HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 228
Configuring the System MTU
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Configuring the System MTU Chapter 8 Configuring Interface Characteristics Configuring the System MTU The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces on the switch is 1500 bytes. You can increase the MTU size for all interfaces operating at 10 or 100 Mbps by using 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 jumbo mtu command. If you do not configure the system mtu jumbo command, the setting of the system mtu command applies to all Gigabit Ethernet interfaces. You cannot set the MTU size for an individual interface; you set it for all 10/100 or all Gigabit Ethernet interfaces on the switch. When you change the system or jumbo MTU size, you must reset the switch before the new configuration takes effect. 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, Telnet. Note If Gigabit Ethernet interfaces are configured to accept frames greater than the 10/100 interfaces, jumbo frames received on a Gigabit Ethernet interface and sent on a 10/100 interface are dropped. Beginning in privileged EXEC mode, follow these steps to change MTU size for all 10/100 or Gigabit Ethernet interfaces: Step 1 Step 2 Command configure terminal system mtu bytes Step 3 system mtu jumbo bytes Step 4 Step 5 Step 6 end copy running-config startup-config reload Purpose Enter global configuration mode. (Optional) Change the MTU size for all interfaces on the switch that are operating at 10 or 100 Mbps. The range is 1500 to 1998 bytes; the default is 1500 bytes. (Optional) Change the MTU size for all Gigabit Ethernet interfaces on the switch. The range is 1500 to 9000 bytes; the default is 1500 bytes. Return to privileged EXEC mode. Save your entries in the configuration file. Reload the operating system. If you enter a value that is outside the allowed range for the specific type of interface, the value is not accepted. Once the switch reloads, you can verify your settings by entering the show system mtu privileged EXEC command. This example shows how to set the maximum packet size for a Gigabit Ethernet port to 1800 bytes: Switch(config)# system jumbo mtu 1800 Switch(config)# exit Switch# reload 8-18 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide OL-8915-01
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