Cisco Systems WSC2960X48TDL Uživatelský manuál stáhnout pdf (Strana 84)

the system mtu global configuration command. You can increase the MTU size to support jumbo frames

on all Gigabit Ethernet interfaces by using the system mtu jumbo global configuration command.

•

Gigabit Ethernet ports are not affected by the system mtu command; 10/100 ports are not affected by

the system mtu jumbo command. If you do not configure the system mtu jumbo command, the setting

of the system mtu command applies to all Gigabit Ethernet interfaces.

•

Frames sizes that can be received by the switch CPU are limited to 1998 bytes, no matter what value

was entered with the system mtu or system mtu jumbo commands. Although frames that are forwarded

are typically not received by the CPU, in some cases, packets are sent to the CPU, such as traffic sent

to control traffic, SNMP, or Telnet.

If Layer 2 Gigabit Ethernet interfaces are configured to accept frames greater than the 10/100 interfaces,

jumbo frames received on a Layer 2 Gigabit Ethernet interface and sent on a Layer 2 10/100 interface are

dropped.

Note

How to Configure MTU Sizes

Configuring the System MTU

Beginning in privileged EXEC mode, follow these steps to change the MTU size for all 10/100 or Gigabit

Ethernet interfaces:

SUMMARY STEPS

configure terminal

system mtu bytes

system mtu jumbo bytes

end

copy running-config startup-config

reload

show system mtu

DETAILED STEPS

PurposeCommand or Action

Enters global configuration mode.configure terminal

Example:

Switch# configure terminal

Step 1

Catalyst 2960-X Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX

72 OL-29034-01

Configuring System MTU

How to Configure MTU Sizes

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Cisco Systems WSC2960X48TDL Uživatelský manuál Strana 84