Dell PowerConnect 8100 CLI Reference Guide - Page 1061
ip mtu, Syntax, Parameter Description, Default Configuration, Command Mode, User Guidelines
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ip mtu Use the ip mtu command in Interface Configuration mode to set the IP Maximum Transmission Unit (MTU) on a routing interface. The IP MTU is the size of the largest IP packet that can be transmitted on the interface without fragmentation. Packets forwarded in hardware ignore the IP MTU. Packets forwarded in software are dropped if they exceed the IP MTU of the outgoing interface. Packets originated on the router, such as OSPF packets, may be fragmented by the IP stack. The IP stack uses its default IP MTU and ignores the value set using the ip mtu command. OSPF advertises the IP MTU in the Database Description packets it sends to its neighbors during database exchange. If two OSPF neighbors advertise different IP MTUs, they will not form an adjacency (unless OSPF has been instructed to ignore differences in IP MTU with the ip ospf mtuignore command). Syntax ip mtu [bytes] no ip mtu Parameter Description Parameter bytes Description Specifies the maximum transmission size of an IP frame. (Range: 68-9198) Default Configuration 1500 bytes is the default configuration. Command Mode Interface Configuration (VLAN) mode, Global Configuration mode User Guidelines Using this command in Global Configuration mode sets the IP MTU for all routing VLANs. This setting is adjusted internally when the link MTU command is issued. IP Routing Commands 1061
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