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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  x2-10gb-sr光模块

Products Affected
X2-10GB-SR

Problem Description  x2-10gb-sr光模块

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 thereloadcommand 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  x2-10gb-sr光模块

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 areloadcommand 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  x2-10gb-sr光模块

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 theshutdownandno shutdowncommands 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  x2-10gb-sr光模块

Workaround  x2-10gb-sr光模块

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

Solution  x2-10gb-sr光模块

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  x2-10gb-sr光模块

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 theshow inventoryoutput ?

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 x2-10gb-sr光模块isnotaffected because its serial number is outside the affected range:

This is an example of ashow inventoryoutput to identify the Serial Number of the X2-10GB-SR, which is inboldformat:

Switch#sh inv
NAME: "Switch System", DESCR: "Cisco Systems, Inc. WS-C4948-10GE 1 slot switch "
PID: , VID: , SN: x2-10gb-sr光模块

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
x2-10gb-sr光模块
NAME: "TenGigabitEthernet1/49", DESCR: "10Gbase-SR"
PID: FTLX8541E2-CS , VID: D , SN:FNS111510FR
x2-10gb-sr光模块
NAME: "TenGigabitEthernet1/50", DESCR: "10Gbase-SR"
PID: FTLX8541E2-CS , VID: D , SN:FNS11151103
x2-10gb-sr光模块
NAME: "Power Supply 1", DESCR: "Power Supply ( AC 300W )"
PID: PWR-C49-300AC , VID: , SN: PAC11010LF9