In contrast to the 9000 byte jumbo frames provided in IXS and IXA attached servers, virtual Ethernet in systems attached by an iSCSI network defaults to a smaller frame size that can be transported in a standard 1500 byte Ethernet frame.
If the iSCSI network is capable of a larger frame size, you can configure virtual Ethernet to use a larger size up to 9000 bytes, which improves performance. In a complex iSCSI network, there may be a mix of maximum frame sizes depending on the network topology and equipment involved.
See the following topics for information about MTU configuration:
