Field Notice: FN74335 - Cisco ASR 9000 Series 5th Generation 400 Gigabit Ethernet Enhanced Multi-Rate Line Cards with device_revision 2 Requires Cisco IOS XR Software Release 25.2.2 and Later to Function Properly - Software Upgrade Recommended

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Updated:March 4, 2026

Document ID:FN74335

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High

Impact Rating:

High

First Published:

2026-Mar-04

Last Published:

2026-Mar-04

Revision:

1.0

Cisco Bug IDs:

CSCwo95441

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.

Products Affected

Affected Product Name	Description	Comments
A99-4HG-FLEX-X-FC	ASR 9900 400GE Flexible Consumption LC Enhanced - 5th Gen
A99-4HG-FLEX-X-SE	ASR 9900 400GE Service Edge Line Card Enhanced - 5th Gen
A9K-4HG-FLEX-X-FC	ASR 9000 400GE Flexible Consumption LC Enhanced - 5th Gen
A9K-4HG-FLEX-X-SE	ASR 9000 400GE Service Edge Line Card Enhanced - 5th Gen

Affected Software Product	Affected Release	Affected Release Number	Comments
IOS XR Software	25	25.1.1, 25.2.1

Defect Information

Defect ID	Headline
CSCwo95441	ASR9K Moonracer: 4HG-FLEX-X Rev C Support

Problem Description

Cisco ASR 9000 Series 5th Generation 400 Gigabit Ethernet Enhanced Multi-Rate line cards with device_revision 2 requires Cisco IOS XR Software Release 25.2.2 or later to function properly.

Background

The latest line cards are manufactured with a new, qualified component by Cisco Engineering during the manufacturing process.

Line cards with device_revision 2 with the new component require Cisco IOS XR Software Release 25.2.2 or later.
Line cards with device_revision 0 with the old component can run on Cisco IOS XR Software Release 25.1.1 or later.

Note: There are no feature or functionality differences between line cards that are manufactured with new and old components.

Problem Symptom

When line cards with device_revision 2 are installed and powered ON in a chassis that is running Cisco IOS XR Software Release 25.1.1 or Release 25.2.1, line card interfaces will not initialize, and the following syslogs are observed:

LC/0/5/CPU0: lda_server[119]: QSPI reset of MDX2 Device 0 as it failed to init
LC/0/5/CPU0: lda_server[117]: %PLATFORM-LDA-3-INIT_FAIL : Failed to initialize Linecard device (0xa8449200 - 'FPGALIB' detected the 'fatal' condition 'Code(9)')  : lda_server : (PID=4272) :  -Traceback= 7f564e8d90eb 7f564e89f22a 7f564e89ee80 55aef8bcafaa 7f564e52f57b 7f564e52f404 55aef8bcab66 7f564e141d63 55aef8bc8f7a

LC/0/5/CPU0: processmgr[51]: %OS-SYSMGR-3-ERROR : lda_server(1) (jid 117) exited, will be respawned with a delay (slow-restart)
LC/0/5/CPU0: processmgr[51]: %OS-SYSMGR-3-ERROR : lda_server(117) (fail count 1) will be respawned in 10 seconds

Workaround/Solution

Solution

Cisco recommends that all customers with ASR 9000 routers using the line cards that are identified in the Products Affected section upgrade to Cisco IOS XR Software Release 25.2.2 or later to ensure continued and proper device functionality.

How to Identify Affected Products

To verify the device_revision of the line card, log on to the bash prompt of the line card and run the following CLI command:

run ssh lcX_xr    -------> (X - slot number)
 lda_debug client mdx1 get_device_info 0

The following output was collected from an ASR 9000 chassis with an affected line card that contains the old component and is running Cisco IOS XR Software Release 25.1.1:

 RP/0/RSP0/CPU0:ios#run ssh lc1_xr
[xr-vm_node0_1_CPU0:~]$lda_debug client mdx1 get_device_info 0 
mdx2_status_info_t: 
    build_code: 0
    sw_revision: 2875935841 
    sw_version: 0x308000 
    device_connected: 1 
    sw_fw_mismatch: 0 
    device_info: 
        device_type: 0x6218 <
      device_revision: 0             <------- indicates old component
        device_temperature: 44 
        device_info_8: 1742597474 
        device_info_9: 8388711 
        fw_alive: 1 
        fw_up_time: 169215 
        fw_is_configured: 1 
        fw_revision: 2875935841 
        fw_version: 0x308000 
    device_variant: MDX2_DEVICE_MDX2P 
Successfully get MDX2 device info. Device Id 0 
[xr-vm_node0_1_CPU0:~]$

Note: The lda_debug CLI command will NOT work for line cards with device_revision 2 on Cisco IOS XR Software Release 25.1.1. Refer to the output shown in the Problem Symptom section.

Revision History

Version	Description	Section	Date
1.0	Initial Release	—	2026-MAR-04

For More Information

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