Information about the MTU | Cisco Systems WSC2960X48TDL specs

C H A P T E R 6

Configuring System MTU

This module contains the following sections:

•Finding Feature Information, page 71

•Information about the MTU, page 71

•How to Configure MTU Sizes, page 72

•Configuration Examples for System MTU, page 73

•Additional References for System MTU, page 74

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Information about the MTU

The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces is 1500 bytes. You can increase the MTU size for all interfaces operating at 10 or 100 Mb/s 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.

System MTU Guidelines

When configuring the system MTU values, follow these guidelines:

•The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces is 1500 bytes. You can increase the MTU size for all interfaces operating at 10 or 100 Mb/s by using

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

OL-29034-01

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Cisco Systems WSC2960X48TDL manual Information about the MTU, System MTU Guidelines

Contents

First Published July 10 Americas HeadquartersPage N T E N T S Contents Configuring Auto-MDIX41 Configuring System MTU Configuring EEE Viii Bold font Document ConventionsConvention Description Reader Alert Conventions Vertical barsElement Related Documentation Obtaining Documentation and Submitting a Service Request Xii This chapter contains the following topics Information About Using the Command-Line InterfaceCommand Modes Ctrl-Z Mode Access Method Prompt Exit Method About This ModeConfigure Quit Help Using the Help SystemCommand or Action Purpose Step Mode CLI Error Messages Understanding Abbreviated CommandsNo and default Forms of Commands Error Message Meaning How to Use the CLI to Configure FeaturesConfiguration Logging Configuring the Command History Command or Action Changing the Command History Buffer SizeRecalling Commands Terminal no history Enabling and Disabling Editing FeaturesDisabling the Command History Feature Privileged Exec mode Editing Commands through Keystrokes Editing Command Lines That Wrap Show more command begin include exclude Searching and Filtering Output of show and more CommandsAccess-list Show more command begin include exclude regular-expression Command or Action Example OL-29034-01 This module contains the following topics Finding Feature InformationInformation About Configuring Interface Characteristics Interface Types Port-Based VLANs Switch Ports Trunk Ports Switch Virtual Interfaces EtherChannel Port Groups Power over Ethernet Ports USB Mini-Type B Console Port Using the Switch USB Ports USB Type a Ports Interface Connections Connecting VLANs with the Switch Interface Configuration Mode Layer 2 or switching mode switchport command VLANs 1 Default Ethernet Interface ConfigurationFeature Default Setting Speed and Duplex Configuration Guidelines Interface Speed and Duplex Mode Ieee 802.3x Flow Control Either gigabitethernet 1/0/1 How to Configure Interface CharacteristicsConfiguring Interfaces Procedure Gigabit Ethernet port 1 on switch 1 is selected Show interfaces interface-id description Configure terminalAdding a Description for an Interface Description string Interface range port-rangemacro Configuring a Range of InterfacesConfigure terminal Enters global configuration mode Define interface-range macroname Configuring and Using Interface Range MacrosVerifies the configuration of the interfaces in the range Interface range macro macroname Configuring Ethernet InterfacesSetting the Interface Speed and Duplex Parameters Nonegotiate Speed 10 100 1000 auto 10 Command or Action Purpose Configuring Ieee 802.3x Flow Control Enter interface configuration mode Configuring SVI Autostate ExcludeEnd Returns to privileged Exec mode Interface vlan vlan-id gigabitethernet interface-id Switchport autostate excludeShutting Down and Restarting the Interface An SVI line state up or down Shutdown Shuts down an interface Configuring the Console Media TypeThis configuration applies to all switches in a stack Configure terminal Line console Media-type rj45 End Configure terminal Enters the global configuration mode Configuring the USB Inactivity Timeout Show interfaces interface-id switchport Monitoring Interface CharacteristicsCommand Purpose Show interfaces interface-id status err-disabled Clearing and Resetting Interfaces and Counters Adding a Description to an Interface Example Configuration Examples for Interface