How to Configure Virtual Network and Virtual Switch Devices to Use Jumbo Frames

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For Oracle Solaris 11.4, see Chapter 1, About Using Rights to Control Users and Processes in Securing Users and Processes in Oracle Solaris 11.4.

Determine the value of MTU that you want to use for the virtual network.

You can specify an MTU value up to 16000 bytes. The specified MTU must match the MTU of the physical network device that is assigned to the virtual switch.

Use the ldm list-netdev -l command to obtain the MTU value of the physical network device.

primary# ldm list-netdev -l -o net0 primary

DOMAIN
primary

NAME CLASS   MEDIA  STATE  SPEED OVER LOC
---- -----   -----  -----  ----- ---- ---
net0 PHYS    ETHER  up     1G    igb0 /SYS/RIO/NET0
     [/pci@400/pci@1/pci@0/pci@2/network@0]
     MTU       : 1500 [60-9216]
     IPADDR    : 10.129.68.118/255.255.255.0
               : fe80::210:e0ff:fe0e:e0c0/ffc0::
               : 2606:b400:418:17b2:210:e0ff:fe0e:e0c0/ffff:ffff:ffff:ffff::
     MAC_ADDRS : 00:10:e0:0e:e0:c0

Specify the MTU value of a virtual switch device or virtual network device.
Do one of the following:
- Enable jumbo frames on a new virtual switch device in the service domain by specifying its MTU as a value of the mtu property.
```
primary# ldm add-vsw net-dev=device mtu=value vswitch-name ldom
```
  In addition to configuring the virtual switch, this command updates the MTU value of each virtual network device that will be bound to this virtual switch.
- Enable jumbo frames on an existing virtual switch device in the service domain by specifying its MTU as a value of the mtu property.
```
primary# ldm set-vsw net-dev=device mtu=value vswitch-name
```
  In addition to configuring the virtual switch, this command updates the MTU value of each virtual network device that will be bound to this virtual switch.

Example 13-13 Configuring Jumbo Frames on Virtual Switch and Virtual Network Devices

The following example shows how to add a new virtual switch device that uses an MTU value of 9000. This MTU value is propagated from the virtual switch device to all of the client virtual network devices.

First, the ldm add-vsw command creates the virtual switch device, ldg1-vsw0, with an MTU value of 9000. Note that the network device net0 is specified as a value of the net-dev property.

primary# ldm add-vsw net-dev=net0 mtu=9000 ldg1-vsw0 ldg1

Next, the ldm add-vnet command adds a client virtual network device to this virtual switch, ldg1-vsw0. Note that the MTU of the virtual network device is implicitly assigned from the virtual switch to which it is bound. As a result, the ldm add-vnet command does not require that you specify a value for the mtu property.

primary# ldm add-vnet vnet01 ldg1-vsw0 ldg1

Depending on the version of the Oracle Solaris OS that is running, do the following:

Oracle Solaris 11 OS: Use the ipadm command to view the mtu property value of the primary interface.

# ipadm show-ifprop -p mtu net0
IFNAME PROPERTY PROTO PERM CURRENT PERSISTENT DEFAULT POSSIBLE
net0   mtu      ipv4  rw   9000    -- 	      9000    68-9000

The ipadm command creates the virtual network interface in the guest domain, ldg1. The ipadm show-ifprop command output shows that the value of the mtu property is 9000.

ldg1# ipadm create-ip net0
ldg1# ipadm create-addr -T static -a 192.168.1.101/24 net0/ipv4
ldg1# ipadm show-ifprop -p mtu net0
IFNAME PROPERTY PROTO PERM CURRENT PERSISTENT DEFAULT POSSIBLE
net0   mtu      ipv4  rw   9000    --         9000    68-9000

Oracle Solaris 10 OS: The ifconfig command creates the virtual network interface in the guest domain, ldg1. The ifconfig vnet0 command output shows that the value of the mtu property is 9000.

ldg1# ifconfig vnet0 plumb
ldg1# ifconfig vnet0 192.168.1.101/24 up
ldg1# ifconfig vnet0
vnet0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 9000 index 4
        inet 192.168.1.101 netmask ffffff00 broadcast 192.168.1.255
        ether 0:14:4f:f9:c4:13

Example 13-14 Changing the MTU Value of a Network Interface

The following example shows how to change the MTU value of the network interface to 4000.

Note that the MTU of an interface can only be changed to a value that is less than the MTU of the device that is assigned by the Logical Domains Manager. This method is useful when VLANs are configured and each VLAN interface requires a different MTU.

Oracle Solaris 11 OS: Use the ipadm command.

primary# ipadm set-ifprop -p mtu=4000 net0
primary# ipadm show-ifprop -p mtu net0
IFNAME PROPERTY PROTO PERM CURRENT PERSISTENT DEFAULT POSSIBLE
net0   mtu      ipv4  rw   4000    --         9000    68-9000

Oracle Solaris 10 OS: Use the ifconfig command.

primary# ifconfig vnet0 mtu 4000
primary# ifconfig vnet0
vnet0: flags=1201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS,FIXEDMTU>
mtu 4000 index 4
        inet 192.168.1.101 netmask ffffff00 broadcast 192.168.1.255
        ether 0:14:4f:f9:c4:13