Posts about bonding

bonding bridging network redhat vlan

Configuring bridging, bonding, vlans on CentOS/RedHat 6.x

/etc/sysconfig/network-scripts/ifcfg-em1 and em2

DEVICE=<device-name>
ONBOOT=yes
HWADDR=XX:XX:XX:XX:XX:XX

/etc/sysconfig/network-scripts/ifcfg-em1.vlanid (example ifcfg-em1.20)

DEVICE=<device>.<vlanid>
ONBOOT=yes
VLAN=yes
BOOTPROTO=none
SLAVE=yes
MASTER=bond

/etc/sysconfig/network-scripts/ifcfg-bond (example ifcfg-bond20)

DEVICE=bond<vlanid>
ONBOOT=yes
BONDING_OPTS="mode=active-backup primary=em1 miimon=100"
BOOTPROTO=none
BRIDGE=br<vlanid>
MACADDR=<RANDOM_MAC>

/etc/sysconfig/network-scripts/ifcfg-br (example ifcfg.br20)

DEVICE=br<vlanid>
ONBOOT=yes
TYPE=Bridge
DELAY=0
BOOTPROTO=static
IPADDR=X.X.X.X
NETMASK=X.X.X.X

So, creating 3 vlans (20, 200, 250) on a 2 interface bond (em1, em2) creates the following set of configfiles:

ifcfg-em1: Base configuration for em1
ifcfg-em2: Base configuration for em2
ifcfg-em1.20: Vlan 20 interface on em1 interface
ifcfg-em1.200: Vlan 200 interface on em1 interface
ifcfg-em1.250: Vlan 250 interface on em1 interface
ifcfg-em2.20: Vlan 20 interface on em2 interface
ifcfg-em2.200: Vlan 200 interface on em2 interface
ifcfg-em2.250: Vlan 250 interface on em2 interface
ifcfg-bond20: Bonding em1.20 with em2.20
ifcfg-bond200: Bonding em1.200 with em2.200
ifcfg-bond250: Bonding em1.250 with em2.250
ifcfg-br20: Create a bridge on bond20
ifcfg-br200: Create a bridge on bond200
ifcfg-br250: Create a bridge on bond250