Problems with the ATM Network
The problems in this phase occur after ATM traffic is started in the network between ATM devices
attached to media module ports. The ATM port status is
UP
.
Important: Problems in the normal operation of your ATM network may occur when the maximum
number of virtual connections (VCs) allowed on a switch or an individual media module is
exceeded. The maximum number of virtual connections supported (in a burst) is as follows:
6144 per switch
4064 per media module (with up to 4064 VCs per port).
In normal operation 95% of the above figures should be considered as the maximum.
You should also be aware of the following maximums:
128 reachable addresses per switch
127 point-to-multipoint connections per switch
512 PVCs per switch
512 ESIs per switch.
You should ensure that the ports and both ends of a connection are using the same VPI/VCI settings. See
“Setting Up Permanent Virtual Connections (PVCs)” on page 50 for valid settings.
If you cannot solve the problem after performing the troubleshooting operations described in this section,
contact your IBM service representative.
Checking ATM Address Registration
If you suspect that a problem is due to faulty ATM address registration between a switch and an attached
ATM device, follow these steps:
1. Enter the SHOW PORT command to make sure that the media port is configured with a UNI interface.
If not, enter the SET PORT command and specify
uni
for the interface parameter.
2. Check that the port status shows
UP
. ATM address registration can only occur when ILMI is up.
3. Make sure that the attached device supports the ATM network prefix used by the switch.
4. Make sure that the device supports ATM address registration. To check whether the device registered
its ATM address, use the command SHOW REACHABLE_ADDRESS (with the
DYNAMIC
parameter).
Make sure that the reachable address is also shown as active.
5. Make sure that the device is not using a protocol for ATM address registration that is incompatible with
the protocol used by the switch.
6. Contact your IBM service representative.
Appendix A. Troubleshooting
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