User guide

E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
5-5
J
UMBO
F
RAMES
J
UMBO
F
RAMES
Jumbo frames are Ethernet frames that are larger than 1523 bytes, including four bytes
used for the cyclic redundancy check (CRC). Extreme products that use the “i” chipset
support switching and routing of jumbo frames at wire-speed on all ports.
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 switch does not perform IP fragmentation, or
participate in MTU negotiation on behalf of devices that do not support jumbo frames.
E
NABLING
J
UMBO
F
RAMES
To enable jumbo frame support, you must configure the maximum MTU size of a jumbo
frame that will be allowed by the switch. To set the maximum MTU size, use the
following command
config jumbo-frame size <jumbo_frame_mtu>
restart ports <portlist> Resets autonegotiation for one or more ports by
resetting the physical link.
show ports {<portlist>} collisions Displays real-time collision statistics.
show ports {<portlist>} configuration Displays the port configuration.
show ports {<portlist>} info {detail} Displays detailed system-related information.
show ports {<portlist>} packet Displays a histogram of packet statistics.
show ports {<portlist>} qosmonitor Displays real-time QoS statistics.
show ports {<portlist>} rxerrors Displays real-time receive error statistics.
show ports {<portlist>} stats Displays real-time port statistics.
show ports {<portlist>} txerrors Displays real-time transmit error statistics.
show ports {<portlist>} utilization Displays real-time port utilization information. Use
the [Spacebar] to toggle between packet, byte,
and bandwidth utilization information.
unconfig ports <portlist> display-string
<string>
Clears the user-defined display string from a port.
Table 5- 1: Summit Switch Port Commands (continued)
Command Description