Siemens OSM Betriebsanweisung PDF herunterladen (Seite 173)

Logical

A unique number used to distinguish between plug-in cards on an MSEB

CRU.

Connector Number

Actions

Clear Loopback Test

Clears the loopback test on a plug-in card (PIC). This action clears both the internal loopback test

initiated by the Internal Loopback Test action and the external loopback initiated by the guided

procedure for troubleshooting a ServerNet fabric. The action enables ServerNet ports so that

packets can be routed to the PIC from adjacent ports on the MSEB or IOMF2 and from the PIC in

another enclosure connected by the ServerNet cable to the PIC being tested. Use this action if the

$ZCMOM process terminates while a loopback test is being performed. This action is safe to use

on any PIC even if you are not sure a loopback test needs to be cleared on the PIC.

Enable/Disable Port

Enables or disables the port for this CRU.

Parameter: Enabled (true = enabled, false = disabled)

NOTE: If the port being enabled or disabled is on an NNA-type (MSEB) PIC connected to an

External Servernet Switch, you must issue a Reset on the Primary SP in Group 1.

External Loopback Test

The external loopback test checks the circuitry of a plug-in card (PIC) to determine if ServerNet

traffic can pass through the PIC. You can use this test on a PIC installed in any port of an MSEB

or IOMF2 CRU. This test requires you to remove the ServerNet cable attached to the PIC and install

a loopback plug.

The external loopback test indicates whether or not the PIC circuitry is operational or faulty. Unlike

the internal loopback test, the external loopback test also checks the connector on the PIC.

CAUTION: Do not use the external loopback test on a PIC that you believe is operating normally.

Doing so shuts down ServerNet traffic through the PIC for the duration of the test (several minutes).

The action isolates the MSEB port occupied by the PIC, preventing the port from sending or receiving

ServerNet traffic. ServerNet traffic resumes when the test is finished.

Do not use the external loopback test if alarms are present on the peer fabric (the fabric opposite

the PIC you intend to test). If you do so, you might lose access to both fabrics, thereby isolating

the enclosure from the rest of the system. Multiple enclosures can be lost in this manner.

When to Use the External Loopback Test

Typically, you use the external loopback test to isolate the cause of a malfunctioning ServerNet

link where a PIC is part of that path. Use this test if you have run the internal loopback test on a

PIC, and the test passed, but you believe the PIC might still be bad. If both PICs of a ServerNet

link pass the external test, but the link is not usable, probably the ServerNet cable is faulty.

Internal Loopback Test

Tests the circuitry of a plug-in card (PIC) installed in an MSEB to determine if ServerNet traffic can

pass through the PIC.

CAUTION: Do not perform this test on a PIC that is operating normally because it will shut down

ServerNet traffic through the PIC. Also, do not perform this test on an NNA-type ServerNet PIC

because the test will fail even if nothing is wrong with the NNA PIC.

PIC 173

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