ATM Configuration and Troubleshooting Guide

Troubleshooting
Troubleshooting LAN Emulation
Chapter 9232
a. Check that both systems’ IP addresses and subnet masks belong to
the same IP subnet. If necessary, run SAM to reconfigure the IP
addresses and subnet masks. If, intentionally, both systems’ IP
addresses and subnet masks do not belong to the same IP subnet,
check that your router is configured correctly to route between the
two subnets.
b. Check that both the source and destination systems are operational
and registered with the correct LES/BUS pair—see “Checking That
Both LECs are in the Same ELAN” on page 236 for details.
c. In the case of a legacy LAN-connected end system, check that the end
system is operational and can communicate with the edge device and
is known to it—see the legacy LAN end system and edge device
troubleshooting documentation for details.
d. In the case of a legacy LAN-connected end system, check that the
edge device has successfully joined the same ELAN as the source end
system—see your edge device’s documentation.
D Check the LAN Emulation ARP table (LE_ARP table), by using this
command:
elarp -n net_interface
This shows if the destination system’s MAC address can be resolved into
an ATM address by the LES, and whether a Data Direct VC can be
opened from the source to the destination LEC.
If the MAC-to-ATM address mapping is not displayed, then do the
following:
Step 1. Check that both end systems are operational and registered with the
same LES—see “Checking That Both LECs are in the Same ELAN” on
page 236 for details.
Step 2. In the case of a legacy LAN-connected end system, check that the end
system is operational and can communicate with the edge device and is
known to it—see the legacy LAN end system and edge device
troubleshooting documentation for details.
Step 3. In the case of a legacy LAN-connected end system, check that the edge
device has successfully joined the same ELAN as the source end
system—see your edge device’s documentation.