATM without requiring modifications to end-station hardware or software. For an overview of LANE on an ATM switch, see the chapter "Configuring LAN Emulation," in the LightStream 1010 ATM Switch Software Configuration Guide.
Before you begin, make sure that all physical port connections are working correctly. (See the chapter "Troubleshooting ATM Switch Interface Connections.")
This chapter contains the following sections:
This section describes the example of LANE troubleshooting used throughout this chapter. The example network described here is part of the example network described in the chapter "Example Network."
A single emulated LAN consists of a 155 multimode fiber physical connection between the ATM switch (EngFl1Ls1) and the Catalyst 5000 Fast Ethernet switch (EngFl1Cas1) in the engineering building. The ATM switch is configured as the LANE emulation configuration server (LECS), the LAN Emulation server (LES), and the LAN Emulation broadcast-and-unknown server (LANE BUS).
The LANE example network for the engineering building, see Figure 6-1, is configured as follows:
This section describes how to use the Internet Control Message Protocol (ICMP) ping command to test for connectivity between the ATM switch, router, or an Ethernet switch.
To test for Ethernet connectivity, perform the following task:
| Command | Task |
|---|---|
Test the configuration using the ping command. The ping command sends an echo request to the host, which is specified in the command line. |
Follow these steps to troubleshoot LANE connections:
Step 1 Use the ping command to confirm the connection between the ATM switch (EngFl1Ls1) and the Catalyst 5000 (engFl1Ca1) in the engineering building:
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 msStep 2 Check the Success rate field. It should indicate 100 percent. This indicates that the ICMP packet was sent and returned.
If the success rate is less that 100 percent, continue with the following test to determine the problem with the LANE configuration. Refer to the chapter "Configuring LAN Emulation," in the LightStream 1010 ATM Switch Software Configuration Guide for configuration information.
Use the following commands to test the LANE connection status and performance:
| Command | Task |
|---|---|
Show the LAN emulation default ATM address. | |
Show the LAN emulation connection status. | |
Show the LAN emulation client connection status. |
Follow these steps to confirm the LANE LECS, LES, and BUS configuration:
Step 1 Use the show lane default-atm-address command at the LANE component designated as the LECS, LES, and BUS to determine the addresses.
Step 2 Use the show lane command to confirm the LAN emulation configuration of the ATM switch.
Admin: up State: operational
ATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto)
LE Server ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operational
type: ethernet Max Frame Size: 1516
ATM address: 47.00918100000000E04FACB401.00E04FACB403.01
LE BUS ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operational
ATM address: 47.00918100000000E04FACB401.00E04FACB404.01Step 3 Check the Admin (Administration) and State fields. They should be up and operational respectively.
Step 4 Check the ATM address of this LECS field. This ATM address should match the ATM address in the LANE configuration server displayed in Step 1.
Step 5 Within the LE Server section of the display, check the ELAN name field. It should match the name configured.
Step 6 Check the ATM Address field. This ATM address should match the address displayed in step 1 in the LANE Server field. The ATM address is appended with the corresponding subinterface number in hexadecimal.
Step 7 Within the LE BUS section of the display, check the ELAN name field. It should match the name configured. To determine the ELAN name use the show lane database command and check the default elan field.
Step 8 Check the ATM Address field. This ATM address should match the address displayed in step 1 in the LANE Server field. The ATM address is appended with the corresponding subinterface number in hexadecimal.
If any of these fields do not match the actual LANE configuration, refer to the chapter "LANE Configuration," in the Lightstream 1010 ATM Switch Software Configuration Guide and correct the configuration.
Use the following command to test the LANE connection status and performance:
| Command | Task |
|---|---|
Show the connection status of the LAN emulation client. |
Follow these steps to confirm the configuration of the LANE client:
Step 1 Use the show lane client command to confirm the LAN emulation client of the LightStream 1010 switch at ATM subinterface 13/0/0/.1
LE Client ATM13/0/0.1 ELAN name: eng_elan Admin: up State: initialState
Client ID: unassigned Next join attempt in 83 seconds
Join Attempt: 11Step 2 Check the ELAN name field. This should match the ELAN name configured.
Step 3 Check the Admin (Administration) and State fields. They should read up and operational respectively.
Step 4 Check the Join Attempts field.
Step 5 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 6 Check that the rxFrames and txFrames columns contain values greater that 0.
The LANE configuration server assigns individual clients to particular emulated LANs by directing them to the LANE server that corresponds to the emulated LAN. The LANE configuration server maintains a database of LANE client ATM or Media Access Control (MAC) addresses and their emulated LANs.
To display the configuration of the LANE client database binding, complete the following step, beginning in global configuration mode:
| Command | Task |
|---|---|
Display the LANE client database binding. |
Follow these steps to confirm the configuration of the LANE database:
Step 1 Use the show lane database command to display the default binding of the LANE database of the ATM switch in the engineering building.
LANE Config Server database table 'eng_dbase' bound to interface/s: ATM13/0/0
server 47.00918100000000E04FACB401.00E04FACB403.01 (prio 0)Step 2 Check the LANE Config Server database table field. It indicate the binding of the LANE client to the LANE database.
Step 3 Check the server field. The ATM address displayed should correspond to the ATM address shown in using the show lane default-atm-address command in step 1of the previous section "Check Basic LANE Configuration."
If the LANE client configuration server database is set up incorrectly, refer to the chapter "Configuring LAN Emulation," in the LightStream 1010 ATM Switch Software Configuration Guide for configuration information.
This section outlines the debug commands used to troubleshoot the LANE setup and signalling.
Use the following debug commands to check the LANE configuration and setup processes:
| Command | Task |
|---|---|
debug lane client {all | le-arp | packet | signaling | state | topology} | Debug all LANE client setup processes. |
debug lane client signal interface atm card/subcard/port | Debug LANE client signalling processes for a specific ATM interface. |
Debug all LANE setup processes. | |
Debug all LANE LECS setup processes. | |
debug lane server interface atm card/subcard/port | Debug LANE server processes for a specific ATM interface. |
debug lane signal interface atm card/subcard/port | Debug LANE signalling processes for a specific ATM interface. |
Turn off all debugging. |
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