Configure Bridge Based on VLAN

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

  • Compute node cn1 has one physical NIC: eth0

  • Define 2 vlans: eth0.6 and eth0.7 based on eth0

  • Define 2 bridge br1 and br2

  • Assign ip 60.5.106.9 to br1 and 70.5.106.9 to br2

Define attributes in the nics table

  1. Using the mkdef or chdef commands

    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"

    3. Define bridge br1 and br2

      chdef cn1 nicips.br1=60.5.106.9 nicips.br2=70.5.106.9 nictypes.br1=bridge nictypes.br2=bridge

Add network object into the networks table

Use the chdef command to add/modify the networks in the networks table

chdef -t network net60 net=60.0.0.0 mask=255.0.0.0
chdef -t network net70 net=70.0.0.0 mask=255.0.0.0
chdef cn1 nicnetworks.br1=net60 nicnetworks.br2=net70

Add confignetwork into the node’s postscripts list

Use command below to add confignetwork into the node’s postscripts list

chdef cn1 -p postscripts=confignetwork

During OS deployment on compute node, confignetwork postscript will be executed. If the compute node is already running, use updatenode command to run confignetwork postscript without rebooting the node:

updatenode cn1 -P confignetwork

Verify Bridge

Login to compute node cn1 and check ifcfg-br1 and ifcfg-br2 under /etc/sysconfig/network-scripts/ like

BOOTPROTO="static"
IPADDR="60.5.106.9"
NETMASK="255.0.0.0"
NAME="br1"
ONBOOT="yes"
STP="on"
TYPE="Bridge"

Use ip addr command to check if br1, br2, eth0.6 and eth0.7.