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Cisco Catalyst 4900 Series Switches

Field Notice: FN - 63128 - Laser of X2-10GB-SR May Remain Off on ME-4924-10GE, WS-C4928-10GE and WS-C4948-10GE After Reload - Replace X2-10GB-SR

Field Notice: FN - 63128 - Laser of X2-10GB-SR May Remain Off on ME-4924-10GE and WS-C4948-10GE After Reload - Replace X2-10GB-SR

Revised May 12, 2009
June 12, 2008


NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision Date Comment
1.3
12-MAR-2009
Removed upgrade program.
1.2
09-MAR-2008
Updated with another product WS-C4928-10GE.
1.1
03-JUL-2008
Revised steps in the How to Identify Hardware Levels section.
1.0
12-JUN-2008
Initial Public Release

Products Affected

Products Affected
X2-10GB-SR

Problem Description

On ME-4924-10GE, WS-C4928-10GE and WS-C4948-10GE switches, the laser transmitter of a subset of X2-10GB-SR modules can remain off after a software crash or when the reload command is invoked. This is due to a firmware bug in the X2 modules. This problem is exposed only on three switches, the ME-4924-10GE, WS-C4928-10GE and the WS-C4948-10GE.

This problem does not occur on any other platforms or switches.

Background

The affected X2 modules are from one particular vendor. The root cause of the problem is a minor firmware bug in the affected X2 modules that activates the module's laser eye safety mechanism. This safety mechanism shuts off the transmitter laser if the module's reset pin is held high for more than five seconds. ME-4924-10GEs, WS-C4928-10GE and WS-C4948-10GEs hold the X2 modules in reset more than five seconds when a reload command is invoked or after the switch recovers from a software crash. This problem does not occur when the aforementioned switches are power-cycled.

Problem Symptoms

After a software crash or when the reload command is invoked on the identified switches, the transmitter of the affected X2 modules remains off and does not turn back on, which causes the link to stay down. If you issue the shutdown and no shutdown commands on the port, it does not bring the link back up. The link does not come up without manual intervention as described in the Workaround/Solution section.

After the switch comes back online, messages similar to this appear on the console:

*May 5 09:06:15.267 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/49, changed state to down
*May 5 09:06:15.267 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/50, changed state to down

Workaround/Solution

Workaround

The affected X2 modules recover after the module is removed and re-inserted or when the switch is power cycled.

Solution

The permanent solution for this problem is to replace the affected X2 modules used on ME-4924-10GE, WS-C4928-10GE and WS-C4948-10GE switches.

Although an upgrade program was previously provided to replace potentially affected but otherwise working products, the upgrade program is now over, and Cisco only replaces products that actually fail. The standard RMA process must be used in order to replace failed product.

How To Identify Hardware Levels

This problem is seen only with modules deployed in ME-4924-10GE, WS-C4928-10GE and WS-C4948-10GE switches.

  1. Is the module's serial number between FNS1042xxxx to FNS1138xxxx inclusive? If not, the module is not affected. If yes, continue to step 2.
  2. If you have physical access to the module, is the module's Cisco Part Number 10-2205-02 ?
    Or
    If you do not have physical access to the module, is the Vendor Part Number "FTLX8541E2-CS" and Vendor Revision letter "D" according to the show inventory output ?

If you answered "yes" in steps 1 and 2, the module is affected and must be replaced.

This is a picture of a X2-10GB-SR that is not affected because its serial number is outside the affected range:

This is an example of a show inventory output to identify the Serial Number of the X2-10GB-SR, which is in bold format:

Switch#sh inv
NAME: "Switch System", DESCR: "Cisco Systems, Inc. WS-C4948-10GE 1 slot switch "
PID: , VID: , SN:

NAME: "Linecard(slot 1)", DESCR: "10/100/1000BaseT (RJ45), 10GE (X2) Supervisor with 48 10/100/1000BaseT ports an"
PID: WS-C4948-10GE , VID: V06, SN: FOX10480BWL

NAME: "TenGigabitEthernet1/49", DESCR: "10Gbase-SR"
PID: FTLX8541E2-CS , VID: D , SN: FNS111510FR

NAME: "TenGigabitEthernet1/50", DESCR: "10Gbase-SR"
PID: FTLX8541E2-CS , VID: D , SN: FNS11151103

NAME: "Power Supply 1", DESCR: "Power Supply ( AC 300W )"
PID: PWR-C49-300AC , VID: , SN: PAC11010LF9

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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