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. ...
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.