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Configuring LNM Services

1-12

303534-A Rev 00

• Receiver-Congestion Error Reporting Function

• Status Request Function

• Set Parameters Function

Soft-Error Reporting Function

REM performs error detection and isolation by analyzing soft-error MAC frames

that are periodically sent by ring stations experiencing errors. These MAC frames

are sent to the functional address assigned to REM. REM analyzes the soft-error

frames as they arrive and determines whether soft errors are occurring at a rate

that potentially or currently degrades the performance of the ring. When REM

detects such a condition, it notifies the IBM LAN Network Manager and, when

possible, provides data indicating the probable source of the error.

The error counters included in a soft-error MAC frame sent by a station are

divided into two types: isolating and nonisolating, which correspond to the type of

error being reported. The source of an isolating error can be isolated to a fault

domain; the source of a nonisolating error cannot be isolated to a domain smaller

than the ring.

Nonisolating Soft-Error Processing Function

Nonisolating errors can be isolated only to the ring on which they occur. A

counter is kept for each type of nonisolating error that is reported to REM in

soft-error MAC frames. Some internal error counters are also treated as

nonisolating errors. If one of these counters exceeds a threshold value, a

notification is sent (through LRM) to the IBM LAN Network Manager

application, and the REM soft-error counter is reset. No other analysis is

performed by REM for nonisolating errors.

Isolating Soft-Error Processing Function

When REM receives a soft-error MAC frame, the accumulated isolating error

count is interpreted as a weight. The weight associated with a particular station

indicates the likelihood that station is causing excessive soft errors on the local

ring. REM stores information about stations having nonzero weights in a table.

REM watches for an excessive-soft-error threshold in the table. Exceeding the

threshold indicates that

• A problem exists on the local ring

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