SMC Networks SMC TigerAccess SMC7824M/FSW - Manual (Page 382)

S
YSTEM
M
ANAGEMENT
C
OMMANDS
19-12
System MTU Commands
This section describes commands used to configure the Ethernet frame
size on the switch.
jumbo frame
This command enables support for extended frame sizes on Fast Ethernet
and Gigabit Ethernet ports. Use the no form to disable it.
Syntax
[no] jumbo frame
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
• This switch provides more efficient throughput for large sequential
data transfers by supporting jumbo frames on Gigabit Ethernet ports
of up to 9216 bytes. Compared to standard Ethernet frames that run
only up to 1.5 KB, using jumbo frames for local Gigabit Ethernet
connections 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. These Fast Ethernet
extended fames and are more often called “baby jumbo frames.”
Table 19-5 Frame Size Commands
Command Function Mode Page
jumbo frame Enables support for jumbo frames GC 19-12
system mtu Sets the maximum transfer unit GC 19-13
show system mtu Shows the maximum transfer unit size for
Fast Ethernet and Gigabit Ethernet ports GC 19-14