IBM ATM OC-3c manual Example

Solving Known Problems D-23

Table D-9VLAN or ELAN Problems

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:

1Check that the MAX VPI/VCI Bits are compatible on the edge-device to ATM Switch User-to-Network interface (UNI).

2Check that the MAX VPI/VCI Bit settings are compatible on all devices between the edge-device and the LECS.

3Check 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.

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.