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:

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

To display an interface mtu:

vsr> show state / vrf main interface physical eth0
physical eth0
        address fe80::dced:1ff:fec4:3a04/64
    mtu 2000
    port pci-b0s4
        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
        mac-address de:ed:01:c4:3a:04
    oper-status UP
    enabled true

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

vsr> show config xml absolute vrf main interface physical eth0
<config xmlns="urn:6wind:vrouter">
    <interface xmlns="urn:6wind:vrouter/interface">

See also

The command reference for details.