Chapter 4: Switching 67
Jumbo frames
Feature overview Jumbo frames are used in situations where certain applications would benefit
from using a large frame size (for example, Network File System, NFS). The
larger frame size eliminates some of the need for fragmentation, leading to
greater throughput. Studies have shown this particularly valuable on data center
servers, where the larger frame size increases the efficiency allowing the server to
process more requests.
The default maximum transmission unit (MTU) size for this switch is 1518 bytes
(1522 bytes with VLAN header). The jumbo frames feature extends the MTU
size on this switch to 9216 bytes. This switch assumes that all packets are in
Ethernet format. There is currently no standard defining support of jumbo
frames. However, any device connecting to the same broadcast domain should
support the same MTU. If not, packets sent from one device to another may have
trouble in communicating when a packet size exceeds the device with the smaller
configured MTU.
Defaults The default MTU size on all ports is 1518 bytes.
Configuration
examples
The following example sets the MTU for interface 0/5 to the largest supported
size:
For more information on the
mtu
command, see the CN1610 Network Switch CLI
Command Reference.
(CN1610) #configure
(CN1610) (Configure)#interface 0/5
(CN1610) (Interface 0/5)#mtu 9216
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