MTU¶

Default MTU interface is typically 1500. User can lower the value to cope with tunneling, or increase the value up to 9K to leverage jumbo support on the NIC.

To configure the MTU of the existing interface eth0 in vrf main to 2000, do:

vrouter running config# vrf main
vrouter running vrf main# interface physical eth0
vrouter running physical eth0# mtu 2000
vrouter running physical eth0# commit

To display an interface mtu:

vrouter> show state / vrf main interface physical eth0
physical eth0
    ipv6
        address fe80::dced:1ff:fec4:3a04/64
        ..
    mtu 2000
    port pci-b0s4
    counters
        in-octets 7316
        out-unicast-pkts 7
        out-octets 7316
        in-unicast-pkts 113
        in-discards 0
        in-errors 0
        out-discards 0
        out-errors 0
        ..
    ethernet
        mac-address de:ed:01:c4:3a:04
        ..
    oper-status UP
    enabled true
    ..

The same configuration can be made using this NETCONF XML configuration:

vrouter> show config xml absolute vrf main interface physical eth0
<config xmlns="urn:6wind:vrouter">
  <vrf>
    <name>main</name>
    <interface xmlns="urn:6wind:vrouter/interface">
      <physical>
        <name>eth0</name>
        <mtu>2000</mtu>
        (...)
      </physical>
    </interface>
  </vrf>
</config>