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NIC Names Change on the Windows 2008

Publication Date:  2015-06-25 Views:  153 Downloads:  0
Issue Description
Hardware configuration:
BH620 with a GE daughter card in slot Mezz2

Software configuration:
Windows 2008 R2

Symptom:

When the Windows 2008 R2 operating system (OS) is installed on the BH620, the network interface card (NIC) names are not arranged in a fixed sequence: bus ID 2:4:0/1 indicates an onboard NIC, and bus ID 6:4:0/1 indicates the GE daughter card in slot Mezz2. After the Windows 2008 R2 is installed for the first time, the NIC names are not arranged based on the bus ID. After all NICs are uninstalled and the OS is restarted, the NIC names change, as shown in Figure 1.

Figure 1 NIC names



 NOTE:
Figure 1 shows the NIC names before drivers are loaded. The NIC names do not change after drivers are loaded.
Handling Process
To ensure that the Windows 2008 OS assigns names to NICs based on the bus ID, perform the following operations:
  1. Open the Device Manager of the OS and uninstall the GE daughter card in slot Mezz2.
  2. Restart the OS. Then the OS automatically installs the driver for the GE daughter card in slot Mezz2. In this way, the name of the GE daughter card in slot Mezz2 is behind the name of the onboard NIC.
Root Cause
1.  NIC names are assigned by the OS. The Windows 2008 OS assigns names (for example, local connection 1 and local connection 2) to NICs based on the sequence in which the NICs get ready.

2.  The BH620 has four NICs. When the Windows 2008 OS is installed, drivers are installed for the four NICs. The OS assigns a name to the NIC that gets ready first. Which NIC gets ready first is uncertain, and therefore the NIC name is uncertain.

The Windows 2008 OS assigns names to NICs based on the sequence in which NICs get ready other than the bus ID.
Suggestions
When the BH620 is fully configured with two GE Mezz daughter cards, recommended mappings between NICs and NIC names are provided in Table 1.

Table 1 Mappings between NICs and NIC names 

END