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This chapter presents troubleshooting information for connectivity and performance problems in LAN Emulation (LANE) switching environments. The ATM Forum defined the LANE specification to allow legacy LAN users to take advantage of ATM's benefits without requiring modifications to end-station hardware or software. For an overview of LANE on the ATM switch, see the chapter "Configuring LAN Emulation," in the LightStream 1010 ATM Switch Software Configuration Guide.
This section assumes that you have confirmed all physical port and network connections are working correctly using the information in the chapters "Troubleshooting ATM Switch Interface Connections" and "Troubleshooting ATM Switch Network Connections."
This chapter is separated into the following:
This section describes the example of LANE troubleshooting used throughout the rest of this chapter and is a 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:
LANE configuration troubleshooting is described in the following sections:
The following 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. |
Use the following 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:
EngFl1Ls1# ping 172.20.52.100 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.20.52.100, timeout is 2 seconds: !!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms EngFl1Ls1# ping 172.20.52.20 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.20.52.20, timeout is 2 seconds: !!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms EngFl1Ls1#
Step 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.
This section describes basic steps to use to find problems with the LANE configuration that would cause the connections to fail.
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. |
Use the following 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.
Switch# show lane default-atm-address interface ATM13/0/0: LANE Client: 47.00918100000000E04FACB401.00E04FACB402.** LANE Server: 47.00918100000000E04FACB401.00E04FACB403.** LANE Bus: 47.00918100000000E04FACB401.00E04FACB404.** LANE Config Server: 47.00918100000000E04FACB401.00E04FACB405.00 note: ** is the subinterface number byte in hex Switch#
Step 2 Use the show lane command to confirm the LAN emulation configuration of the ATM switch.
Switch#show lane LE Config Server ATM13/0/0 config table: eng_dbase
Admin: up State: operational LECS Mastership State: active master list of global LECS addresses (7 seconds to update): 47.00918100000000E04FACB401.00E04FACB405.00 <-------- me
ATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto) the above address has NOT yet been registered with ILMI actual user specified form: ... cumulative total number of unrecognized packets received so far: 0 cumulative total number of config requests received so far: 0 cumulative total number of config failures so far: 0
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 LECS used: 47.00918100000000E04FACB401.00E04FACB405.00 connected, vcd 84
LE BUS ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operational type: ethernet Max Frame Size: 1516
ATM address: 47.00918100000000E04FACB401.00E04FACB404.01 LE Client ATM13/0/0.1 ELAN name: eng_elan Admin: up State: initialState Client ID: unassigned Next join attempt in 36 seconds Join Attempt: 18 Last Fail Reason: Timeout on join request HW Address: 00e0.4fac.b402 Type: ethernet Max Frame Size: 1516 ATM Address: 47.00918100000000E04FACB401.00E04FACB402.01 VCD rxFrames txFrames Type ATM Address 0 0 0 configure 47.00918100000000E04FACB401.00E04FACB405.00 0 0 0 direct 47.00918100000000E04FACB401.00E04FACB405.00 0 0 0 distribute 00.000000000000000000000000.000000000000.00 0 0 0 send 00.000000000000000000000000.000000000000.00 0 0 0 forward 00.000000000000000000000000.000000000000.00 Switch#
Step 3 Check the Admin and State fields. They should read 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.
This section describes basic steps you can use to troubleshoot problems with the LANE client configuration that would cause the connections to fail.
Use the following command to test the LANE connection status and performance:
| Command | Task |
|---|---|
Show the connection status of the LAN emulation client. |
Use the following 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
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 83 seconds
Join Attempt: 11 Last Fail Reason: Timeout on join request HW Address: 00e0.4fac.b402 Type: ethernet Max Frame Size: 1516 ATM Address: 47.00918100000000E04FACB401.00E04FACB402.01 VCD rxFrames txFrames Type ATM Address 0 0 0 configure 47.00918100000000E04FACB401.00E04FACB405.00 87 1 2 direct 47.00918100000000E04FACB401.00E04FACB403.01 90 1 0 distribute 47.00918100000000E04FACB401.00E04FACB403.01 91 0 1 send 47.00918100000000E04FACB401.00E04FACB404.01 94 0 0 forward 47.00918100000000E04FACB401.00E04FACB404.01 EngFl1Ls1#
Step 2 Check the ELAN name field. This should match the ELAN name configured.
Step 3 Check the Admin and State fields. They should read up and operational respectively.
Step 4 Check the Join Attempts field.
Step 5 Check the ATM Addresses column in the virtual channel circuit (VCC) configuration table. These ATM Address 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 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. |
Use the following 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:
EngFl1Ls1# show lane database
LANE Config Server database table 'eng_dbase' bound to interface/s: ATM13/0/0 default elan: eng_elan elan 'eng_elan': un-restricted
server 47.00918100000000E04FACB401.00E04FACB403.01 (prio 0) EngFl1Ls1#
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 describes the debug commands used to troubleshoot the LANE setup and signalling processes.
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. |
Turns off all debugging. |
Posted: Fri Apr 9 10:27:15 PDT 1999
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