Manual Chapter : Set BIG-IQ VE MTU values to pass traffic between tenant and external networks

Applies To:

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BIG-IQ Centralized Management

  • 8.0.0
Manual Chapter

Set BIG-IQ VE MTU values to pass traffic between tenant and external networks

You edit the custom configuration file so that any time the VE restarts, it sets the MTU value correctly.
  1. Access the BIG-IQ
    bash
    command shell.
    You can access this shell from the OpenStack console or you can use SSH to log in to the BIG-IQ VE.
  2. In the command shell, type the command
    sudo vim /config/startup
    .
  3. Type the user password when prompted.
    The
    config startup
    file opens for editing.
  4. Type
    I
    to enter insert (edit) mode and add either of these two commands to the end of the file:
    • ifconfig eth0 mtu 1450
    • ip link set eth0 mtu 1450
  5. Press the Esc key to exit insert mode.
  6. Type
    :w!
    and press Enter to commit changes.
  7. Type
    :q
    to exit the editor and return to the command prompt.
  8. To verify the change was saved, type
    cat /config/startup
    .
  9. To reboot the VE, type
    tmsh reboot
    .
  10. When the reboot completes, return to the command shell and type
    ifconfig eth0
    and verify that the new MTU value persists.
  11. Access the BIG-IQ
    bash
    command shell run, and then type the following commands to change the MTU value for the default route in the device route table.
    1. tmsh modify sys management-route default {mtu 1450}
    2. tmsh save sys config
  12. To verify the change, type
    ip route
    .
    This change to the local route table is persistent, so you do not need to make a change to the
    /config/startup
    file.