Dell Force10 Z9000 FTOS Command Line Reference Guide for the Z9000 System FTOS - Page 791
ip mtu
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ip mtu Set the IP MTU (frame size) of the packet transmitted by the RPM for the line card interface. If the packet must be fragmented, FTOS sets the size of the fragmented packets to the size specified in this command. E-Series, S4810 Syntax Parameters ip mtu value To return to the default IP MTU value, use the no ip mtu command. value Enter the maximum MTU size if the IP packet is fragmented. The range is 576 to 9234. The default is 1500 bytes. Defaults Command Modes Command History 1500 bytes INTERFACE (Gigabit Ethernet and 10 Gigabit Ethernet interfaces) Version 8.3.7.0 Version 8.1.1.0 pre-Version 6.1.1.0 Introduced on the S4810. Introduced on the E-Series ExaScale. Introduced on the E-Series. Usage Information When you enter the no mtu command, FTOS reduces the ip mtu value to 1536 bytes. To return the IP MTU value to the default, use the no ip mtu command. You must compensate for Layer 2 header when configuring link MTU on an Ethernet interface or FTOS may not fragment packets. If the packet includes a Layer 2 header, the difference between the link MTU and IP MTU (the ip mtu command) must be enough bytes to include for the Layer 2 header. Link MTU and IP MTU considerations for Port Channels and VLANs are as follows Port Channels: • All members must have the same link MTU value and the same IP MTU value. • The Port Channel link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the channel members. For example, if the members have a link MTU of 2100 and an IP MTU 2000, the Port Channel's MTU values cannot be higher than 2100 for link MTU or 2000 bytes for IP MTU. VLANs: • All members of a VLAN must have same IP MTU value. • Members can have different Link MTU values. Tagged members must have a link MTU 4 bytes higher than untagged members to account for the packet tag. • The VLAN link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the VLAN members. For example, the VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged members with Link MTU of 1518 and IP MTU of 1500. The VLAN's Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes. The following describes the difference between Link MTU and IP MTU. 791
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