Configuring System MTU
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- Merry Butler
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1 Restrictions for System MTU, on page 1 Information About the MTU, on page 1 How to Configure MTU, on page 2 Configuration Examples for System MTU, on page 4 Additional References for System MTU, on page 5 Feature Information for System MTU, on page 5 Restrictions for System MTU When configuring the system MTU values, follow these guidelines: The device does not support the MTU on a per-interface basis. If you enter the system mtu bytes global configuration command, the command affects all the ports on the switch. Information About the MTU The default maximum transmission unit (MTU) size for payload received in Ethernet frame and sent on all device interfaces is 1500 bytes. 1
2 System MTU Value Application System MTU Value Application This table shows how the MTU values are applied. Table 1: MTU Values Configuration system mtu command ip mtu command ipv6 mtu command Standalone switch You can enter the system mtu command on a switch. The range is from 1500 to 9198 bytes. The C C, C QC, C Y4C, and C Y4C models of the Cisco Catalyst 9500 Series Switches support a range of 1500 to 9216 bytes. Use the ip mtu bytes command. The range is from 832 up to 1500 bytes. Note The IP MTU value is the applied value, not the configured value. Use the ipv6 mtu bytes command. The range is from 1280 to the system jumbo MTU value (in bytes). Note The IPv6 MTU value is the applied value, not the configured value. The upper limit of the IP or IPv6 MTU value is based on the switch configuration and refers to the currently applied system MTU value. For more information about setting the MTU sizes, see the system mtu global configuration command in the command reference for this release. How to Configure MTU Configuring the System MTU Follow these steps to change the MTU size for switched packets: SUMMARY STEPS 1. enable 2. configure terminal 3. system mtu bytes copy running-config startup-config 6. show system mtu DETAILED STEPS Step 1 enable Enables privileged EXEC mode. Enter your password if prompted. 2
3 Configuring Protocol-Specific MTU Device> enable Step 2 Step 3 configure terminal system mtu bytes Device(config)# system mtu 1900 Enters global configuration mode. (Optional) Changes the MTU size for all interfaces. Step 4 Device(config)# Returns to privileged EXEC mode. Step 5 Step 6 copy running-config startup-config Device# copy running-config startup-config show system mtu Device# show system mtu Saves your entries in the configuration file. Verifies your settings. Configuring Protocol-Specific MTU Beginning in privileged EXEC mode, follow these steps to change the MTU size for routed ports: SUMMARY STEPS 1. configure terminal 2. interface interface 3. ip mtu bytes 4. ipv6 mtu bytes copy running-config startup-config 7. show system mtu DETAILED STEPS Step 1 configure terminal Enters global configuration mode. 3
4 Configuration Examples for System MTU Step 2 Step 3 Step 4 interface interface Device(config)# interface gigabitethernet0/0 ip mtu bytes Device(config-if)# ip mtu 68 ipv6 mtu bytes Device(config-if)# ipv6 mtu 1280 Enters interface configuration mode. Changes the IPv4 MTU size (Optional) Changes the IPv6 MTU size. Step 5 Device(config-if)# Returns to privileged EXEC mode. Step 6 Step 7 copy running-config startup-config Device# copy running-config startup-config show system mtu Device# show system mtu Saves your entries in the configuration file. Verifies your settings. Configuration Examples for System MTU Configuring Protocol-Specific MTU Device(config)# interface fortygigabitethernet 0/0 Device(config-if)# ip mtu 900 Device(config-if)# ipv6 mtu 1286 Device(config-if)# Configuring the System MTU Device(config)# system mtu 1600 Device(config)# exit 4
5 Additional References for System MTU Additional References for System MTU Related Documents Related Topic For complete syntax and usage information for the commands used in this chapter. Document Title See the Interface and Hardware Commands section in the Command Reference (Catalyst 9500 Series Switches) MIBs MIB All the supported MIBs for this release. MIBs Link To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: Technical Assistance Description The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. Link Feature Information for System MTU Release Cisco IOS XE Everest a Modification This feature was introduced. 5
6 Feature Information for System MTU 6
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