IBM OPTIONS ATM OC-3c, User Manual

Page: 117 / 140

Solving Known Problems D-23
If you have problems that are not addressed by
troubleshooting information in this guide, contact
Technical Support, or your service person. For
Technical Support information refer to Appendix E.
Intermittent failure of a
configured LEC to connect to
the LECS or LES
Symptom:
■
Insufficient resource error
message.
■
LECs fail but seem to
automatically recover.
■
The MAX VPI Bits and MAX VCI Bits
settings are incompatible between ATM
devices. For example, if auto-
configuration is not enabled, and the
MAX VPI/VCI Bits have been set up
incorrectly.
■
Each ATM device supports a separate
and sometimes different pre-set range
of VPI/VCI values. When Signalling tries
to set up the VPI/VCI values for a
connection, it automatically suggests the
next available value in a pre-set range of
values supported by the source Switch.
If the adjacent ATM Switch does not
support these values, it rejects the
connection, and an insufficient resource
error message is displayed.
Example :
If Switch A supports VPI/VCI values 7:511
and Switch B only supports values up to
7:255, when Signalling tries to set up a
connection using the VPI/VCI value 7:256,
Switch B rejects the connection.
Identify the connection that is causing the problem. The
following steps should be carried out in order:
1 Check that the MAX VPI/VCI Bits are compatible on
the edge-device to ATM Switch User-to-Network
interface (UNI).
2 Check that the MAX VPI/VCI Bit settings are
compatible on all devices between the edge-device
and the LECS.
3 Check that the MAX VPI/VCI Bit settings are
compatible on all ATM devices between the LEC and
the LES.
When you have identified the connection, manually
reconfigure the VPI/VCI values to make them
compatible.
Table D-9 VLAN or ELAN Problems