Configure VLAN Based on Ethernet Adapter

The following example set the xCAT properties for compute node cn1 to create:

  • Compute node cn1 has one physical NIC: eth0
  • Configure 2 vlans: eth0.6 and eth0.7 based on eth0
  • Assign ip to eth0.6 and to eth0.7

Define the additional networks to xCAT

Add/modify the networks net60 and net70 in the networks table

chdef -t network net60 net= mask=
chdef -t network net70 net= mask=

Define attributes in the nics table

  1. Compute node cn1 has one physical NIC: eth0

    chdef cn1 nictypes.eth0=ethernet
  2. Define vlan eth0.6 and eth0.7 based on eth0

    chdef cn1 nictypes.eth0.6=vlan nicdevices.eth0.6="eth0" nictypes.eth0.7=vlan nicdevices.eth0.7="eth0"
    chdef cn1 nicips.eth0.6= nicips.eth0.7=
  3. Define nicnetworks for eth0.6 and eth0.7

    chdef cn1 nicnetworks.eth0.6=net60 nicnetworks.eth0.7=net70
  4. Define nichostnamesuffixes for eth0.6 and eth0.7 in case makehosts to update /etc/hosts, since the value for nichostnamesuffixes cannot contain “.”, other characters are recommended instead of “.”, like following:

    chdef cn1 nichostnamesuffixes.eth0.6=-eth0-6 nichostnamesuffixes.eth0.7=-eth0-7

Enable confignetwork to configure VLAN

  1. Add confignetwork into postscript list to execute on reboot

    chdef cn1 -p postscripts=confignetwork
  2. If the compute node is already running, use updatenode command to run confignetwork postscript without rebooting the node

    updatenode cn1 -P confignetwork

Verify VLAN

Login to compute node cn1 and check VLAN options in ifcfg-eth0.6 and ifcfg-eth0.7 under /etc/sysconfig/network-scripts/


Use ip addr command to check if eth0.6 and eth0.7 are there.