Configuring and Administering Network Components in Oracle® Solaris 11.2

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Updated: September 2014
 
 

Enabling Support for Jumbo Frames

MTU defines the size of the largest packet that a protocol can transmit from the system. By default, most NIC drivers define the MTU size to 1500. However, if Jumbo frames are traversing the network, the default value is insufficient. Support for Jumbo frames requires the MTU size to be at least 9000.

Note -  The MTU property is common to both datalinks and IP interfaces, which means you can have one MTU value for a datalink and another MTU value for the IP interface that is configured over that link. The value of the datalink MTU impacts the possible values that you can set for an IP interface's MTU. For more information about the implications of this behavior when configuring the MTU property for datalinks and IP interfaces, see Setting the MTU Property.

Change the default value of the MTU size as follows:

# dladm set-linkprop -p mtu=new-size datalink

After changing the MTU size, you can reconfigure an IP interface over the datalink.

The following example shows how to enable support for Jumbo frames. This example assumes that you have already removed any existing IP interface configuration over the datalink.

# dladm show-linkprop -p mtu net1
LINK     PROPERTY        PERM VALUE        EFFECTIVE    DEFAULT   POSSIBLE
net1     mtu             rw   1500         1500         1500      1500

# dladm set-linkprop -p mtu=9000 net1
# dladm show-link net1
LINK     CLASS     MTU      STATE     BRIDGE     OVER
web1     phys      9000     up        --         --
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