CharacteristicsIdentifying Interfaces on a Stack-Capable Switch Examples Configuring a Range of Interfaces Examples Configuring the Console Media Type Example Configuring and Using Interface Range Macros ExamplesSetting Interface Speed and Duplex Mode Example None Configuring the USB Inactivity Timeout ExampleTo disable the configuration, use these commands Standards and RFCs Standard/RFC Release Modification Cisco IOS Release 15.02EX This feature was introducedTechnical Assistance Description Link OL-29034-01 This module contains the following sections Prerequisites for Auto-MDIXRestrictions for Auto-MDIX Auto-MDIX on an Interface Information about Configuring Auto-MDIXHow to Configure Auto-MDIX Configuring Auto-MDIX on an Interface Monitoring Auto-MDIX This example shows how to enable auto-MDIX on a port Example for Configuring Auto-MDIX Information about the Ethernet Management Port Prerequisites for Ethernet Management Ports Supported Features on the Ethernet Management Port Ethernet Management Port Direct Connection to a Switch Disabling and Enabling the Ethernet Management Port How to Configure the Ethernet Management Port What to Do Next Additional References Document Title Bootloader commandsRelated Topic MIBs OL-29034-01 Configuring LLDP, LLDP-MED, and Wired Location Service Lldp and Cisco Medianet Lldp and Cisco Switch StacksLldp Supported TLVs LLDP-MED Supported TLVs Wired Location Service Configuration Guidelines Default Lldp Configuration Enabling Lldp Configure terminal Lldp runLldp run Enables Lldp globally on the switch LLDP, and enter interface configuration mode Show lldp Verifies the configuration Configuring Lldp CharacteristicsLldp transmit Enables the interface to send Lldp packets Lldp receive Enables the interface to receive Lldp packets Switchconfig# lldp holdtime Command or Action Purpose Step Configuring LLDP-MED TLVs Lldp med-tlv-select Specifies the TLV to enable Lldp med-tlv-select End Copy running-config startup-config Configuration mode. The range is 1 to Configuring Network-Policy TLV Dscp dvalue none untagged Voice voice-signalingvlan vlan-idcos Show network-policy profile Verifies the configuration Configuring Location TLV and Wired Location Service Way Use one of the following Enters location information for an interface Exit Returns to global configuration modeInformation, and enter interface configuration mode Use one of the following Verifies the configuration Command or Action Purpose Example Enabling Wired Location Service on the Switch Nmsp notification interval attachment location Configuring Network-Policy TLV ExamplesNmsp enable Enables the Nmsp features on the switch Command Description Civic location OL-29034-01 System MTU Guidelines Information about the MTU Configuring the System MTU How to Configure MTU Sizes Reload Reloads the operating system Configuration Examples for System MTUShow system mtu Verifies your settings Additional References for System MTU Restrictions for PoE Configuring PoE Supported Protocols and Standards Power over Ethernet PortsInformation about PoE Class Powered-Device Detection and Initial Power Allocation Power Management Modes Power Monitoring and Power Policing Maximum Power Allocation Cutoff Power on a PoE Port Configuring a Power Management Mode on a PoE Port How to Configure PoE Never static max max-wattage Budgeting Power for Devices Connected to a PoE PortShow power inline No cdp run Optional Disables CDP Budgeting Power to All PoE ports Configure terminal No cdp run Budgeting Power to a Specific PoE Port Power inline consumption wattage Configuring Power PolicingSpecifies the physical port to be configured, and enter Power inline police actionlog errdisable Power inline police actionlog errdisable ExitShow power inline police Show errdisable recovery Configuration mode Down the port and puts the port in the error-disabled state Power inline police action log-Generates a syslog messageWhile still providing power to the port Budgeting Power Example Monitoring Power StatusConfiguration Examples for Configuring PoE EEE Overview Information About EEE Restrictions for EEE How to Configure EEEDefault EEE Configuration EEE is disabled by default Monitoring EEE Specifies the interface to be configured, and enterPower efficient-ethernet auto Command This example shows how to disable EEE for an interface Configuration Examples for Configuring EEEThis example shows how to enable EEE for an interface Feature History and Information for Configuring EEE OL-29034-01 D E PoE