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6–Configuring NIC Functionality in the Converged Network Adapter
Configuring the NIC in a Linux Environment
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2. Enter the ifconfig command, and then examine the output. For example:
# ifconfig eth0.5
This command shows the eth0.5 VLAN interface status, statistics, and IP
address.
Disabling a VLAN interface
To disable a VLAN interface, enter the following command:
# ifconfig <ethX.VLAN ID or bondX.VLAN ID> down
In this command, <ethX.VLAN ID or bondX.VLAN ID> is the VLAN interface
name. For example:
# ifconfig eth0.5 down
To remove the VLAN interface, issue the following command:
# vconfig rem <ethX.VLAN ID or bondX.VLAN ID> down
In this command: <ethX.VLAN ID or bondX.VLAN ID> is the VLAN interface
name. For example:
# vconfig rem eth0.5
If the VLAN interface was created with an entry in the network configuration file,
delete that entry from the file
/etc/sysconfig/networking-scripts/ifcfg.
Creating a VLAN on a Bond Interface
You can configure VLAN devices over a bond interface using the 8021q driver.
However, only packets coming from the 8021q driver and passing through
bonding are tagged by default.
VLAN interfaces can be added on top of a bonding interface only after enslaving
at least one slave. The bonding interface has a hardware address of
00:00:00:00:00:00 until the first slave is added. If the VLAN interface is created
prior to the first enslavement, it picks up the all-zeros hardware address. After the
first slave is attached to the bond, the bond device picks up the slave's hardware
address, which is then available to the VLAN device.
A similar situation can arise if all slaves are released from a bond that still has one
or more VLAN interfaces on top of it. When a new slave is added, the bonding
interface obtains its hardware address from the first slave, which may not match
the hardware address of the VLAN interfaces that were copied from an earlier
slave.
To insure that the VLAN device operates with the correct hardware address when
all slaves are removed from a bond interface, remove, and then recreate all VLAN
interfaces.