Extreme Networks ExtremeWare XOS 11.0, Command Reference Manual

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configure jumbo-frame size
ExtremeWare XOS 11.0 Command Reference Guide 183
configure jumbo-frame size
configure jumbo-frame size <framesize>
Description
Sets the maximum jumbo frame size for the switch chassis.
Syntax Description
Default
Jumbo frames are disabled by default. The default size setting is 9216.
Usage Guidelines
Jumbo frames are used between endstations that support larger frame sizes for more efficient transfers
of bulk data. Both endstations involved in the transfer must be capable of supporting jumbo frames.
The
framesize
keyword describes the maximum jumbo frame size “on the wire,” and includes 4 bytes
of cyclic redundancy check (CRC) plus another 4 bytes if 802.1Q tagging is being used.
To enable jumbo frame support, you must configure the maximum transmission unit (MTU) size of a
jumbo frame that will be allowed by the switch.
Some network interface cards (NICs) have a configured maximum MTU size that does not include the
additional 4 bytes of CRC. Ensure that the NIC maximum MTU size is at or below the maximum MTU
size configured on the switch. Frames that are larger than the MTU size configured on the switch are
dropped at the ingress port.
NOTE
You must enable jumbo frames on selected ports to use the VMAN feature. Refer to Chapter 5 of the
ExtremeWare XOS Concepts Guide Software Version 11.0 for more information on configuring VMANs.
Example
The following command configures the maximum MTU size of a jumbo frame size to 5500:
configure jumbo-frame size 5500
History
This command was first available in ExtremeWare XOS 10.1.
framesize Specifies a maximum transmission unit (MTU) size for a jumbo frame.
The range is 1523 to 9216.