RHEL VLAN and Bonding Configuration

Check list:

Check whether the 8021q module has been loaded.

lsmod | grep 8021q

If the 8021q module is not loaded, run the following command to load it: modprobe 8021q

Configuration

Add the following lines to /etc/modprobe.conf :

alias bond0 bondingoptions bonding max_bonds=1Edit /etc/sysconfig/network-scripts/ifcfg-eth0 it should look something like this:DEVICE=eth0USERCTL=noONBOOT=yesMASTER=bond0SLAVE=yesBOOTPROTO=noneHWADDR=Edit /etc/sysconfig/network-scripts/ifcfg-eth1 it should look something like this:DEVICE=eth1USERCTL=noONBOOT=yesMASTER=bond0SLAVE=yesBOOTPROTO=noneHWADDR=

Now create the Bond0 interface:

NOTE: No IP address will be assigned to the bond0 device.

Create a new file /etc/sysconfig/network-scripts/ifcfg-bond0 it should look like this:

DEVICE=bond0BOOTPROTO=noneONBOOT=yesTYPE=EthernetBONDING_OPTS="mode=1 miimon=100"

NOTE: mode could be different, these are the mode options, but if Blade server is using Virtual Connect user should use mode=1.

mode=0 (balance-rr) Round-robinmode=1 (active-backup) Active-backupmode=2 (balance-xor) XORmode=3 (broadcast) Broadcastmode=4 (802.3ad) IEEE 802.3ad Dynamic link aggregationmode=5 (balance-tlb) Adaptive transmit load balancingmode=6 (balance-alb) Adaptive load balancing

The first four modes are the most commonly used:

VLAN tag setup

This will be a virtual interface with a VLAN tag of 48. User's VLAN set-up is most likely different so just replace 48 with the VLAN tag of user's network. i.e. bond1.50 would be the bonded interface for VLAN 50.

Create a new file /etc/sysconfig/network-scripts/ifcfg-bond0.48 it should look like this:

DEVICE=bond0.48ONBOOT=yesTYPE=EthernetBOOTPROTO=staticVLAN=yesNETMASK=255.255.255.0NETWORK=192.168.48.0IPADDR=192.168.48.100

Ensure that the default gateway in this configuration is recorded in the /etc/sysconfig/network file otherwise it may not work properly. Once done, it should look something like:

NETWORKING=yesHOSTNAME=GATEWAY=192.168.48.1

User has now setup bonding and VLAN tagging. User needs to restart networking to make the changes active.

service network restart

Testing

Verify bonding interface is up and running

ifconfig -a

Verify configuration (RHEL 5 is using sysfs , so check out /sys/class/net/ )