This section uses SUSE Linux Enterprise Server 11 SP4 as an example to describe how to configure a user-defined VLAN for BMSs.

Use a key or password to log in to the BMS as user root.

On the BMS CLI, run the following command to check the NIC information:

ip link

Information similar to the following is displayed:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 8888 qdisc mq master bond0 state UP qlen 1000
    link/ether fa:16:3e:0d:13:7c brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 8888 qdisc mq master bond0 state UP qlen 1000
    link/ether fa:16:3e:0d:13:7c brd ff:ff:ff:ff:ff:ff
4: eth4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 40:7d:0f:f4:ff:5c brd ff:ff:ff:ff:ff:ff
5: eth5: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 40:7d:0f:f4:ff:5d brd ff:ff:ff:ff:ff:ff
6: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 8888 qdisc noqueue state UP 
    link/ether fa:16:3e:0d:13:7c brd ff:ff:ff:ff:ff:ff

Among the devices, eth0 and eth1 bear the VPC, and eth4 and eth5 bear the user-defined VLAN.

Run the following command to check whether the /etc/udev/rules.d/ directory contains the 80-persistent-net.rules file:
ll /etc/udev/rules.d/ | grep 80-persistent-net.rules
- If yes, and the file contains all NICs except bond0 and lo obtained in step 2 and their MAC addresses, go to step 6.
- If no, go to step 4.
Run the following command to copy the /etc/udev/rules.d/70-persistent-net.rules file and name the copy as /etc/udev/rules.d/80-persistent-net.rules.
cp -p /etc/udev/rules.d/70-persistent-net.rules /etc/udev/rules.d/80-persistent-net.rules
Configure the udev rules:
Add the NICs and their MAC addresses obtained in step 2, except lo, eth0, eth1, and bond0, to the /etc/udev/rules.d/80-persistent-net.rules file. This ensures that the names and sequence of NICs will not change after the BMS is restarted.

Ensure that NIC MAC addresses and names are lowercase letters.

vim /etc/udev/rules.d/80-persistent-net.rules

The modification result is as follows:
```
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="e8:4d:d0:c8:99:67", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="e8:4d:d0:c8:99:68", NAME="eth1"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="40:7d:0f:f4:ff:5c", NAME="eth4"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="40:7d:0f:f4:ff:5d", NAME="eth5"
```
After the modification, press Esc, enter :wq, save the configuration, and exit.
Run the following commands to copy the network configuration file /etc/sysconfig/network/ifcfg-bond0 to generate the /etc/sysconfig/network/ifcfg-bond1 file, and copy the /etc/sysconfig/network/ifcfg-eth0 file to generate the /etc/sysconfig/network/ifcfg-eth4 and /etc/sysconfig/network/ifcfg-eth5 files:
cp -p /etc/sysconfig/network/ifcfg-bond0 /etc/sysconfig/network/ifcfg-bond1

cp -p /etc/sysconfig/network/ifcfg-eth0 /etc/sysconfig/network/ifcfg-eth4

cp -p /etc/sysconfig/network/ifcfg-eth0 /etc/sysconfig/network/ifcfg-eth5
Run the following commands to edit the /etc/sysconfig/network/ifcfg-eth4 and /etc/sysconfig/network/ifcfg-eth5 files:
- vim /etc/sysconfig/network/ifcfg-eth4
  Edit the eth4 network configuration file as follows:
```
STARTMODE=auto
MTU=8888
NM_CONTROLLED=no
BOOTPROTO=static
DEVICE=eth4
USERCONTRL=no
LLADDR=40:7d:0f:f4:ff:5c
TYPE=Ethernet
```
  Change the value of BOOTPROTO to static, that of DEVICE to eth4, and that of LLADDR to the MAC address of eth4, which you can obtain in step 2. Retain values of other parameters.
- vim /etc/sysconfig/network/ifcfg-eth5
  Edit the eth5 network configuration file as follows (similar to eth4):
```
STARTMODE=auto
MTU=8888
NM_CONTROLLED=no
BOOTPROTO=static
DEVICE=eth5
USERCONTRL=no
LLADDR=40:7d:0f:f4:ff:5d
TYPE=Ethernet
```
Run the following command to edit the /etc/sysconfig/network/ifcfg-bond1 file:
vim /etc/sysconfig/network/ifcfg-bond1

Edit the file as follows:
```
BONDING_MASTER=yes
TYPE=Bond
STARTMODE=auto
BONDING_MODULE_OPTS="mode=1 miimon=100"
NM_CONTROLLED=no
BOOTPROTO=static
DEVICE=bond1
USERCONTRL=no
LLADDR=40:7d:0f:f4:ff:5c
BONDING_SLAVE1=eth4
BONDING_SLAVE0=eth5
IPADDR=10.10.10.4
NETMASK=255.255.255.0
MTU=8888
```
Where,
- Change the value of BOOTPROTO to static.
- Change the value of DEVICE to bond1.
- Change the value of LLADDR to the MAC address of a network device in step 7, for example, 40:7d:0f:f4:ff:5c.
- Change the values of BONDING_SLAVE1 and BONDING_SLAVE0 to the device names in step 7, that is, eth4 and eth5.
- Change the value of IPADDR to the IP address to be allocated to bond1. If the IP address planned for the user-defined VLAN does not conflict with the VPC network segment, you can plan the IP address as needed, only to ensure that BMSs communicating through the user-defined VLAN are in the same network segment as the user-defined VLAN. An example value is 10.10.10.4.
- Set the value of NETMASK to the subnet mask of the IP address allocated to bond1.
- Change the value of MTU to 8888.
Retain values of other parameters.

After the modification, press Esc, enter :wq, save the configuration, and exit.
Run the following commands to restart the network:
ifup eth4

ifup eth5

ifup bond1

eth4 and eth5 are the network ports bear the user-defined VLAN and bond1 is the port group of the user-defined VLAN.
Run the following commands to check the NIC device status and whether the bond1 configuration file takes effect:
ip link

ifconfig
Perform the preceding operations to configure other BMSs.
After all BMSs are configured, ping the IP addresses of other BMSs from each BMS.

Configuring a User-defined VLAN (SUSE Linux Enterprise Server 11)