Data Domain: Invalid network configuration setting error caused by qlogic cards

Summary: A TX timeout triggered the QLogic auto-recovery mechanism, which reset the interface from the configured MTU of 9000 to the default MTU of 1500; if the issue reoccurs, we can either manually restore the MTU or keep the interface configured with the default value. ...

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Symptoms

Alerts will show: 

p0-4299   Thu Mar 12 06:47:09 2026   WARNING    Network   Interface Index=11:Setting=MTU   EVT-NETM-00003: Invalid network configuration setting on eth3c.
p0-4300   Thu Mar 12 06:47:10 2026   WARNING    Network   Interface Index=12:Setting=MTU   EVT-NETM-00003: Invalid network configuration setting on eth3d.


In kernal.info you will see:  

Mar 12 06:47:03 xxxxxxxxxxxx kernel: [11647878.578944] (E4)[qede_tx_timeout:1023(eth3a)]Tx timeout!


Net show config output before alert and after 

Before 

eth3c     Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:x.x.x.x  Bcast:10.149.219.255  Mask:255.255.252.0
          inet6 addr: fe80::3680:dff:fec8:2302/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:8265118 errors:0 dropped:391043 overruns:0 frame:0
          TX packets:6061371 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:11286254464 (10.5 GiB)  TX bytes:7765370042 (7.2 GiB)
          Interrupt:66 Memory:9f820000-9f83ffff

      
After 

eth3c     Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:x.x.x.x  Bcast:10.149.219.255  Mask:255.255.252.0
          inet6 addr: fe80::3680:dff:fec8:2302/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8265118 errors:0 dropped:391043 overruns:0 frame:0
          TX packets:6061371 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:11286254464 (10.5 GiB)  TX bytes:7765370042 (7.2 GiB)
          Interrupt:66 Memory:9f820000-9f83ffff

Cause

The issue is caused by a TX timeout. Although there is an auto-recovery mechanism for QLogic TX timeouts, the recovery process resets the network interface to its default configuration.
In this case, the data domain had been configured with an MTU of 9000, but when the auto-recovery was triggered, the interface settings were reverted to the default MTU value of 1500.

Resolution

If the issue reoccurs, we can manually reset the MTU to the desired value. 

net config ethXx mtu 1500 

Or 

net config ethXx mtu 9000


Alternatively, we can leave these interfaces configured with the default MTU of 1500 to avoid the MTU being changed during the recovery process.

Affected Products

Data Domain
Article Properties
Article Number: 000486034
Article Type: Solution
Last Modified: 07 يوليو 2026
Version:  1
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