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(1) Setting fixed MDI
Points to note
To configure MDI-X to always be used instead of automatic MDIX, disable automatic
MDIX for the port.
The following shows a configuration example for a Fastethernet port.
Command examples
1.
(config)# interface fastethernet 0/24
Specifies the setting for port 0/24.
2.
(config-if)# no mdix aut
(config-if)# exit
Disables the automatic MDIX functionality so that MDI-X is always selected.
13.2.9 Using jumbo frames
The maximum transmission unit (MTU) in the Ethernet interface standard is 1500 octets.
On the Switch, the MTU can be extended by using jumbo frames to increase the amount of
data that is transmitted at one time, which improves throughput.
For a port to send or receive jumbo frames, an MTU must be set. When an MTU is set, the
Switch can send or receive frames whose maximum size is the specified MTU plus the size
of one VLAN tag.
Determine the port MTU value appropriate for the network and remote device.
(1) Setting MTU for a port
Points to note
If you set the MTU of port 0/10 to 8192 octets, jumbo frames without VLAN tags up to
8206 octets and jumbo frames with VLAN tags up to 8210 octets can be sent and
received.
The following shows a configuration example for a Fastethernet port.
Command examples
1.
(config)# interface fastethernet 0/10
(config-if)# shutdown
(config-if)# mtu 8192
Sets the MTU of port 0/10 to 8192 octets.
2.
(config-if)# no shutdown
(config-if)# exit
Notes
Even if the MTU for each port is set by using a configuration command, the MTU is
fixed at 1,500 octets when a 10BASE-T or 100BASE-TX half-duplex connection is
used. This also applies when auto-negotiation results in a 10BASE-T or
100BASE-TX half-duplex connection.
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13 Ethernet
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