Table D-4Last LEC Failure Reason (continued)

State

Possible Causes

Possible Solutions

Duplicated ATM

The LES has received a

Ensure that ATM

Address

request from a LEC

addresses are unique.

 

which contains an ATM

Check the LES

A source ATM

address already

database for duplicate

address duplicates a

registered to another

addresses.

previously

LEC on the same ELAN.

 

registered ATM

 

 

address.

For example, if a LES is

 

 

faulty, when a LEC

 

 

disconnects from the

 

 

LES, the LES might fail

 

 

to register the change.

 

 

When the LEC tries to

 

 

rejoin the LES, the LES

 

 

still has that LEC’s ATM

 

 

address in its database,

 

 

and thinks that two

 

 

devices have the same

 

 

ATM address.

 

 

You may have

 

 

accidentally entered

 

 

the same ATM

 

 

addresses twice.

 

(continued)

 

 

 

Identifying the Problem

D-13

Table D-4Last LEC Failure Reason (continued)

 

 

State

Possible Causes

Possible Solutions

Insufficient

Too many connections

You may wish to

 

Resources

have been requested

consider extending or

 

and the tables used by

restructuring your

There are

the LES may be full,

network.

 

insufficient

and the connection

 

 

resources to grant a

cannot be set up.

 

 

request.

 

Use a separate ATM

 

The ATM Switch is busy

 

and cannot provide

Switch for LECS

 

 

LECS functionality.

functionality.

 

 

There is a mismatch

Make the MAX VPI/VCI

 

between the VPI/VCI

Bits compatible.

 

 

range supported by

 

 

 

adjacent ATM devices.

 

 

 

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.

 

 

Access Denied

The LEC is trying to join

Check your LANE

 

 

an ELAN that it is not

Services setup.

 

The LES has denied

allowed to access.

 

 

the LEC access to

 

 

 

the ELAN for security reasons.

(continued)

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Image 107
IBM ATM OC-3c manual LEC is trying to join