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RH1285 5709C NICs Automatically Delete L2 VLAN Tags

Publication Date:  2015-06-25 Views:  186 Downloads:  0
Issue Description
Hardware configuration:
The RH1285 is configured with Windows 2008.
Network interface cards (NICs) are on-board 5709Cs.


During RH1285 test, L2 virtual local area network (VLAN) data in QinQ mode is transmitted to server NICs, and the VLAN information at the outside layer is automatically deleted.
Handling Process
You can perform the following operations to manually modify parameters to force NICs not to process received network packets.

1.  Find the NIC device in the Device Manager window, and select Broadcom BCM5709C NetXtreme II GigE.

2.  Right-click the NIC and choose Properties from the shortcut menu, and record Value of Driver key.

3.  Enter regedit in Run, and run the command to display the Registry Editor window. Then add keep_vlan_tag to \HKLM\SYSTEM\CurrentControlSet\Control\Class\{Driver Key}, and set keep_vlan_tag to 1.

Driver Key is the value recorded in step 2.

4.  Restart the NIC to make the settings take effect.

5.  Perform the same settings on NIC 2.
Root Cause
The default configuration for the Broadcom5709C driver is as follows: VLAN tags of the received packet are automatically deleted. Therefore, L2 VLAN information is deleted.

Generally, do not modify driver parameters, and adopt the default configuration. Reserve L2 VLAN tags when required.

The symptom is the same as the default driver configuration, and has no impact on services. NIC drivers of many manufacturers, such as intel and broadcom automatically, delete L2 VLAN tags by default.