Configuring Support for Jumbo Frames
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CLI – This example sets the MTU for Fast Ethernet ports to 1528 bytes.
Configuring Support for Jumbo Frames
The switch provides more efficient throughput for large sequential data transfers by
supporting jumbo frames up to 9216 bytes for Gigabit Ethernet. Compared to
standard Ethernet frames that run only up to 1.5 KB, using jumbo frames
significantly reduces the per-packet overhead required to process protocol
encapsulation fields. Frame sizes for Fast Ethernet ports can be extended up to
1546 bytes, and are used primarily to allow for additional header fields – not to
significantly increase the per-packet data size.
Command Usage
To use jumbo frames, both the source and destination end nodes (such as a
computer or server) must support this feature. Also, when the connection is
operating at full duplex, all switches in the network between the two end nodes must
be able to accept the extended frame size. And for half-duplex connections, all
devices in the collision domain would need to support jumbo frames.
Command Attributes
Jumbo Packet Status – Configures support for jumbo frames. (Default: Disabled)
Web – Click System, Jumbo Frames. Enable or disable support for jumbo frames,
and click Apply.
Figure 4-4 Configuring Support for Jumbo Frames
CLI – This example enables jumbo frames globally for the switch.
Console(config)#system mtu 1528 19-11
Console(config)#exit
Console#show system mtu 19-11
System MTU size is 1528 Bytes
System Jumbo MTU size is 1518 Bytes
Console#
Console(config)#jumbo frame 19-10
Console(config)#
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